Engine ServiceEngine Service

Cylinder headsCylinder heads

1. Clean 2. Check for Cracks inspect exhaust port

and in between valves 3. Check for Warpage 4. Inspect Guides for wear 5. Inspect Seats

6. Inspect and repair studs and threaded holes

7. Redo guides 8. Redo seats 9. Replace freeze plugs

ValvesValves

Keep valves in order unless you are going to replace them all

1. Clean with a power wire brush 2. visual inspect face, margin, stem and

keeper groove 3. Mic stem 4. Grind stem end flat then bevel end 5. Grind valve face

Cylinder headsCylinder heads

1. Clean Use a hot tank, Jet spray cabinet then wire

wheel in a drill Use body sander with 80 grit paper to finish

the surface

2. Check for Cracks2. Check for Cracks

inspect exhaust port and in between valves

Magnafluxing

Dye penetrant

3. Check for Warpage3. Check for Warpage

Straightedge and feeler gauge

4. Inspect Guides for wear4. Inspect Guides for wear

Bad Valve guides will cause 1. oil consumption 2. Poor seating 3. Valve breakage Should have .0015-.002 clearance use small hole gauge and mike or use pilot to find size of guide

5. Inspect Seats5. Inspect Seats

is it a pressed in seat

6. Inspect and repair studs and threaded holes6. Inspect and repair studs and threaded holes

7. Redo guides7. Redo guides

1. replacing guides cast Iron bronze 2. Oversize valve stem

3. Knurling use plenty of knurling oil ream wet clean thoroughly If valve mikes .341 Ream with a .341 and

go up .001 at a time until the valve fits snug but moves free.

8. Redo seats8. Redo seats

Grind or cut valve seat usually to 1/16 (.0625)

Intake width of a dime Exhaust width of a nickel

3 angle valve job 30, 45, 60

Seat must contact valve in middle of face and be even top and bottom all around.

On interference angle seat will only touch top side of valve when cold make sure it is at upper end on face

make sure pilot is tight in the valve guide (hint use pilot to find size of guide)

select proper stones & dress Do not ruin the diamond Seat will only be as accurate as the stone

redress the stone often If using cutters make sure they are set up

proper

9. Replace freeze plugs9. Replace freeze plugs

use a non harding sealant

(have not tried but heard)if a bolt is rusted in a block melt candle wax on the threads the wax acts as a lube & will allow it to be easily removed

Valves - Keep valves in orderValves - Keep valves in order

1. Clean with a power wire brush

2. visual inspection2. visual inspection

inspect face, margin, stem and keeper groove

Check each valve for burned or pitted face caused by; sticky guides, Insufficient tappet clearance, weak springs, clogged coolant passages, warped valve stem, improper ignition or valve timing.

Carbon deposit worn valve guides, or damage seals

3. Mic stem3. Mic stem

Mike valve stem for wear if you feel a ridge with fingernail replace it

.002 wear Max. like to keep it to .001 Chuck valve in valve grinder and check for

warp

4. Grind stem end flat then bevel the end4. Grind stem end flat then bevel the end

5. Grind valve face5. Grind valve face

Make sure you know what angle to grind to 29, 30 - 44, 45

dress stone often Grind valve until pits are gone and face is

clean and smooth if margin is less then 1/32 discard valve

creates a hot spot

Before grinding valves check valve stem installed height on some engines valves are adjusted by grinding off the valve stem end

SPECIFICATIONS FOR VALVE SPRING INSTALLED HEIGHT ARE NOT PRINTED IN ANY BOOK. PLEASE MEASURE BEFORE GRINDING VALVES.

especially on Pontiac, Cadillac Chrysler, and Ford pinto and Buick engines.

Valve springsValve springs

Check for tension check for length (free height) and squareness check installed height check for coil bind if after market cam is

installed add shims to correct Don't add over .060

thickness

replace if any defects are found on springs Check rocker arms for wear Especially ball swivel type such as Chevy’s.

use

Check rocker arm shafts for wear make sure they are installed correctly or oil holes will not line up.

On rocker arm studs if replacement is needed I recommend drilling & tapping to install after market type screw in studs.

Valve Stem SealsValve Stem Seals

Umbrella Do not reuse seals O-ring Positive type bullet - plastic sleeve

THE ENDTHE END