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 TM 10-3930-638-24&P
4-2. ENGINE MAINTENANCE (cont)
b. Cylinder Head and Valves (cont).
ITEM
REMARKS
ACTION
STEP
LOCATION
CLEANING (cont)
WARNING
Wear safety glasses when drying parts with compressed air. Fail-
ure to do so could cause serious injury to eyes and possible blind-
ness. If you hurt your eyes or if a foreign object is blown into
your eyes, seek medical attention immediately.
4
Cylinder head
a. Overall
Use cleaning solvent P-D-680. Dry
Clean
(8)
with moisture free compressed air
or clean cloth
Use fine rotary wire brush
b. Valve ports
Clean
c. Machined surface
Use medium grit emery cloth carefully
Clean
areas
to remove all gasket material, carbon
and rust
5
Use cleaning solvent P-D-680. Dry
All other parts
Clean
with moisture free compressed air
INSPECTION AND REPAIR
Valve spring (3)
6
Install in spring tester. Check that force
Inspect
to compress spring to 1.521 inch is
110 to 118 pounds; force to compress
spring to 1.875 inch is 53 to 59 pounds.
Replace spring if force is less than these
values
Cylinder head
a. Bottom surface
7
Check
Lay straight edge diagonally from corner
warpage
to corner and try to get a 0.006 inch
(8)
feeler gage under straight edge. Check at
several points. Reposition straight edge
at opposite corners and repeat checks.
If warpage is greater than 0.006 inch
resurface or replace cylinder head
NOTE
If cylinder head is resurfaced, maintain a minimum thickness of
3.968 inches.
Use bore gage and check in three places
b. Valve guides
Check inside
(9 and 10)
as shown below. Measure bore gage with
diameter
micrometer. If greater than 0.3449 inch
at any point replace valve guides
4-11
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