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151
ENGINE
6A2-11
Fig. 6A2-18 Cylinder Head Dowell Pins
Fig. 6A2-19 Head Bolt With Sealer Applied
Fig. 6A2-20 Cylinder Head Tightening Sequence
Disassemble
1. Remove the cylinder head and gasket as previously
described. Place cylinder head on two blocks of wood to
prevent damage.
2. Remove rocker arms.
3. Using valve spring compressor, compress the valve
springs and remove valve locks. Remove spring caps, spring
seats, oil seals, springs and spring dampers (Fig. 6A2-21).
4. Remove valves from bottom of cylinder head and
place them in a rack in their proper sequence so they can be
assembled in their original positions.
Clean and Inspect
1. Clean all carbon from combustion chambers and valve
ports.
2. Thoroughly clean the valve guides (Fig. 6A2-22).
3. Clean all carbon and sludge from push rods and rocker
arms.
4. Clean valve stems and heads on a bufing wheel.
Fig. 6A2-2 1 Upper Valve Train Parts
Fig. 6A2-22 Cleaning Valve Guide Bore (Typical)
5. Clean carbon deposits from head gasket mating
surfaces.
6. Wash all parts in cleaning solvent and dry them
thoroughly.
7. Inspect the cylinder head for cracks in the exhaust
ports, combustion chambers, or external cracks in the water
chamber.
8. Inspect the valves for burned heads, cracked faces or
damaged stems.
9. Check fit of valve stems in their respective bores.
(Excessive valve stem to bore clearance will cause lack of
power, rough idling and noisy valves, and may cause valve
breakage. Insufficient clearance will result in noisy and sticky
functioning of the valve and disturb engine smoothness of
operation).
By using a micrometer and a suitable telescope hole gage,
check the diameter of the valve stem in three places; top,
center and bottom.
NOTE: Exhaust valves have tapered stems and are
approximately .001 larger at top of stem then at head
end.
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