Section XIII. MAINTENANCE OF ENGINE

TM 10-3930-633-12

radiator from the tank, Refer a leaking radiator to

(4) Install drain cock (12) and make certain it

direct or general support maintenance for repair.

is closed.

f. Radiator Installation. Refer to figure 4-33

(5) Refill cooling system with the proper

while installing radiator according to the

coolant solution. Complete refill requires 16

following procedures:

quarts. Start the engine and allow coolant to

(1) Install the radiator in position and secure

circulate to purge trapped air. Recheck coolant

radiator (21) and mounts (16) by installing bolts

level and add coolant as required.

(14), washers (17) and nuts (15).

(6) Install radiator pressure cap and check for

(2) Connect the transmission oil cooler lines

leakage. Check transmission fluid level, and add

to the ports at the bottom of the radiator.

fluid as required.

(3) Connect the upper and lower radiator

hoses (2) and (11) to the radiator inlet and outlet.

Section XIII. MAINTENANCE OF ENGINE

4-68. General

b. Check valve clearance and adjust as

required. See paragraph 4-71 for procedure.

The engine is a six cylinder, four cycle, overhead

c. Check closely for leakage at manifold and

valve industrial engine which runs on regular

cylinder block-to-cylinder head mating surfaces.

grade fuel. Engine displacement is 300 cubic

Leakage indicates a defective gasket or a crack or

inches. The engine is equipped with a 12 volt

other defect in the cylinder head or block.

electrical system including coil and distributor

type ignition. The engine features a single throat

4-71. Valve Clearance Adjustment

d o w n d r a f t carburetor with manual choke,

velocity governor, and a mechanical fuel pump.

Paragraph 4-71, and Figures 4-36 and 4-37 have

been rescinded.

4-69. Lubrication and General Maintenance

4-72. Cylinder Head Removal and Replacement

Lubrication services are covered in paragraph 3-3.

Maintenance procedures applicable to the fuel

Paragraph 4-72 and Figure 4-38 have been

system, electrical systetm, cooling system and

rescinded.

exhaust system are covered in their respective

(Page 4-56 has been rescinded.)

sections.

4-70. Cylinder Head and Valves Inspection

a. Every 1000 hours of operation, check

cylinder head bolts for proper torque, and tighten

as required. See paragraph 4-72 for cylinder head

bolts torque sequence.

Change 1

4-55/(4-56 Blank)