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 TM 5-4320-258-34
KEY to fig. 4-22:
(3) Check cylinder bore wear with an inside
micrometer. Measure the cylinder bore at 45 intervals
below the travel of the lowest piston ring where the
1.
Oil gage rod
cylinder is not worn. Compare this measurement with a
2.
Oil gage rod support
measurement taken about 1/4 inch below the top of the
3.
Oil filler cap
cylinder. The maximum allowable cylinder wear (the
4.
Oil filler nipple
difference between these two measurements),is 0.008
5.
Nut
inch.
6.
Gasket
(4) Replace the block if, it is cracked, or if
7.
Valve chamber cover
defects cannot be repaired. Replace loose or damaged
8.
Gasket
studs. Retap damaged threads. If a proper piston fit
9.
Stud
cannot be attained, (para 4-10 c), the cylinders are
10.
Stud
scratched or scored, or, cylinder wear exceeds 0.008
11.
Cap screw
inch, rebore the cylinders as directed in d below.
12.
Lock washer
(5) Inspect the backing plate for cracks and
13.
Shoulder screw
distortion. Remove any burrs with a fine stone.
14.
Lock washer
(6) Inspect the oil pressure relief valve for
15.
Flywheel housing
scoring, wear, and other damage. Inspect the spring for
16.
Screw
cracks and misalined coils. Replace damaged oil
17.
Timing hole cover
pressure regulator parts.
18.
Felt
d. Reboring. Rebore the cylinders to 3.4575-
19.
Drive screw pointer
to 3.4595-inch diameter (0.020 inch oversize). If this is
20.
Housing plug
not sufficient to eliminate cylinder wear or damage,
21.
Lock washer
rebore the cylinders to 3.4775- to 3.4795-inch diameter
22.
Ring dowel
(0.040 inch oversize). Maximum allowable overbore is
23.
Plug
0.040 inch.
24.
Gasket
e. Reassembly and Installation.
25.
Relief valve spring
26.
Pressure adjusting washer
(1) Reassembly and installation is the
27.
Oil pressure relief valve
reverse of removal and disassembly. Refer to figure 4-
28.
Ring dowel
22.
29.
Ring dowel
(2) When installing the front end plate (22,
30.
Oil header plug
31.
Core hole plug
pounds torque and tighten the 3 / 8-inch bolts to 25 to 30
32.
Core hole plug
foot-pounds torque.
33.
Core hole plug
(3) Install the camshaft (para 4-12c).
34.
Baffle
(4) Install the crankshaft and main bearings
(para 4-11c).
35.
Cylinder block
(5) Install the pistons and connecting rods
b.
Cleaning.
(1) Remove dirt and grease deposits from
(6) Install the flywheel and flywheel
housing (para 4-9c).
the block with a putty knife. Steam-clean the block.
(7) Install the gear cover (para 4-8c).
Remove greasy or gummy deposits with a cloth
(8) Install the oil pump (para 4-7c) and oil
dampened in cleaning solvent (FED. Spec. P-D-680).
pan (para 4-6c).
Clean the oil and water passages in the block with
compressed air. Remove varnish deposits with a wire
(9) Install the intake and exhaust valves
brush.
45c).
(2) Clean the mounting plate and all other
(10) Install the cylinder head (para 4-3c).
parts with cleaning solvent (FED. Spec. P-D-680); dry
thoroughly.
(11) See paragraph 3-13 for oil pressure
c. Inspection.
adjustment procedure.
(1) Inspect the block for cracks, damaged
sealing surfaces, scored or damaged bearing seats,
scored or scratched cylinder walls, damaged threads,
loose or damaged studs, corrosion in the water jacket, or
other defects.
(2) Check piston fit in the cylinder bores
(para 4-10c).
4-28
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