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TM 5-4320-313-14
5-9. CYLINDER HEAD AND VALVE ASSEMBLY - Continued.
b. Cleaning.
WARNING
Do not breathe cleaning solvent P-D-680 vapors for long periods of time or use solvent near open
flames. To avoid illness, explosion, or fire, only use solvent in well-ventilated areas away from open
flames.
(1) Clean cylinder head with a clean rags dampened with cleaning solvent.
(2) Allow cylinder head to dry.
c. Inspection.
(1) Inspect cylinder head for cracks or signs of excessive heat.
(2) Using a straight edge, check cylinder for warpage.
(3) Inspect cylinder head contact surface for damage.
(4) Replace a damaged cylinder head.
d. Installation. (Refer to figure 5-21).
CAUTION
Too small a clearance will damage piston, cylinder head, and valves. Too large a clearance will result in
difficult starting.
NOTE
Prior to installing cylinder head, check the clearance between cylinder head and piston top to obtain
cylinder head gasket thickness requirements.
(1) Bring piston to Top Dead Center (TDC) position. Install retaining bracket and secure with two cylinder head
mounting nuts. Tighten nuts securely.
(2) Insert depth gauge (1) and measure distance between top of the cylinder and top of piston.
(3) Subtract reading on depth gauge from the required clearance of 0.0216/ 0.0255 inch (0.55/0.65 mm). The
difference is the thickness of the gasket required for proper cylinder head clearance.
NOTE
If you have a choice between using either one of two thickness of gaskets, use the thicker of the two.
5-32
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