ENGINE
3.32
VALVE SEAT RECONDITIONING, CONT.
Follow the manufacturers instructions provided with
the valve seat cutters in the Cylinder Head Recondi-
tioning Kit (PN 2200634). Abrasive stone seat re-
conditioning equipment can also be used. Keep all
valves in order with their respective seat.
NOTE: Valve seat width and point of contact on the
valve face is very important for proper sealing. The
valve must contact the valve seat over the entire cir-
cumferenceoftheseat,andtheseat mustbe theprop-
erwidthallthewayaround. Iftheseatisuneven,com-
pressionleakagewillresult. Iftheseatistoowide,seat
pressure is reduced, causing carbon accumulation
and possible compression loss. If the seat is too nar-
row,heattransferfromvalvetoseatisreducedandthe
valve may overheat and warp, resulting in burnt
valves.
1. Whenthoroughlyheated,placecylinderheadonblocksofwoodwhichwillallowtheoldguidestoberemoved.
2. Using valve guidedriver ,drive guidesout of the cylinderheadfromthe combustion chamber side. Becareful
not to damage guide bore or valve seat when removing guides.
3. Place cylinder head on cylinder head table.
NOTE: Be sure cylinder head is still at 212° F
(100° C) before installing new guides.
4. Place a new guide in the valve guide installation
tool and press guide in to proper depth. Check
height of eachguideabovethe cylinder head (A).
NOTE: Theguidecanalsobedrivenintothe
properdepth. Inspect theguidecloselyforcracks
or damage if a driver is used.
Reaming The Valve Guide
5. Allow cylinder head to cool to room temperature.
Apply cutting oil to the reamer . Guides should be
reamed from the valve spring side of the cylinder
head. Ream each guide to size by turning the
reamer clockwise continually. Continue to rotate
reamer clockwise during removal of the tool.
6. Cleanguides thoroughlywithhotsoapywaterand
anylonbrush. Rinseanddrywithcompressedair.
Apply clean engine oil to guides.
Too
Wide
Uneven
Good
Too
Narrow
A
Valve Guide Installed Height
Valve Guide Height:
.689-.709I (17.5-18.0 mm)
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