engine repair a1

7/23/2019 Engine Repair A1

1/28

Engine Repair (A1)The following report shows all assessment questions, indicates if the answer you provided was correct or incorrect, and reveals the correctanswer.

- Correct - Incorrect - Unanswered

1)

In the figure, Technician A says the measurement indicates combustion chamber volume. Technician says themeasurement indicates valve stem installed height. !ho is correct"

IncorrectA only

#orrect B only

IncorrectBoth A and B

IncorrectNeither A nor B

$uestion Rationale

Answer A is incorrect. This measurement cannot check combustion chamber cubic

centimeters (cc).

Answer B is correct.Only Technician B is correct. Valve spring installed height is

indicated.

Answer is incorrect. Only Technician B is correct.Answer ! is incorrect. Technician B is correct.

%)

The tool sho&n in the figure is installed on the engine oil cooler line. Technician A says this tool is used toinstall the line in the cooler. Technician says this tool is used to remove the o'ring from the line. !ho iscorrect"

Print


2/28

IncorrectA only

IncorrectB onlyIncorrectBoth A and B

#orrect Neither A nor B

$uestion Rationale

Answer A is incorrect. No tool is necessary to install the line into the cooler. The line issimply pushed in" and then gently pulled on to make sure the retaining clips are holding it

securely in place.

Answer B is incorrect. There is not an o#ring installed on this line.Answer is incorrect. Neither Technician is correct.

Answer D is correct.Neither Technician is correct. This tool is used to remove the engine

oil cooler line $rom the engine oil cooler.)

Technician A says that replacing a 1*+ (%+#) thermostat &ith a 1-+ (-1+#) thermostat &ill cause the engineto &arm up faster. Technician says that removing the thermostat from an engine may cause /hot spots0 todevelop in the engine. !ho is correct"

IncorrectA only

#orrect B only



$uestion Rationale

Answer A is incorrect. %nstalling a higher rated thermostat will not cause the engine to warm

up $aster. %t will" however" cause it to operate at a higher temperature.

Answer B is correct.Only Technician B is correct. The thermostat not only regulatesengine temperature but also regulates coolant $low. Operating an engine without a

thermostat can cause incorrect pressure di$$erentials within the cooling system and can result

in incorrect $low throughout the engine.Answer is incorrect. Only Technician B is correct.

Answer ! is incorrect. Technician B is correct.)

An engine has lo& po&er. #ran2ing compression readings (psi) are sho&n in the figure. !hich additional test&ill best help isolate the problem"


3/28

Incorrect%ntake mani$old vacuumIncorrect&'haust restriction

#orrect ylinder leakage

Incorrectunning compression

$uestion Rationale

Answer A is incorrect. This engine most likely has a head gasket leaking between cylinders and *. An intake mani$old test will not veri$y the suspicion.

Answer B is incorrect. An e'haust restriction test will not help con$irm a leaking head

gasket between cylinders and *.

Answer C is correct.A cylinder leakage test will identi$y a leaking head gasket between

two cylinders.Answer ! is incorrect. A running compression test will not de$initely con$irm a leaking head

gasket between two cylinders.)

An engine has an oil lea2. Technician A says fluorescent dye can be used to locate the source of the lea2.Technician says smo2e can be used to locate the source of the lea2. !ho is correct"

IncorrectA only

IncorrectB only

#orrect Both A and B


$uestion Rationale

Answer A is incorrect. Technician B is also correct.

Answer B is incorrect. Technician A is also correct.Answer C is correct. Both Technicians are correct. +luorescent dye is a good method tolocate engine oil leaks. A smoke generator can also be used to $ill the crankcase with smoke

and see where the smokes e'its.

Answer ! is incorrect. Both Technicians are correct.3)

!hich statement is true concerning the removal of cylinder heads"

IncorrectThe engine should be at operating temperature.

IncorrectThe cylinder head bolts should be removed in the same se,uence as they


4/28

were installed.#orrect The engine should be at room temperature.

IncorrectThe cylinder head bolts should be removed $rom $ront to rear.

$uestion Rationale

Answer A is incorrect. The engine should be at room temperature" not operating

temperature.Answer B is incorrect. The cylinder head bolts should be removed in the opposite se,uence

as they were installed.

Answer C is correct.The engine should be room temperature.Answer ! is incorrect. The cylinder head bolts should be removed in the opposite se,uence

as they were installed.4)

Technician A says a special puller and installer tool may be re5uired to remove and install the vibration damper.Technician says if the inertia ring on the vibration damper is loose, the damper must be replaced. !ho iscorrect"

IncorrectA only

IncorrectB only

#orrectBoth A and B


$uestion Rationale

Answer A is incorrect. Technician B is also correct.Answer B is incorrect. Technician A is also correct.

Answer C is correct.Both Technicians are correct. A special puller and installer tool is

re,uired to remove and install the vibration damper. -sing a regular gear puller to removethe vibration damper will damage the damper. A loose inertia ring on the damper re,uires

replacement o$ the damper.

Answer ! is incorrect. Both Technicians are correct.)

The tool sho&n in the figure is used to6

Incorrectremove camsha$t bearings only.

Incorrectinstall camsha$t bearings only.

Incorrectmeasure camsha$t bearing alignment.

#orrect both remove and install camsha$t bearings.

$uestion Rationale

Answer A is incorrect. The tool can also be used to install camsha$t bearings.

Answer B is incorrect. The tool can also be used to remove camsha$t bearings.

Answer is incorrect. The tool is not used $or taking measurements.

Answer D is correct.The tool is used to remove and install the camsha$t bearings.- Technician A says timing gear bac2lash may be measured &ith a dial indicator. Technician says timing gear


5/28

) bac2lash may be measured &ith a micrometer. !ho is correct"

#orrect A only

IncorrectB only



$uestion Rationale

Answer A is correct.Only Technician A is correct. A dial indicator is used to measure

backlash.

Answer B is incorrect. amsha$t gear backlash cannot be measured with a micrometer.Answer is incorrect. Only Technician A is correct.

Answer ! is incorrect. Technician A is correct.1*)

!hich of these must be performed to measure valve clearance on mechanical valvetrains"

IncorrectBack o$$ each aduster two turns.

#orrect otate the cam lobe to the base circle $or the valve being adusted.

Incorrect/ove each cylinder to the beginning o$ the intake stroke.

IncorrectAdust each valve to 0ero lash be$ore taking measurements.$uestion Rationale

Answer A is incorrect. There is no reason to back o$$ the aduster unless the clearance is

insu$$icient.

Answer B is correct.To get correct measurements" the valve being adusted must be

completely closed and the cam on the base circle (the bottom o$ the lobe).

Answer is incorrect. The beginning o$ the intake stroke would have the valve beginning toopen.

Answer ! is incorrect. The clearance would be 0ero i$ you adusted the valve to 0ero.11)

!hich tools &ould be used to chec2 cylinder head &arpage"

Incorrect!ial indicator and $eeler gauge

Incorrect/icrometer and dial indicatorIncorrect!ial caliper and straightedge

#orrect 1traightedge and $eeler gauge

$uestion Rationale

Answer A is incorrect. A dial indicator and $eeler gauge would not be used to check cylinder

head warpage.Answer B is incorrect. A micrometer and dial indicator would not be used to check cylinder

head warpage.

Answer is incorrect. A dial caliper and straightedge would not be used to check cylinderhead warpage.

Answer D is correct.A straightedge and $eeler gauge are the correct tools to use whenchecking cylinder head warpage.

1%)

!ith the engine idling, a vacuum gauge connected to the inta2e manifold fluctuates as sho&n in the figure.These vacuum gauge fluctuations may be caused by6


6/28

Incorrectlate ignition timing.Incorrectintake mani$old vacuum leak at the throttle body.

Incorrecta restricted e'haust system.

#orrect sticky valve stems and guides.

$uestion Rationale

Answer A is incorrect. 2ate ignition timing would result in a low" steady reading.Answer B is incorrect. An intake mani$old leak at the throttle body would cause a very low"

steady reading.

Answer is incorrect. A restricted e'haust system would cause vacuum to slowly decreasea$ter the engine was accelerated and held steady.

Answer D is correct.%$ the valve sticks in its guide" it may not completely close" resultingin a compression loss and pulsing vacuum gauge.

1)

In the figure, the item identified in green is a7an6


7/28

Incorrectoil $ilter.

Incorrect$uel $ilter.

#orrect engine oil cooler.

Incorrecttransmission oil cooler.

$uestion RationaleAnswer A is incorrect. This is an oil cooler. 3owever" the oil $ilter does screw onto thebottom o$ it.

Answer B is incorrect. This is not a $uel $ilter.

Answer C is correct.This an engine oil coolerAnswer ! is incorrect. This is an engine oil cooler" not a transmission oil cooler.

1)

8n an overhead cam (89#) cylinder head &ith removable bearing caps, &hich of the follo&ing is used tomeasure bearing alignment"

#orrect A straightedge

Incorrect4lastigage

IncorrectA dial indicator

IncorrectA telescoping gauge$uestion Rationale

Answer A is correct.A straightedge and $eeler gauge can be used to check alignment.

Answer B is incorrect. 4lastigage cannot e$$ectively measure bearing alignment.Answer is incorrect. A dial indicator could not measure bearing alignment.

Answer ! is incorrect. A telescoping gauge is not used to measure bearing alignment.1)

!hat is being measured in the illustration in the figure"

IncorrectValve spring installed height

IncorrectValve spring tension

IncorrectValve spring $ree length

#orrect Valve spring s,uareness

$uestion Rationale

Answer A is incorrect. Valve spring installed height is measured with the spring assembled


8/28

in the head.

Answer B is incorrect. Valve spring tension is measured with a spring tension gauge.

Answer is incorrect. This illustration could be used to illustrate valve spring $ree length5however" since the 678#inch dimension is called out" the illustration is showing how to

measure valve spring s,uareness.

Answer D is correct.Valve spring s,uareness is being checked" and the speci$ication is678 inch.

13)

Technician A says &ater pump noise may be caused by faulty shaft bearings. Technician says &ater pumpnoise may be caused by the &ater pump impeller contacting the cover. !ho is correct"

IncorrectA only

IncorrectB only



$uestion Rationale


Answer B is incorrect. Technician A is also correct.

Answer C is correct.Both Technicians are correct. 9hen water pump bearings $ail" it isusually due to coolant entering the bearing. 9hen the sealed" sel$#lubricating bearings begin

to pit $rom overheating" they will make a growling noise. %n some cases" the water pumpimpeller has come o$$ the pump sha$t or the bearing has $ailed" allowing the impeller wheel

to drag against the pump housing or timing cover" resulting in a loud grinding noise.


All of the follo&ing are reasons to replace a hydraulic valve lifter E:#E;T6

Incorrecte'cessive bleed#down.

#orrect conve' bottom.

Incorrectpitted bottom.

Incorrect

$lat bottom.$uestion RationaleAnswer A is incorrect. A normal $unction o$ a hydraulic li$ter is to pretension the valvetrainwith oil pressure. 1ome o$ the oil pressure is lost when the engine is shut o$$" particularly on

the cylinders with valves open. This is called bleed#down or leak#down. &'cessive bleed#

down will cause valvetrain noise.

Answer B is correct.2i$ters are somewhat conve' on the bottom i$ they are good.

Answer is incorrect. Valve li$ters should be replaced i$ the bottom is pitted.

Answer ! is incorrect. Valve li$ters should be replaced i$ the bottom is $lat.1)

Technician A says that camshaft lobe lift can be chec2ed &ith the camshaft still mounted in the engine.Technician says that camshaft runout can be chec2ed &ith the camshaft still mounted in the engine. !ho iscorrect"

#orrect

A onlyIncorrectB only



$uestion Rationale

Answer A is correct.Only Technician A is correct. 2obe li$t can be measure with a dial

indicator while the camsha$t is still in the engine.


9/28

Answer B is incorrect. amsha$t runout cannot be measured with the camsha$t still mounted

in the engine. V blocks must be used.

Answer is incorrect. Only Technician A is correct.Answer ! is incorrect. Technician A is correct.

1-

)

In the figure, the technician is most li2ely chec2ing6

Incorrectvalve guide depth.

Incorrectvalve seat angle.

Incorrectcylinder head $latness.

#orrect valve seat runout.

$uestion Rationale

Answer A is incorrect. Valve guide depth is measured with a depth micrometer. The toolshown does not measure valve guide depth.

Answer B is incorrect. The tool shown does not measure valve seat angle.Answer is incorrect. A straightedge and $eeler gauge are used to measure cylinder head

$latness.

Answer D is correct.Valve seat runout (concentricity) is being measured.%*)

A technician is servicing an overhead camshaft (89#) cylinder head that is designed &ithout bearings. Ifcamshaft


10/28

%1)

!hich of the follo&ing &ould be considered an acceptable cylinder &all taper measurement"

#orrect :.:::6 inch

Incorrect:.::6 inch

Incorrect:.:6: inch

Incorrect:.6:: inch

$uestion Rationale

Answer A is correct.;enerally speaking" :.:::6 inch would be considered an acceptable

amount o$ cylinder taper $or an engine to be rebuilt.

Answer B is incorrect. :.::6 inch would be too much taper.Answer is incorrect. :.:6: inch would be too much taper.

Answer ! is incorrect. :.6:: inch would be too much taper.%%)

The figure sho&s an e=ample of the roc2er arm assembly on an engine e5uipped &ith hydraulic lifters. !henadEA?T >I@E> to be performed by a technicianis6

Incorrectturning the adusting nut clockwise one#$ourth turn at a time.

#orrect turning the adusting nut clockwise two turns at a time.

Incorrectturning the adusting nut counterclockwise until a clicking noise occurs.

Incorrectinstalling oil shrouds on the rocker arm.

$uestion Rationale

Answer A is incorrect. The adusting nut is turned one#$ourth o$ a turn at a time.

Answer B is correct.The technician is unlikely to rotate the adusting nut 9 two turns at

a time" since this could cause the valve and piston to collide" damaging valvetrain

components.Answer is incorrect. The nut is turned 9 until a clicking noise is heard.

Answer ! is incorrect. Oil shrouds should be installed to keep the engine cleaner.%)

An e=cessive sulfur smell in the e=haust of a vehicle &ith a catalytic converter can be an indication of6

Incorrecta lean $uel mi'ture.

Incorrectcoolant leaking into a combustion chamber.

#orrect a rich $uel mi'ture.


11/28

Incorrecta vacuum leak.

$uestion Rationale

Answer A is incorrect. A lean $uel mi'ture would not cause a sul$ur smell.Answer B is incorrect. oolant leaking into the combustion chamber would cause a gray

e'haust color.

Answer C is correct.A sul$ur smell is commonly due to raw $uel in the convertor.Answer ! is incorrect. A vacuum leak would cause a rough idle that would decrease as

engine speed increases.%)

An engine has a severe oil lea2. The technician finds the oil filter has crac2ed. !hich of the follo&ing could bethe cause"

IncorrectOil pressure relie$ valve stuck open

#orrect Oil pressure relie$ valve stuck closed

Incorrect4ressure di$$erential valve stuck open

Incorrect4ressure di$$erential valve stuck closed

$uestion Rationale

Answer A is incorrect. A stuck#open pressure relie$ valve will cause lower than normal

ma'imum oil pressure.Answer B is correct.A stuck#closed pressure relie$ valve will cause higher than normal

ma'imum oil pressure and can cause the oil $ilter to rupture.Answer is incorrect. A stuck#open pressure di$$erential valve will allow oil to bypass the

engine oil $ilter" resulting in dirty oil reaching the bearings.

Answer ! is incorrect. A stuck#closed pressure di$$erential valve will cause low oil $low to

the bearings during times o$ thick engine oil" such as when the engine is cold. This wouldnot cause the oil $ilter to rupture" however" because ma'imum oil pressure would still be

controlled by the oil pressure relie$ valve.%)

!hen chec2ing the installed spring seat pressure, a spring fails to meet the minimum specification. Theinstallation of a spring shim, ade5uate to return seat pressure to spec, results in coil bind at ma=imum valve lift.!hich of these is the best solution"

Incorrecteplace the valve seat to correct the installed height.

#orrect eplace the spring to correct seat pressure.


12/28

Incorrecteplace the valve to correct seat pressure.

Incorrect-se the ne't thinnest spring shim that will not cause coil bind.

$uestion Rationale

Answer A is incorrect. %$ the installed height is incorrect" a valve seat may indeed repair the

condition" but the ,uestion relates to spring seat pressure.

Answer B is correct.1pring shims should not be used to correct minor seat pressure issues.%n most cases" the sa$er and longer#lived approach is to simply replace the spring.

Answer is incorrect. This is e$$ectively the same answer as A. EA?T >I@E> cause of an oil saturated ;#B filter is6

Incorrectworn piston rings.

Incorrectan obstructed 4V vacuum hose.

#orrect a stuck#open 4V valve.

Incorrecta clogged 4V valve.

$uestion RationaleAnswer A is incorrect. 9orn piston rings are likely to cause this condition.

Answer B is incorrect. An obstructed 4V vacuum hose is likely to cause this condition.

Answer C is correct.A stuck#open 4V valve will usually cause an engine stumble andrough idle due to a vacuum leak.

Answer ! is incorrect. A clogged 4V valve is likely to cause this condition.%4)

The figure sho&s the positive cran2case ventilation (;#B) system. All of the follo&ing are symptoms of a stuc2'open ;#B valve E:#E;T6

#orrect blowby gases in the air $ilter.

Incorrectthe engine stalling.

Incorrectrough idle operation.

Incorrecta lean air7$uel ratio.

$uestion Rationale

Answer A is correct.Blowby gases in the air $ilter are caused by a stuck#closed 4V valve.


13/28

Answer B is incorrect. &ngine stalling may be caused by a 4V valve stuck in the open

position.

Answer is incorrect. ough idle may occur i$ a 4V valve is stuck in the open position.Answer ! is incorrect. A lean air7$uel mi'ture will result $rom a 4V valve stuck in the

open position.%

)

Curing a cylinder lea2age test, air is heard escaping from the inta2e manifold. !hich of the follo&ing is the most

li2ely cause"

Incorrect%ntake mani$old gasket

#orrect %ntake valve

Incorrect&'haust valve

Incorrectompression rings

$uestion Rationale

Answer A is incorrect. %$ air is leaking $rom the intake mani$old" it must be leaking past theintake valve.

Answer B is correct.%$ air is leaking $rom the intake mani$old" it must be leaking past the

intake valve.

Answer is incorrect. %$ air is leaking past the e'haust valve" it will be heard in the e'haustpipe.

Answer ! is incorrect. %$ air is leaking past the compression rings" it will be e'iting $rom theoil $iller cap.

%-)

An electric drive cooling fan circuit is sho&n. Technician A says if the coolant temperature sensor s&itch isstuc2 closed, the cooling fan &ill stop &hen the ignition is turned off. Technician says &hen the airconditioner (A7#) is turned on, the fan relay &inding &ill be grounded through the condenser s&itch to activatethe cooling fan. !ho is correct"

IncorrectA only

#orrect B only



$uestion Rationale

Answer A is incorrect. %$ the switch is stuck closed" the $an motor will continue to run


14/28

because the relay receives voltage directly $rom the battery.

Answer B is correct.Only Technician B is correct. The condenser switch turns on the $an

when the air conditioning re,uires $an operation.Answer is incorrect. Only Technician B is correct.

Answer ! is incorrect. Technician B is correct.

*)

Technician A says improper balance shaft timing causes engine vibrations. Technician says the balance

shafts are timed in relation to the camshaft7cran2shaft. !ho is correct"

IncorrectA only

IncorrectB only



$uestion Rationale

Answer A is incorrect. Technician B is also correct.Answer B is incorrect. Technician A is also correct.

Answer C is correct.Both Technicians are correct. An out#o$#time balance sha$t will cause

vibration" and the balance sha$t is timed to the camsha$t7cranksha$t.


8bserve the reading on the filter minder service indicator sho&n in the figure. !hich of the follo&ing is true"

IncorrectThe $uel $ilter needs to be replaced.

IncorrectThe air $ilter needs to be replaced.

IncorrectThe $uel $ilter is not restricted enough to need replacement.

#orrect

The air $ilter is not restricted enough to need replacement.$uestion Rationale

Answer A is incorrect. This is an air $ilter restriction gauge" not a $uel $ilter restrictiongauge.

Answer B is incorrect. The air $ilter does not need to be replaced until appro'imately =: to

=6 inches o$ restriction is indicated.Answer is incorrect. This is an air $ilter restriction gauge" not a $uel $ilter restriction

gauge.


15/28

Answer D is correct.The air $ilter currently shows less than >6 inches o$ restriction. %t does

not yet need to be replaced.%)

Technician A says the ;#B valve pictured in the figure is e5uipped &ith a flo& sensor. Technician says this;#B valve is open and closed by the E#D. !ho is correct"

IncorrectA only

IncorrectB only



$uestion Rationale

Answer A is incorrect. This is a heated 4V valve. The electrical connection is $or a 4Vvalve heater" not a $low sensor.

Answer B is incorrect. This is a heated 4V valve. The electrical connection is $or a 4Vvalve heater" not a valve to be opened and closed.Answer is incorrect. Neither Technician is correct.

Answer D is correct.Neither Technician is correct.)

Technician A says &orn valve stem seals may cause rapid valve stem and guide &ear. Technician says &ornvalve stem seals may cause e=cessive oil consumption. !ho is correct"

IncorrectA only

#orrect B only



$uestion Rationale

Answer A is incorrect. 9orn valve stem seals generally do not cause stem or guide wear.

Answer B is correct.Only Technician B is correct. 9orn valve seals will allow e'cess oil to

be drawn into the combustion chamber.

Answer is incorrect. Only Technician B is correct.Answer ! is incorrect. Technician B is correct.

)

All of the follo&ing are causes of lo& engine oil pressure E:#E;T6

Incorrectworn camsha$t bearings.


16/28

Incorrectworn cranksha$t bearings.

Incorrectweak oil pressure regulator spring tension.

#orrect restricted pushrod oil passages.

$uestion Rationale

Answer A is incorrect. 9orn camsha$t bearings may be a cause $or low oil pressure.

Answer B is incorrect. 9orn cranksha$t bearings may be a cause $or low oil pressure.Answer is incorrect. 9eak oil pressure regulator spring tension may be a cause $or low oil

pressure.

Answer D is correct.estricted pushrod oil passages will not cause low oil pressure.)

A customers car seems louder than normal and bac2fires on deceleration. Technician A says a lea2 in thee=haust system may be the cause. Technician says a small lea2 in the cooling system may be the cause. !hois correct"

#orrect A only

IncorrectB only



$uestion Rationale

Answer A is correct.Only Technician A is correct. A leak in the e'haust system can be the

cause o$ the noise as well as the back$ire.Answer B is incorrect. %t is very unlikely that a small coolant leak would cause either o$

these conditions.

Answer is incorrect. Only Technician A is correct.

Answer ! is incorrect. Technician A is correct.3)

!hich of these is the first thing to do &hen replacing a timing belt"

Incorrectemove the valve cover(s).

Incorrectemove belt tensioner.

#orrectAlign all timing marks.

Incorrectemove water pump.

$uestion Rationale

Answer A is incorrect. The timing marks should be aligned $irst.

Answer B is incorrect. The timing marks should be aligned $irst.

Answer C is correct.%$ the engine is an inter$erence engine" this is absolutely critical. &veni$ the engine is not an inter$erence engine" a lot o$ time can be saved by making sure that all

the marks are aligned prior to disassembly.

Answer ! is incorrect. %t may not be necessary to remove the water pump.4)

!hen installing a ne& spin'on type oil filter, &hich of the follo&ing &ould be the correct tightening procedure"

#orrect Tighten the $ilter three#,uarters o$ a turn by hand a$ter the gasket contacts

the base.IncorrectTighten the $ilter two and three#,uarters o$ a turn by hand a$ter the gasketcontacts the base.

IncorrectTighten the $ilter to =6 $oot#pounds.

IncorrectTighten the $ilter to 6: $oot#pounds.

$uestion Rationale

Answer A is correct.%t is a typical speci$ication to tighten the spin#on oil $ilter three#

,uarters o$ a turn a$ter the gasket contacts the base.


17/28

Answer B is incorrect. This procedure would overtighten the oil $ilter.

Answer is incorrect. This procedure would overtighten the oil $ilter.

Answer ! is incorrect. This procedure would overtighten the oil $ilter.)

An engine has had a ma


18/28

Answer D is correct.Neither Technician is correct.*)

A turbocharged engine &ith an oil consumption concern also has oil in the air inta2e piping. !hich of thefollo&ing is the >EA?T >I@E> cause for the concern"

Incorrectestricted turbocharger oil drain

Incorrectestricted air cleaner

Incorrect9orn turbocharger seals

#orrect 9orn oil control piston rings

$uestion Rationale

Answer A is incorrect. A restricted turbocharger oil drain can cause the oil to back#up in the

center section o$ the turbocharger and allow the oil to leak past the turbocharger sha$t seals.Answer B is incorrect. A restricted air cleaner can cause higher than normal vacuum on the

suction side o$ the turbocharger" which can cause oil to leak past the seals.

Answer is incorrect. 9orn turbochargers seals can cause oil to leak.

Answer D is correct.9hile worn oil control piston rings can cause oil consumption" they

would not cause oil to be in the air intake piping.1

)

Technician A says a defective &ater pump bearing may cause a gro&ling noise &hen the engine is idling.Technician says the &ater pump bearing may be ruined by coolant lea2ing past the pump seal. !ho is

correct"

IncorrectA only

IncorrectB only



$uestion Rationale



Answer C is correct.Both Technicians are correct. A de$ective water pump bearing maycause a growling noise when the engine is idling" and the water pump bearing may be ruined

by coolant leaking past the pump seal.Answer ! is incorrect. Both Technicians are correct.

%)

The item pictured in the figure is a6


19/28

Incorrectstarter tap.

#orrect bottom tap.

Incorrectplug tap.

Incorrecttapered tap.

$uestion RationaleAnswer A is incorrect. A starter tap will be tapered on the end.

Answer B is correct. This is a bottom tap" designed to install threads all the way to the

bottom o$ a hole.

Answer is incorrect. A plug tap will have a machined collar area above the cutting edge toidenti$y it.

Answer ! is incorrect. A tapered tap will be tapered on the end to ease starting in an

unthreaded hole.)

The sensor being installed in the figure is6

Incorrectcamsha$t position.

#orrect cranksha$t position.

Incorrectoil pressure.

Incorrectoil temperature.

$uestion Rationale

Answer A is incorrect. A camsha$t position sensor would be mounted higher in the engine"closer to the camsha$t.

Answer B is correct.This is a cranksha$t position sensor.

Answer is incorrect. An oil pressure sensor will normally screw into the block" not be heldin by a $lange.

Answer ! is incorrect. An oil temperature sensor will normally screw into the block" and

have a smaller probe on its end.)

A technician is preparing to install ne& oil gallery plugs in a cylinder bloc2 &ith pipe plugs. !hich of theseoperations is >EA?T >I@E> to be performed"

#orrect un a bottoming tap into the threaded gallery holes.


20/28

IncorrectApply oil resistant sealer to the new plugs.

IncorrectApply Te$lon tape to the threaded plugs.

Incorrectun a ri$le brush through the galleries.

$uestion Rationale

Answer A is correct.The technician would not run a bottoming tap through the oil gallery

bores because they have tapered pipe threads.Answer B is incorrect. This should be done.

Answer is incorrect. This should be done.

Answer ! is incorrect. This should be done.)

Cye has been installed into the coolant to help find a lea2, &hich of the follo&ing &ould also be used"

IncorrectBlack light and sunglasses

Incorrect


21/28

Answer A is incorrect. This is not a belt tension gauge.

Answer B is incorrect. This is not a belt tension gauge.

Answer is incorrect. Neither Technician is correct.

Answer D is correct.Neither Technician is correct. The tool shown is a laser belt alignment

tool. %t is used to ensure that the pulleys o$ a belt drive system are properly aligned. The tool

is used to help $ind the source o$ accessory drive belt noise.4)

Refer to the chart in the figure. !hich tor5ue specification is correct"

Incorrectharge air cooler (A) coolant tube assembly bolts =6 $t.#lb

Incorrectamsha$t position sensor bolt *? N@m

#orrect amsha$t position sensor bolt >: N@m

Incorrectharge air cooler (A) coolant tube assembly bolts *? $t.#lb

$uestion Rationale

Answer A is incorrect. A coolant tube assembly bolts speci$ication is >: Newton#meters


22/28

or *? inch#pounds.

Answer B is incorrect. amsha$t position sensor bolt tor,ue speci$ication is >: Newton#

meters or *? inch#pounds.

Answer C is correct.amsha$t position sensor bolt tor,ue speci$ication is >: Newton#

meters or *? inch#pounds.

Answer ! is incorrect. A coolant tube assembly bolts speci$ication is >: Newton#metersor *? inch#pounds.)

In the figure sho&n, Technician A says noise may be present if the measurement is too large. Technician saysthat main bearing damage &ill occur if the measurement is too small. !ho is correct"

IncorrectA only

IncorrectB only

#orrect Both A and BIncorrectNeither A nor B

$uestion Rationale



Answer C is correct.Both Technicians are correct. &'cessive crank end play can cause a

clunk noise when accelerating $rom a stop. %nade,uate end play can cause damage to the

thrust sur$aces o$ the thrust bearings.

Answer ! is incorrect. Both Technicians are correct.-)

The figure sho&s the cylinder and ring ridge. If the amount of cylinder &ear does not re5uire cylinder reboring,Technician A says the ring ridge at the top of each cylinder can be removed &ith **'grit sandpaper. Technician says the ring ridge at the top of the each cylinder can be removed &ith a %**'grit bead hone. !ho is correct"


23/28

IncorrectA onlyIncorrectB only



$uestion Rationale

Answer A is incorrect. A ridge reamer should be used to remove the ridge.Answer B is incorrect. 1andpaper should not be used to remove the ring ridge. 3owever"

sandpaper will o$ten be used to remove the carbon buildup.


Answer D is correct.Neither Technician is correct. A ridge reamer is the correct removal

tool.*)

A technician is searching for the source of a coolant lea2. !hen should the coolant dye be added"

#orrect 9ith the engine cold

Incorrect9ith the engine at operating temperature

IncorrectOnly a$ter the coolant is replaced

IncorrectOnly a$ter the coolant recovery bottle has been purged

$uestion Rationale

Answer A is correct.The radiator cap should only be removed on a cold engine. There$ore"

the coolant dye should only be added to a cold engine.Answer B is incorrect. The radiator cap should never be removed on an engine at operating

temperature" as there is a substantial risk o$ personal inury.

Answer is incorrect. The coolant does not need to be replaced prior to installing the dye.3owever" the coolant may need to be replaced a$ter the leak is located and the repair is

made.

Answer ! is incorrect. There is no reason to purge the coolant recovery bottle prior toinstalling the coolant dye. The coolant dye needs to be added to the radiator" not the

recovery bottle. %$ it were added to the recovery bottle" it would take many warmup cycles to

allow the dye to mi' with the coolant in the cooling system. Technician A says that balance shafts should be chec2ed for runout follo&ing the same procedure used for


24/28

1)

measuring camshaft runout. Technician says that balance shaft bearing


25/28

Answer is incorrect. This is not at the highest wear point.

Answer ! is incorrect. This measurement would give the out#o$#round $or the cylinder at the

bottom.)

Technician A says &orn valve loc2 grooves may cause the valve loc2s to disengage from the valve stem &ith theengine running, resulting in severe engine damage. Technician says &orn valve loc2 grooves may cause aclic2ing noise &ith the engine idling. !ho is correct"

#orrectA only

IncorrectB only



$uestion Rationale

Answer A is correct.Only Technician A is correct. 9orn lock grooves can allow the

keepers to $it too loosely and come out during engine operation.Answer B is incorrect. 9orn valve lock grooves will not cause a clicking noise at idle.

Answer is incorrect. Only Technician A is correct.

Answer ! is incorrect. Technician A is correct.

)

An engine is idling at 4* rpm. The pointer on the vacuum gauge in the figure is floating bet&een 11 and 13 in.

9g. The most li2ely cause &ould be6

Incorrectretarded timing.

Incorrectadvanced timing.

Incorrecta stuck &; valve.

#orrect too lean an idle mi'ture.

$uestion Rationale

Answer A is incorrect. etarded timing would not result in gauge $luctuation. %t would result

in a low steady gauge.

Answer B is incorrect. Advanced timing would not result in gauge $luctuation. %t would

result in a higher than normal reading.Answer is incorrect. A stuck &; valve would not result in gauge $luctuation. %t would

result in a pulsing needle or a low reading" depending on the location o$ the &; valve.

Answer D is correct.A lean air7$uel mi'ture could be the result o$ a $ailed inector and


26/28

could result in a pulsing needle.)

In the figure, ho& is valve lash ad


27/28

IncorrectValve guide height

IncorrectValve seat depth

#orrect ylinder head warpage

Incorrect%nstalled height

$uestion RationaleAnswer A is incorrect. Valve guide height is measured on the other side o$ the head.Answer B is incorrect. Valve seat depth is not usually measured.

Answer C is correct.The head is being checked with a straightedge and a $eeler gauge. %$

the clearance $ound between the head and the straightedge is over the manu$acturerCs specs"the head must be machined or replaced.

Answer ! is incorrect. %nstalled height is measured on the other side o$ the head.4)

Technician A says that a soft or gummy heater hose may be caused by a missing e=haust manifold heat shield.Technician says that a brittle or hard lo&er radiator hose may be caused by engine oil lea2ing onto the hose.!ho is correct"

IncorrectA only

IncorrectB only



$uestion Rationale

Answer A is incorrect. &'cessive heat will cause a heater hose to become hard and brittle.

Answer B is incorrect. &ngine oil will cause a radiator hose to become so$t and gummy.


Answer D is correct.Neither Technician is correct.)

The customer is concerned about a loud popping noise, most noticeable during acceleration. !hich of these isthe most li2ely cause"

Incorrect%ntake mani$old leak

Incorrectooling system leak

Incorrect/issing air $ilter

#orrect &'haust mani$old leak

$uestion Rationale

Answer A is incorrect. An intake mani$old leak" i$ it can be heard" would be more o$ an air

rushing or whistling noise.

Answer B is incorrect. A cooling system leak usually does not make a sound.Answer is incorrect. A missing air $ilter would not cause a popping noise on acceleration.

Answer D is correct.An e'haust mani$old leak has a de$inite popping sound that can be

much more noticeable on acceleration.-

)

!hen discussing camshaft bearing clearance, Technician A says e=cessive camshaft bearing clearance mayresult in lo&er than specified oil pressure. Technician says e=cessive camshaft bearing clearance may cause

a clic2ing noise &hen the engine is idling. !ho is correct"#orrect A only

IncorrectB only



$uestion Rationale

Answer A is correct.Only Technician A is correct. 2ow oil pressure is usually caused by


28/28

worn bearings.

Answer B is incorrect. &'cessive camsha$t bearing clearance will not cause a clicking noise

at idle.Answer is incorrect. Only Technician A is correct.

Answer ! is incorrect. Technician A is correct.3

*)

A cooling system is being chec2ed &ith a pressure tester. The gauge rapidly rises &hen the engine is started.

Technician A says this could be caused by a crac2 in the combustion chamber. Technician says this could becaused by clogged tubes in the radiator. !ho is correct"

#orrect A only

IncorrectB only



$uestion Rationale

Answer A is correct.Only Technician A is correct. ompression gases in the cooling

system will cause an immediate pressure rise.

Answer B is incorrect. A clogged radiator would not cause this.

Answer is incorrect. Only Technician A is correct.Answer ! is incorrect. Technician A is correct.

engine repair a1

Documents