Cleaning - TM-5-4320-234-340088

TM 5-4320-234-34

measurement taken about 1/4 inch (0.625 cm) below

39, and 40) to ensure that the cylinder block oil and

the top of the cylinder. The maximum allowable

coolant passages will be properly cleaned.

cylinder wear (the difference between these two

b. Cleaning

measurements) is 0.008 inch (0.0200 cm).

(4) Replace the block if it is cracked, or if

WARNING

defects cannot be repaired. Replace loose or damaged

Clean all parts in a well-ventilated area.

studs. Retap damaged threads. If a proper piston fit

Avoid inhalation of solvent fumes and

cannot be attained (para 4-9c), the cylinders are

prolonged exposure of skin to cleaning

scratched or scored, or cylinder wear exceeds 0.008

solvent. Wash exposed skin thoroughly.

inch, replace the cylinder block.

Dry cleaning solvent (Fed. Spec. P-D-680)

(5) Inspect the front end plate for cracks and

used to clean parts is potentially dangerous

distortion. Remove any burrs with a fine stone.

to personnel and property. Do not use near

(6) Inspect the oil pressure relief valve for

open flame or excessive heat. Flash point of

scoring, wear, and other damage. Inspect the spring for

solvent is 100 F. to 138 F. (38 C. to 59 C.).

cracks and misalined coils. Replace damaged oil

pressure regulator parts.

(1) Remove dirt and grease deposits and all

d. Reassembly.

traces of old gasket material from flywheel housing (15,

(1) Reassembly is the reverse of removal and

fig. 4-21), valve chamber cover (7) and cylinder block

disassembly. Refer to figure 4-21.

(41), using a putty knife, gasket scraper or wire brush

(2) When installing the front end plate (19,

and dry cleaning solvent (Fed. Spec. P-D-680).

fig. 48), tighten the 3/8-inch bolts to 25 to 30 foot-

Steam-clean these pieces and boil out the block to

pounds (3.457 to 4.149 kgm) torque and tighten the

remove deposits from the coolant passages. Blow out

7/16-inch bolts to 50 to 55 foot-pounds (6.915 to 7.606

oil passages in the cylinder block and check that they

kgm) torque.

are not restricted.

(3) Install the camshaft (para 4-11c).

(2) Clean all other metal pieces with dry

(4) Install the crankshaft and main bearings

cleaning solvent (Fed. Spec. P-D-680), and allow all

(para 4-10c).

pieces to dry thoroughly before reassembly.

(5) Install the pistons and connecting rods

c. Inspection.

(para 4-9c).

(1) Inspect the block for cracks, damaged

(6) Install the flywheel and flywheel housing

sealing surfaces, scored or damaged bearing seats,

(para 4-8c).

scored or scratched cylinder walls, damaged threads,

(7) Install the gear cover (para 4-7c).

loose or damaged studs, corrosion in the water jacket, or

(8) Install the oil pump (para 4-6c) and oil pan

other defects.

(para 4-5c).

(2) Check piston fit in the cylinder bores (para

(9) Install the intake and exhaust valves (para

49c).

44d).

(3) Check cylinder bore wear with an inside

(10) Install the cylinder head (para 4-3c).

micrometer. Measure the cylinder bore at 45 intervals

(11) See paragraph 3-15 for oil pressure

below the travel of the lowest piston ring where the

adjustment procedure.

cylinder is not worn. Compare this measurement with a

4-22