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TM 10-3930-664-24
C.
INSPECTION
1.
Inspect cylinder head and related components
in accordance with paragraph 1-24.
2.
Inspect coolant passages for blockage. A large build
up of rust and lime will require removal of cylinder
block for cleaning in a hot tank.
3.
Inspect cylinder bores for damage and excessive
wear. Manually rotate crankshaft so that the piston
for bore being inspected is at bottom of bore.
4.
Measure cylinder bores as follows (refer to figure):
a.
Maximum bore I.D. shall be 4.0203 in. (102.116
mm).
b.
Out of round shall not exceed .0015 in. (.038
mm).
c.
Taper shall not exceed .003 in. (.076 mm).
5.
Check top surface of cylinder block for damage
caused by leaking cylinder head gasket.
6.
Check top surface of cylinder block for flatness
between cylinders. Variance shall not exceed .002
in. (.050 mm).
7.
Do not proceed with cylinder head replacement
if crankcase is damaged or tolerances in steps 4 and
6 are not met. Remove engine from service and
send to depot maintenance shop for overhaul.
D.
INSTALLATION
1.
Mate new gasket (5) to engine cylinder block (2).
Ensure gasket fits properly over cylinder block
dowels.
2.
Carefully install cylinder head (1) onto dowels.
3.
Lubricate threads of screws (3, 4) with oil. Install four
screws (3) and ten screws (4) to secure cylinder
head (1). Hand tighten screws.
3-34
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