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TM 5-4320-258-34
b.
Cleaning and Inspection.
gradually decreasing toward the ends. Check flatness
lengthwise at each edge and in the middle of the head.
(1) Remove all carbon from combustion
(5)  Check  flatness  crosswise  with  a
areas with a scraper and wire brush.
Clean all
straightedge and a feeler gage.
The maximum
remaining residue from the cylinder head with cleaning
permissible low spot is 0.003 inch in localized areas.
solvent (FED. Spec. P-D-680). Dry with clean, dry
Check flatness crosswise at each end and between each
compressed air.
combustion chamber.
(2) Clean the top of the cylinder block with
(6)  Inspect  cylinder  head  studs  for
a scraper and a cloth dampened in cleaning solvent
looseness or damaged threads.
(FED. Spec. P-D-680). Be very careful not to get dirt
(7)  Replace  the  gasket,  hoses,  and
in the cylinders or water jacket.
defective parts.
(3) Inspect the cylinder head for cracks,
c.  Installation.  Using a new head gasket,
corrosion, damaged threads, plugged water ports, or
install head in reverse order of removal. Tighten the
other defects.
cylinder head screws in the sequence shown in figure 4-
(4) Check flatness lengthwise with a
2. Torque to 35 to 40 foot-pounds.
straightedge  and  feeler  gage.
The  maximum,
permissible low spot is 0.012 inch in the center,
Figure 4-2. Cylinder head cap screw tightening sequence.
4-4.
Intake and Exhaust Valves
b.
Removal.
a.  General. The intake and exhaust valves of
(1) Remove the cylinder head (para 4-3).
(2) Remove the valve chamber cover (7,
this L-head engine are mounted in the cylinder block.
They are opened by operation of the camshaft through
(3) Using a spring lifter, compress the
adjustable valve tappets. They are closed by the valve
valve spring (5 or 10, fig. 4-3) at each valve (2 or 7)
springs. The valve stems ride in valve guides which are
and remove the valve locks (1 or 6) from each valve
pressed into the block. The intake valves seat directly
that is in the closed position.  Rotate the engine
in the block. The exhaust valve seat in shrink-fit valve
crankshaft to close the remaining valves and remove
seat inserts in the block.
the remaining locks.
4-6

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