15. Repeat steps 1 - 14 to remove valve assemblies from
second cylinder head.
Cleaning
1. Remove all carbon deposits from combustion chamber
and machined surfaces of cylinder heads. Exercise
caution to avoid removing any metal material. For best
results, use an air tool with a worn fine wire brush.
Scraping may result in scratches or nicks.
2. To soften stubborn deposits, soak the cylinder heads in
a suitable chemical solution or other carbon and gum
dissolving agent. Repeat steps 1-2 as necessary.
NOTE: Do not use glass or sand to bead blast surfaces
exposed to the engine oil. Bead blasting materials become
lodged in the pores of the casting where they cannot be
removed through ordinary cleaning methods. Only after the
engine is put to use will heat expansion cause this material
to be released, and the resulting oil contamination will
accelerate wear and lead to engine failure.
3. Thoroughly clean the cylinder heads, valves, valve spring
retainers, valve springs, tapered keepers, tappets, push
rods, and rocker arms in a non-volatile cleaning solution
or solvent. Follow up with a thorough wash in hot soapy
water. Blow dry with low pressure compressed air.
Inspection
Cylinder Head
1. Check for scratches and nicks on all gasket sealing
surfaces.
2. Check condition of spark plug threads. If necessary,
soften deposits with penetrating oil and clean out with a
thread chaser.
3. Check the cylinder head to cylinder mating surface for
warpage or distortion. Discard the cylinder head if any
low spot is 0.002 inches (0.05 mm) or more. Proceed as
follows:
A. With the combustion chamber side facing up, set
a straightedge diagonally across the length of the
cylinder head gasket surface (A, Figure 109).
B. Slide a feeler gauge beneath the straightedge to
check for warpage.
C. Check the opposite diagonal to verify that the gasket
surface is flat.
D. Set a straightedge vertically across the length of the
cylinder head gasket surface (B). Use feeler gauge
to check for warpage. Repeat step on opposite side.
E. Set a straightedge horizontally across the length
of the cylinder head gasket surface (C). Use feeler
gauge to check for warpage. Repeat step on
opposite side.
92 vanguardpower.com
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