(12) that secure the cover (9) to the cylinder block;
below the travel of the lowest piston ring where the
remove the cover and gasket (10).
cylinder is not worn. Compare this measurement with a
measurement taken about 1/4 inch below the top of the
cylinder. The maximum allowable cylinder wear (the
difference between these two measurements) is 0.008
Dry cleaning solvent, P-D-680, used to clan parts
Replace the engine assembly if the block is
Is potentially dangerous to personnel and
cracked, or if defects cannot be repaired. Replace loose
property. Avoid repeated and prolonged skin
or damaged studs. Retap damaged threads. If a proper
Do not use near open flame or
excessive heat. Flash point of solvent Is 100° F.
piston fit cannot be attained (para 9-29), the cylinders are
- 138° F. (39° C. - 59° C.).
scratched or scored, or cylinder wear exceeds 0.008
inch, rebore the cylinders as directed in paragraph 9-42
Inspect the backing plate for cracks and
Remove dirt and grease deposits from the
distortion. Remove any burrs with a fine stone.
block with a putty knife.
Steam-clean the block.
Inspect the oil pressure regulating valve for
Remove greasy or gummy deposits with a cloth
scoring, wear, and other damage. Inspect the Spring for
dampened in cleaning solvent P-D-680. Clean the oil
cracks and misaligned coils. Replace damaged oil
and water passages in the block with compressed air.
pressure regulator parts.
Remove varnish deposits with a wire brush.
Clean the mounting plate and all other metal
parts with cleaning solvent P-D-680 and dry thoroughly.
Rebore the cylinders to 3.2700 to 3.2720 inch
diameter (0.020 inch oversize). If this is not sufficient to
eliminate cylinder wear or damage, rebore the cylinders
Inspect the block for cracks, damaged sealing
to 3.2900 to 3.2920 inch diameter (0.040 inch oversize).
surfaces, scored or damaged bearing seats, scored or
Maximum allowable overbore is 0.040 inch.
scratched cylinder walls, damaged threads, loose or
damaged studs, corrosion in the water jacket or other
Reassembly and Installation
Reassembly and installation is the reverse of
Check piston fit in the cylinder bores (para 9-
removal and disassembly. Refer to figure 9-26.
Check cylinder bore wear with an inside
micrometer. Measure the cylinder bore at 45° intervals