RECIPROCATING PUMP

MVSR ENGINEERING COLLEGE DEPARTMENT OF MECHANICAL ENGINEERING

MVSR ENGINEERING COLLEGE DEPARTMENT OF MECHANICAL ENGINEERING

INTRODUCTION TO THE LABORATORY

The automobile engineering laboratory mainly deals with the idea of exposing the students to five main areas. They are: 1. Exposure to various automotive lab tools.2. Exposure to servicing of various parts of automobile3. Testing the performance different types of system4. To impart knowledge of using various measuring instruments used in an automobile lab.5. To understand various tests to be carried out to ensure the quality rating of fuels and lubricants.

The laboratory experiments fully concentrate on servicing aspects of an automobile. Here the students are exposed to all the above mentioned areas which make a student to enable himself to understand the concepts of servicing and testing in detail.

General Instructions

How to use the equipment?

The students should handle following equipment and instruments only in presence of lab instructor or staff member.1. Gear box2. Steering gear box3. Rear axle4. Braking system5. Suspension system 6. Clutch and etc.

Note 1. Make a list of tools instruments and indent the same to staff before carrying out the experiment and same should be returned to staff. 2. Care should be taken that the student should handle the instrument properly and operate as per instructions given by staff.3. Suitable size spanner/screw driver, instruments and tools should be used for dismantling of given component.

Safety Precautions1. Do not start the equipment or instrument of which he operation is not known which can lead to accident as well as damage to instrument. 2. Avoid loose clothing and long unbuttoned sleeves.3. Wear shoes in the laboratory.4. At the end of practical, clean your equipment.5. Pay attention to posters displayed for dismantling procedure.

Dress CodeStudents should wear blue pant and apron along with shoes.

Standard AccessoriesSteel roll, Scale, Pencil, Calculator, text book, Observation book.

IDENTIFICATION AND APPLICATION OF LAB TOOLS

The various tools and to study the applications of each tool.

1. Screw driver: These are used to tighten or loose the screw in the machine element. The main parts of screwdrivers are, 1. Handle which is a smooth and shaped properly for good grip. It is usually made of wood on moulded plastics. 2. Blade made of hardened and tempered carbon steel or alloy steel for strength. Blades are usually rounded, though occasionally square or rectangular sections are also used. The length sizes various from 40 mm to 250 mm or even more. The ends of the blades are formed in to flared tips for turning screw by fitting in to their head slots. 3. Screwdrivers are specified according to the length of the blade and width of the tip. Normally blade length of 45mm and 300mm and tips 3mm to10mm wide are available. 2. Spanners: These are also called wrenches. These are used for tightening or loosening the nuts. These are made of high tensile or alloy steel and are drop forged & heat-treated. Their size in determined by the nuts or blots is fits. In the unified system used commonly, the spanners are marked with sign A/F followed by a number representing decimal equivalent of the nominal size across the flats of the hexagonal nuts or bolts. The following types of spanner are commonly used. 3. Ring Spanners: The ring spanners also called box spanners. The end openings completely enclosed by the nuts and the bolt heads, for which they cannot slip and cause damage. Further the end holes in some ring spanners are twelve sides, because of which they can be used in restricted spaces.4.Open-Ended Spanners: These are the most commonly used type of the spanners in the garage, although they may not be the best means of tightening or loosening the nuts. Therefore these are employed where ring spanners or socket wrenches cannot work. It is observed that spanner opening is kept at an angle with the body axis. This is done to facilitate the turning of the nut in restricted space. 5.Combination Spanners: These are on one end and have hole on the other end. Thus they are combination of open-ended and the ring spanners. Initially for loosening jammed nuts more torque is required and we use ring end, which will not slip. However after the nut is already loose, it is more convenient to further continue with the open end. 6.Socket Spanner: These types of spanners are useful in restricted spaces where common types of spanners cannot be used. Both 6&12-point socket should be included in the well-equipped tool kit. This consists of different sizes, which can be used with various types of handles. A part from handles, both electric and air operated impact wrenches are used to drive socket for speeding up the work. 7.Torque Wrench: Important nuts and bolts in automobile work have to be tightened with the specified amount of torque because excessive torque may result in there breakage while with lesser torque they will come out loose during use. This is made possible by a torque wrench. It is a specialized form of a socket spanner. 8.Wheel Nut Spanner: A number of different types of spanners are used for tightening or loosening wheel nuts. 9.Allen Wrenches: Allen keys are used on Allen screws, which have hexagonal shaped grooves in their heads.10.Pliers: Different types of pliers have been shown in figure. A plier a device mainly used gripping only and should never be used as substitute for spanners that will damage the nut by rounding off its corner. 11.Hammers: A hammer is a tool used for striking operations such as denting, bending, punching, straightening, riveting, etc. the head and the handle form the two parts of hammers. The head is made of drop forged carbon steel and has a hole for fitting the handle there in. A medium weight ball peen hammer is the one commonly used in automobile work.

12. Chisels: A common application is the tearing open of corroded nuts and bolts with a flat chisels. The main parts of a chisels are the head the body and the cutting edge or point. These are made of high carbon steel or chrome vanadium steel. Chisels should be kept sharp. These should be sharpened approximately 60 degree included angle. 13. Bench Vice: Bench vice is used to hold the component while it is worked on. This is permanently fixed on the workbench. While holding the component some soft material is placed in the vice, it is better to place some other wooden or plastic flats between the vice jaws and the components to avoid damage to the later. 14. Steel Rule: Most simple tool for measurements length is the ordinary steel rule, which is 300 mm long. It is quite satisfactory for measurement with accuracy up to 0.5mm. Besides straight edges of the steel rule or even otherwise unmarked straight edge may be used to measure surface irregularities. 15. outside Micrometer: In case of measurements where still greater accuracy is required in that place micrometer is used. External dimension of parts such as thickness, diameter are measured with the help of outside micrometer, where as internal dimensions are measured with inside micrometer. 16. Lifting Jacks:To work under the car or to change wheels, it is necessary to lift the car. For, doing this, lifting jack is use which may be mechanically or hydraulically operated. Such a jack is a standard accessory with many cars. It consists of a diamond shaped frame having a nut on one side and a sleeve on the other side. 17. Axle Stand: It is always necessary to make sure that before start working the car with axle stand. The axle is not suppurated by the jack or any other support and also it is not safe to use bricks, for supporting purpose. So axle stand is the batter way to support the weight of the vehicle.18. Vernier Caliper:Most simple tool for measurements length is the ordinary steel rule, which is 300 mm long. It is quite satisfactory for measurement with accuracy up to 0.5mm.besides straight edges of the steel rule or even otherwise unmarked straight edge may be used to measure surface irregularities. Used in hole diameter, depth of hole, outer diameter and inner diameters.

EXPT NO: 01DATE: LIGHT MOTOR AND HEAVY DUTY VEHICLE FRAME

Aim of the experiment: To study about the automobile frame and body.

Theory: FRAME The frame is the main part of the chassis on which remaining parts of chassis are mounted. The frame should be extremely rigid and strong so that it can withstand shocks, twists, stresses and vibrations to which it is subjected while vehicle is moving on road. It is also called underbody. The frame is supported on the wheels and tyre assemblies. The frame is narrow in the front for providing short turning radius to front wheels. It widens out at the rear side to provide larger space in the body.

TYPES OF FRAME There are three types of frames:(a) Conventional frame, (b) Semi-integral frame, and (c) Integral frame (or unit frme).

1. Conventional Frame It is non-load carrying frame. The loads of the vehicle are transferred to the suspensions by the frame. This suspension in the main skeleton of the vehicle which is supported on the axles through springs. The body is made of flexible material like wood and isolated frame by inserting rubber mountings in between. The frame is made of channel section or tubular section of box section.

Example: This type of frame is used for trucks.

2 Semi-integral Frame In this case the rubber mountings used in conventional frame between frame and suspension are replaced by more stiff mountings. Because of this some of the vehicle load is shared by the frame also. This type of frame is heavier in construction.

Example: All rear wheel drive cars.

3. Integral Frame or Frame-less Construction In this type of construction, there is no frame. It is also called unitized frame-body construction. In this case, the body shell and underbody are welded into single unit. The underbody is made of floor plates and channel and box sections welded into single unit. This assembly replaces the frame. This decreases the overall weight compared to conventional separate frame and body construction.

Functions of Frame

1. To support the load of body, engine, gearbox and radiator.2. To provide the connecting link for front and rear axles.3. To carry load of the passengers or goods carried in the body.4. To withstand stresses caused due to bad road conditions.5. To withstand forces caused due to a sudden braking or acceleration.6. To withstand load / force caused due to turning of vehicle.

Results: Light motor and heavy duty vehicle frames are studied.Questions:-(1) What do you mean by Chassis? Describe. (2) What are the functions of frame? (3) List various types of frame and describe in brief the conventional frame. (4) What do you mean by frameless construction? Describe in brief.(5) Differentiate between integral and semi-integral frame

EXPT NO:02DATE: FRONT AXLE

Aim of the experiment: To study, dismantle, inspect and replace the worn out parts and grease necessary parts and reassemble.

Theory: The front axle is used to carry the weight of the front part of the vehicle as well as to facilitate steering and absorb shocks due to road surface variation. It must be rigid and robust in construction. It is usually steel drop forging having 0.4% carbon steel or 1 to 3% Nickel steel. A dead axle, also called lazy axle, is not part of the drive train but is instead free-rotating. The rear axle of a front-wheel drive car may be considered a dead axle. Many trucks and trailers use dead axles for strictly load-bearing purposes. A dead axle located immediately in front of a drive axle is called a pusher axle. A tag axle is a dead axle situated behind a drive axle. On some vehicles, the axle may be steerable.

Functions: 1. It carries the hubs and the wheels. 2. It carries the weight of the front part of the vehicle. 3. It works as cushion through the spring which facilitates a comfortable ride. 4. It controls the ride through shocks absorber fitted on H. It carries the brake system. 5. It carries stub axle, king pin, Steering arm by which the vehicle steers. 6. In case of four wheel drive it also transmits power to road wheels. 7. It includes steering mechanism, braking mechanism and suspension etc..

List of equipment required to conduct the experiment with their specifications:-Equipment Front Axle

Make

Vehicle Model

Type

Tools and gauges:-Spanners (size-10 to 28 mm), Ball peen hammer, Bearing puller, hammer, Jack, and supporting wood block, metal tray.

Consumables and others: - Oil seal, Grease, kerosene, cottonwaste.

PROCEDURE: REMOVAL1. Disconnect cable from negative battery terminal 2. Remove front wheel 3. Drain brake fluid NOTICE: Immediately wash off any brake fluid that comes into contact with painted Surfaces. 4. REMOVE FRONT BRAKE ASSEMBLY (a) Remove the bolt and separate the brake tube bracket from the steering Knuckle. (b) Disconnect the brake tube from the brake cylinder. NOTICE: Use a container to catch the brake fluid as it drains out. 5. REMOVE FRONT AXLE HUB GREASE CAP (a) Using a screwdriver and a hammer, remove the front axle hub grease cap. NOTICE: Do not damage the axle hub. 6. REMOVE FRONT AXLE HUB NUT (a) Remove the cotter pin and lock cap. (b) Remove the front axle hub nut. 7. SEPARATE FRONT STABILIZER LINK ASSEMBLY (a) Remove the nut and separate the stabilizer link from the steering knuckle. HINT: If the ball joint turns together with the nut, use a hexagon (6 mm) wrench to hold the stud. 8. SEPARATE TIE ROD END SUB-ASSEMBLY (a) Remove the cotter pin and nut. (b) Separate the tie rod end from the steering knuckle. 9. REMOVE FRONT AXLE HUB (a) Using a plastic hammer, separate the front axle hub from the front drive Shaft. (b) Remove the front axle hub. DISASSEMBLY: 1. REMOVE KNUCKLE GREASE RETAINER CAP (a) Using a screwdriver and hammer, remove the knuckle grease retainer cap. 2. REMOVE FRONT AXLE HUB OIL SEAL (a) Using a screwdriver and hammer, remove the front axle hub oil seal. 3. REMOVE FRONT WHEEL ADJUSTING NUT (a) Using a hammer, unstake the front wheel adjusting nut. (b) Remove the front wheel adjusting nut. 4. REMOVE FRONT AXLE HUB (a) Remove the 4 bolts and axle hub from the steering knuckle. (b) Remove the O-ring from the axle hub.Part List:-

Part IDNameMaterialQuantity

Assembly: Follow the disassembly steps in reverse order by assembling each component Results:- Front axle is dismantled; inspected and necessary parts are replaced then reassembled.

Conclusions:

Viva questions:1. Types of materials used for their construction.2. Distinguish clearly between live axle and dead axle. 3. Recognize the various components of the front axle.

EXPT NO:03DATE:REAR AXLE

Aim of the experiment: To study, dismantle, inspect and replace the worn out parts and grease necessary parts and reassemble the rear axle.

Theory: Rear axles are used to transmit power to the wheels and takes drive from the differential .It is also called as final drive. The rear axle always carries complete vehicle load hence the regular maintenance of rear axle is very important factor. The wear and tear of axle bearings, chuck nuts and wear and tear of rear half axle & its splines are the major problems found in this system, due to lack of maintenance. Hence it is required to carry out regular maintenance at regular time of interval as recommended by the manufacturer in his chart.

Functions:As the rear axle is suspended from the body of the vehicle by leaf springs attached to the axle housing. The rear axle performs several functions which are as under.

1. Changing the direction of driveshaft rotation by 90 degrees to rotate the axle shafts. 2. Providing a final speed reduction between the drive shaft and the axle shafts through the final drive gears or differential gears. 3. Providing differential action, so that one wheel can turn at a different speed as compared to the both wheel, when required, 4. Providing axle shafts or half shafts to drive the rear wheels. 5. Acting as a thrust and torque reaction member during acceleration and breaking.

List of equipment required to conduct the experiment with their specifications:-Equipment Rear Axle

Make

Vehicle Model

Type

Tools and gauges:-Spanners (size-10 to 28 mm), Ball peen hammer, Bearing puller, Jack, and supporting wood block, metal tray.Consumables and others: Oil seal, Grease, kerosene, cottonwaste.

PROCEDURE: 1) Loosen the bolts of the rear half axle hub cover plate.2) Remove the cover plate without damaging the cover plate hub packing.3) With the help of wooden hammer tap the rear half axle which is present inside the hub by tapping it will come out side.4) Remove the half axle and wash it in cleaned kerosene. 5) Check the condition of the half axle gear teeths and splines on the axle shaft.6) If the gear teeths fond damaged and splines were worn out then, replace the axle shaft.7) Remove the check nut with the help of check nut spanner.8) Remove the drum with Hub.10) With the help of bearing puller remove the hub bearings.11) Wash the Hub and hub bearings in cleaned kerosene, with cotton waste make it dry12) Check the bearings and if the balls or cone of the bearing is found damaged then replace the bearings.13) Grease the hub and bearings with recommended bearing grease.14) Remove the old oil seal from hub shaft.15) Clean the hub shaft with kerosene and make it dry with cotton waste.16) Fit the new oil seal on the hub to the big end side of the bearing.17) Clean the drum inside portion with sand paper.18) Check the brake liners for wear and tear if necessary replace it.19) Fit the drum and hub on the hub shaft.20) Tighten the chuck nut on hub shaft.21) Fit the half axle and Fix the hub cover plate and tighten the bolts.Part List:-Part IDNameMaterialQuantity

Results: Rear axle is dismantled, inspected and replaced the necessary parts, reassembled.

Conclusions:

Viva questions:1. List out components in rear axle2. Classify the types of rear axles3. Justify its working principle based on its construction.

EXPT NO: 04DATE:DIFFERENTIAL

Aim of the experiment: Dismantling, Inspection, Assembly of Differential & Calculation Final drive and differential gear ratios.Theory: Differential gear box is used to provide the difference in speed of the driving wheels, when the vehicle is steered on a curve. Because the distance traversed by the outer wheels will be more than the inner wheels. It is also important that the clearance between the mesh teethes should be maintained properly. The differential consists of a system of gear arranged in such a way that connect the propeller shaft with the rear axle. The purpose of the differential is to provide the relative movement of the two rear axle wheels when the vehicle is taking turn.

Final reduction = No of teeth on crown wheel No of teeth on the pinion

List of equipment required to conduct the experiment with their specifications: -Equipment: - Differential

Vehicle Make

Vehicle Model

Type of Differential

Tools and gauges: Box spanner, double ended spanners, hammer. Consumables and others: - SAE 90 oil, kerosene, cotton waste.

PROCEDURE: 1) Open the differential cover by using double-ended spanners.2) Remove the check nut and keep them aside.3) Remove the pinion shaft from the assembly.4) Remove the crown from the assembly.5) Dismantle the bevel gear arrangement consisting of sun wheel and planet wheels.6) Inspect all the wear & tear.7) If necessary replace the worn out parts.8) Check the bearings for proper functioning if worn out replace it.9) Grease & Lubricate all the necessary parts.10) Resemble it in the descending order and check for proper functioningObservations:Si NoNo of teeth on pinionNo of teeth on crown wheelGear reduction ratio

01

Specimen calculation:

Final reduction = No of teeth on crown wheel No of teeth on the pinion

Part List:-

Part IDNameMaterialQuantity

Results: Thus the given differential unit is dismantled, overhauled, reassembled and adjusted for backlash, correct teeth contact of crown and pinion.

Conclusions:

Viva questions:1. Explain the working of differential gear2. List out the components of differential gear box3. What are the different types of drives used in automobiles?4. Differentiate gear ratios for light and heavy motor vehicles

EXPT NO: 05DATE:STEERING SYSTEMS (Rack and Pinion)

Aim of the experiment: To dismantle, inspect the construction, working and reassemble thesteeringgear mechanism.

Theory: The main function of the steering mechanism is to steer the vehicle to the left or right as desired. According to vehicle type, its load capacity, design of the steering mechanism changes with vehicle to vehicle. There are number of steering gear boxes including worm & roller, re-circulating ball type steering mechanism, rack & pinion. Worm & gear type aremainly used in Indian vehicles.

List of equipment required conducting the experiment with their specifications: Equipment:-Model

Make

Type

Tools and gauges:- Spanners (size- 6 to 22 mm), Ball peen hammer, Wooden hammer, Screwdriver (size 100 to 250 mm), Combination pliers,

Consumables and others: - Bearing Grease, steering gear oil, diesel, cotton

Part List:-

Part IDNameMaterialQuantity

PROCEDURE: 1. Dismantle the ball joints from the steering knuckle 2. Remove the dust covers and dismantle the rods3. Dismantle the pinion4. Pull the rack from the steering housing.

Results: The steering gear box (Rack and Pinion) dismantled, inspected and reassembled inreverse order.

Conclusions:

EXPT NO.06DATE:STEERING GEAR BOX (RECIRCULATING BALL TYPE)

Aim of the experiment: To dismantle, inspect the construction, working and reassemble thesteeringgear mechanism.

Theory: The main function of the steering mechanism is to steer the vehicle to the left or right as desired. According to vehicle type, its load capacity, design of the steering mechanism changes with vehicle to vehicle. There are number of steering gear boxes including worm & roller, re-circulating ball type steering mechanism, rack & pinion. Worm & gear type aremainly used in Indian vehicles.

List of equipment required conducting the experiment with their specifications: Equipment:-Model

Make

Type

Tools and gauges:-Spanners (size- 6 to 22 mm), Ball peen hammer, Wooden hammer, Screwdriver (size 100 to 250 mm), Combination pliers.

Consumables and others: - Bearing Grease, steering gear oil, diesel, cotton waste.

PROCEDURE:1. Loose the steering wheel nut and pull out the steering wheel with the help of steering puller.2. Loosen the lock on the sector shaft.3. Drain all the oil from the steering gear box.4. Remove the sector shaft at the bottom of the steering column.5. Draw out the worm shaft and nut assembly from the casing6. Lay the assembly in tray on the bench to prevent the nut assembly from coming out of the worm shaft7. Remove the lock from lock adjuster and unscrew the lash adjuster8. If the sector shaft is worn out then replace new parts and retain in position9. Clean out face movement of worm after replacing it into the casing 10. Refit it in the reverse direction.

Part List:-Part IDNameMaterialQuantity

Results: The steering gear mechanism is dismantled, inspected and reassembled inreverse order.

Conclusions:

EXPT NO:07DATE:STEERING GEAR BOX (WORM AND ROLLER TYPE)

Aim of the experiment: To dismantle, inspect the construction, working and re assemble the steering gear mechanism.

List of equipment required to conduct the experiment with their specifications:-Equipment- Steering gear box

Vehicle Make

Vehicle Model

Type of steering gear box

Tools and gauges:-Spanners (size-6 to 22mm), ball peen hammer, wooden hammer, screw driver, combination pilers.Consumables and others: - Bearing grease, steering gear oil, diesel, cotton waste.

PROCEDURE: 1) Loosen the lock on sector shaft.2) Drain all oil from steering gear box.3) Remove the sector shaft at the bottom of steering column.4) Draw out the worm shaft and nut assembly from casing.5) Lay the assembly in a tray on the bench to prevent nut assembly to come of worm shaft.6) Remove the lock from lock adjuster and unscrew the last adjuster.7) If the sector shaft is worn out, then replace new parts and retain in position.8) Clean out face movement of worm after replacing it into the casing.9) Refit it in reverse order. Results: The steering gear mechanism is dismantled inspected and re-assembled in reverse order.

Conclusions:

EXPT NO:08 DATE:BRAKING SYSTEMS

Aim of the experiment: To study and prepare report on the constructional details, working principles and operation of the Automotive Brake systems.

Apparatus: Models of(a) Hydraulic & Pneumatic Brake systems.(b) Drum Brake System.(c) Disk Brake System.

Theory: (a) Constructional details, working principles and operation of the Hydraulic & Pneumatic Brake systems:The Hydraulic brake system is a braking system which uses brake fluid usually includes ethylene glycol, to transmit pressure from the controlling unit, which is usually near the driver, to the actual brake mechanism, which is near the wheel of the vehicle. The most common arrangement of hydraulic brakes for passenger vehicles, motorcycles, scooters, and mopeds, consists of the following: Brake pedal or Brake lever,Pushrod also called an actuating rod,Reinforced hydraulic lines Rotor or a brake disc or a drum attached to a wheel, Master cylinder assembly includes: Piston assembly is made up of one or two pistons, a return spring, a series of gaskets or O-rings and fluid reservoir.Brake caliper assembly usually includes: One or two hollow aluminum or chrome-plated steel pistons called caliper pistons and set of thermally conductive brake pads.

Pneumatic or Air Brake System is the brake system used in automobiles such as buses, trailers, trucks, and semi-trailers. The Compressed Air Brake System is a different air brake used in trucks which contains a standard disc or drum brake using compressed air instead of hydraulic fluid. The compressed air brake system works by drawing clean air from the environment, compressing it, and hold it in high pressure tanks at around 120 PSI. Whenever the air is needed for braking, this air is directed to the functioning cylinders on brakes to activate the braking hardware and slow the vehicle. Air brakes use compressed air to increase braking forces.

(b) Constructional details, working principles and operation of the Drum Brake System:Drum brakes consist of a backing plate, brake shoes, brake drum, wheel cylinder, return springs and an automatic or self-adjusting system. When you apply the brakes, brake fluid is forced under pressure into the wheel cylinder, which in turn pushes the brake shoes into contact with the machined surface on the inside of the drum. When the pressure is released, return springs pull the shoes back to their rest position. As the brake linings wear, the shoes must travel a greater distance to reach the drum. When the distance reaches a certain point, a self-adjusting mechanism automatically reacts by adjusting the rest position of the shoes so that they are closer to the drum.

(c) Constructional details, working principles and operation of the Disk Brake System:The disk brake is the best brake we have found so far. Disk brakes are used to stop everything from cars to locomotives and jumbo jets. Disk brakes wear longer, are less affected by water, are self adjusting, self cleaning, less prone to grabbing or pulling and stop better than any other system around. The main components of a disk brake are the Brake Pads, Rotor, Caliper and Caliper Support.

Results: Different braking system with their constructional details are studied

Conclusions:

Viva questions:

1. How to prevent accidents with good braking system.2. Compare the different brakes with their constructional details.3. Comment on the possible causes for brakes failures.

EXPT NO: 09DATE:SUSPENSION SYSTEMS

LEAF AND COIL SPRING

Aim of the experiment: To dismantle, inspect and assemble of leaf and coil spring

Theory: Whenever an automobile pass over a bump (or) a dig on a road, the vehicle gets damped if shocks get transmitted to the frame from the wheels. To avoid the shocks from passing to frame, suspension system is used.

Observations and Calculations:Leaf Spring No.Leaf Spring Length(in inches)

1

2

3

4

5

6

7

8

Equipment: leaf and coil spring assembly

Tools and gauges: Spanner sets, Screw jack, springer holder.

Consumables and others:-Cotton waste, diesel (or) lubricant.

PROCEDURE:

DISMANTLING AND ASSEMBLING OF LEAF SPRING:

1. Jack up the vehicle using screw jack. Horse stand is placed under the axle for support.2. The leaf spring assembly is removed from the chassis by loosing the bolts at two ends and U bolt.. Remove the shackle, bush, pin.

3. All clips are removed. The spring plates are inspected separately for any breakage.4. Due to continuous use, the spring assembly gets sagged or gets straightened. 5. Under these circumstances, the spring plate is hammered throughout is length by placing on a special fixture which will give designed cure. This operation is called re-cambering of spring. 6. Proper lubricant is applied and then all springs are assembled. 7. When the shape of spring is different from one another, the opposite Spring must also be re-cambered.

COIL SPRING:

Dismantling and assembling of coil spring:

1. Jack up the vehicle. The wheels are removed. 2. The shock absorber is removed. 3. Now, the upper and lower wish bone arms are free and so, the coil spring can be removed easily.4. The coil spring is tested on compressive load, if change in length is found; its deviated from the manufactures specification. Spring is replaced with new one5. Rubber pad is checked for any damage. Then refit the coil spring in Vehicle.

Result: Thus the Leaf and Coil spring is dismantled inspected and assembled.

Conclusions:

Viva questions:1. Discuss about the suspension system, relate the importance of a good suspension system.2. List out the components of different types of suspension system.3. Bring out the modifications and advances being employed in suspension systems.4. Judge and discuss the suitability of a suspension system based on the type of vehicle.

EXPT NO:10 DATE:DISMANTLING AND ASSEMBLY OF SHOCK ABSORBERAim of the experiment: To remove and refit of shock absorber in given vehicle

Theory: The hydraulic shock absorber provides its dampening action by transferring oil, under pressure, through valves which restrict the oil flow.

Tools and gauges: Spanner sets, Screw jack, spring holder.

Procedure: 1. Screw jack is placed under the vehicle. 2. Jack up the vehicle. 3. Loosen the top and bottom bolts of shock absorber. 4. Remove the shock absorber from the suspension. 5. Clean the rubber bush and outer surface. 6. The bottom eye is fixed, and the top eye is pulled and pushed several times. 7. Tightness must be felt 8. When there is true motion that the shock absorber is unfit for further use. So, a new shock absorber of same capacity must be refitted.

Result: Thus the shock absorber is removed, checked and refitted.

Conclusions:

Viva questions:1. List out the components of shock absorber2. Bring out the modifications and advances being employed in suspension systems.3. Judge and discuss the suitability of a suspension system based on the type of vehicle.

EXPT NO:11DATE:CLUTCH ASSEMBLY

Aim of the experiment: To dismantle, inspect and assemble the given clutch assembly.

Description: Basically the clutch consists of three parts. These are flywheel, friction disc, and Pressure plate. When engine is running, the flywheel and pressure plate rotate. The clutch plate is placed between flywheel and pressure plate. When the driver operates the clutch pedal the pressure plate along with the clutch plate moves away making a gap in between them and there is no power transmitted from the flywheel to the gearbox. When the driver releases the clutch pedal, power is transmitted through the clutch springs, forces the pressure the plate against the friction disc. The action clamps the friction disc tightly between the flywheel and pressure plate. Now the pressure plate and friction disc rotate with flywheel .The friction disc is assembled on the splined shaft that carries the rotary motion to the gearbox.

Sequence of steps to be followed for assembly of clutch.1. Identification of fasteners 2. Identification of sub assembly 3. Identification of principal functional parts

Equipment Clutch Assembly

Vehicle Make

Vehicle Model

Type of clutch

Tools and gauges: Spanners (size-6 to 22mm), combination pliers, screwdriver (medium size)Consumables and others: - sandpaper, cotton waste.

Part List:-

Part IDNameMaterialQuantity

Procedure: 1) Loosen the clutch-housing nut.2) Remove the clutch assembly and lay on the ground.3) Loosen the nut of pressure plate assembly.4) Inspect the spring tension, if worn replace it.5) Inspect the wear and tear of friction disc if, worn out replace it.6) Inspect the release lever and release bearing for wear and tear.7) Check cracks, uneven wear on pressure plate if necessary replace it.8) After inspecting all the parts, replace the necessary parts.9) Assemble all clutch assembly in reverse order. 10) Inspect clutch assembly for correct operation.

Result: Clutch assembly is dismantled, cleaned checked for visual damages and reported the problems.

Conclusions:

Viva questions:1. List out different types of clutches used in automobiles.2. How the clutches are working and the power transmission done in the engine 3. Identify the various components of clutch. 4. Explain operations of different clutches.

EXPT NO:12DATE:GEAR BOX (Sliding Mesh)

Aim of the experiment: Dismantling, inspection and assembling of gear box and to calculate gear ratio.

Theory: An obsolete type of transmission or gearbox in which the gears on the lay shaft are fixed to the shaft rigidly, whereas the gears on the main shaft can slide on it by means of splines but are otherwise in permanent rotational mesh with the shaft.

Formula:Gear ratio=No of teeth on driven gear/No of teeth on driving gear

Equipment- Constant Mesh Gear Box

Vehicle Make

Vehicle Model

Tools and gauges:Set of open end spanner (6-28mm), screw drivers (size-150,250mm)Consumables and others: - kerosene, cotton waste.

Procedure: 1) Loosen the gear box, drain plug and drain the oil.2) With the help of spanner, Loosen top cover bolts.3) Take out the clutch shaft and bearing by tapping method for gear box.4) Take out the main shaft and gears, keep in tray.5) Take out the lay shaft and idler shaft.6) Wash all parts in kerosene, clean and dry with compressed air.7) Arrange all parts in correct order.8) Inspect the parts for failure.9) If necessary, replace the rubber bush.10) Assemble the gear box and check for operation.Observations:1) No. of speeds2) No of teeth on pinion, fixed to clutch shaft3) No of teeth on counter gear connected with pinion shaft4) Total no of shafts

Results: The gear ratio is and the parts are dismantled, inspected and replaced.

Conclusions:

Viva questions:1. Why gear box is used in a vehicle.2. Discus the advantages of constant mesh gearbox over sliding mesh gearbox. 3. Explain the common troubles uncounted in gear boxes and suggest Suitable remedies.4. What is synchromesh device?5. What may be the possible reason when the gear slips out of engagement?6. What should be the cause when the vehicle is running with excessive noise in the gear box?

EXPT NO:13DATE:CONSTANT MESH GEAR BOX

Aim of the experiment: To dismantle, inspect and assemble the given Constant mesh gear box and finding out the gear ratioTheory: In constant mesh gear box all the gears are always in mesh and the engagement between the gears which are freely rotating on thetransmissionmain shaft and thetransmissionmain shaft is effected by moving the dog clutches.

Tools required: Spanner size (6 to 22 mm), combination pliers, screw drivers, sand paper, cotton waste.

A - Clutch shaft gear wheel H,G,F& K - Main shaft gear wheel B, C, D, E & I Lay shaft gear wheel J - Idler gear wheel 1,2 - Sliding Dog clutch

Procedure: 1. Disconnect battery terminals. 2. Remove front and rear propeller shaft bolts and removed propeller shaft to the chassis frame. 3. Disconnect clutch assembly. 4. Disconnect speed o meter cable reverse indicator switch wiring connections. 5. Drain gear box trolley oil in a clean container. 6. Locate the gear box trolley under the gear box and unscrew clutch housing unit. 7. Check for natural position of selectors spindles, after remove selector casing unit. 8. Remove rear flange from main shaft. 9. Remove clutch shaft, ball bearing, main shaft, counter shaft, pinion wheel, dog clutch and roller bearings from casing. 10. Clean all parts in kerosene. 11. To assemble counter shaft assembly. 12. To assemble main shaft, assembly. 13. Fit the 1st gear, sliding dog clutch, reverse gear, pinion wheel, and thrust washer. 14. Fit 2nd gear and 3rd gear fixed dog clutch, and sliding dog clutch. 15. Fit 4th and 5th fixed dog clutch and sliding dog clutch. 16. To check the individual gears end play measure the height difference between the bush and the gear. 17. Check for free engagement of sliding dog clutches. 18. Check for free rotation of I, Reverse, II, III and IV gear wheel. 19. Fit the clutch shaft and ball bearing. 20. Fit the flange, and selector mechanism to clutch assembly, gear box casing. 21. Fill lubricating oil. Check for filly of lubricating oil up to required level. 22. Check for any oil leakage, noise and smooth running. 23. Fit the vehicle, Connect to Battery terminals. 24. Check for proper gear engagement for different in running condition. Observations:1) No. of speeds,2) No of teeth on pinion, fixed to clutch shaft3) No of teeth on counter gear connected with pinion shaft

SI NoGear driveNo of teeth on driving gearNo of teeth on driven gearGear ratio

Calculations:

Gear ratio = No of teeth on counter gear of pinion shaft * No of teeth on driven gear No of teeth on the pinion of clutch shaft * no of teeth on driving gear

Results: Thus the constant mesh gear box is dismantled, inspected and reassembled

Viva questions:1. Why gear box is used in a vehicle.2. Discus the advantages of constant mesh gearbox over sliding mesh gearbox. 3. Explain the common troubles uncounted in gear boxes and suggest Suitable remedies.4. What is synchromesh device?5. What may be the possible reason when the gear slips out of engagement?6. What should be the cause when the vehicle is running with excessive noise in the gear box?

EXPT NO:14 DATE:TRANSFER CASE

Aim of the experiment: To study and calculate gear ratio for given Transfer Gearbox model.

Theory: Atransfer caseis a part of afour-wheel-drivesystem found in four-wheel-drive andall-wheel-drivevehicles. The transfer case is connected to thetransmissionand also to the front and rearaxlesby means ofdrive shafts. It is also referred to as a "transfer gear case", "transfer gearbox, transfer box", "jockey box", or simply "T-case".Functions The transfer case receives power from the transmission and sends it to both the front and rear axles. This is accomplished by means of ashifter, similar to that in amanual transmission. On some vehicles this may be electronically operated by a switch instead. Some vehicles, such as all-wheel-drive sports cars, have transfer cases that are not selectable. Such a transfer case is permanently "locked" into all-wheel-drive mode. Transfer cases designed for off-road use can mechanically lock the front and rear axles when needed (e.g. when one of the axles is on a slippery surfaces or stuck in mud, whereas the other has better traction). This is the equivalent to thedifferential lock.

Formula:Gear ratio=No of teeth on driven gear/No of teeth on driving gear

Equipment- Transfer case gear box

Vehicle Make

Vehicle Model

Result:

Viva questions 1. What is transfer box? Where it is used2. List out the vehicles in which transfer box is used.1

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