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 TM 10-3930-633-34
excessively burned areas in the exhaust outlet
ports.
(2) Check the cylinder head for cracks and
inspect the gasket surface for burrs and nicks.
Replace the head if it is cracked.
FREE TURNING
SPRING RETAINER
(3) When a cylinder head has been removed
due to gasket leakage, check the cylinder head
gasket surface for flatness, using a straightedge
laid across the surface. A feeler gage can be used
under the straightedge to determine warpage.
The cylinder head must measure flat within 0.006
inches in any 6 inches of length, or within 0.007
inches overall. The cylinder head may be planed.
and ground up to 0.010 inch to correct a warped
surface.
(4) Check valve seat runout, using a runout
gage as shown in figure 6-10. Valve seat runout
must not exceed 0.0015 inch. If the reading ex-
ceeds this figure, both valve and seat must be
refaced.
6-15. Cylinder Head Cleaning and Inspection
a. Cleaning.
(1) With the valves installed to protect the
valve seats, remove deposits from the combustion
chambers and valve heads with a scraper and a
wire brush.
CAUTION
Be careful not to damage the cylinder
head gasket surface.
(2) After valves are removed, clean the valve
guide bores with a valve guide cleaning tool.
(5) Check valve seat width, as shown in
Using cleaning solvent to remove dirt, grease and
between 0.060 and 0.080 inch, while exhaust
other deposits. clean all bolt holes.
valve seats should measure 0.070 to 0.090 inches.
(3) Remove all deposits from the valves with
Valve seats must be refaced if seat width is not
a fine wire brush or buffing wheel.
within specifications.
b. Inspection.
(1) Inspect the cylinder heads for cracks or
Change 1
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