AIR CLEANER SERVICING

TM 10-3930-623-12

3. Adjustment.

at least 30 minutes. Stop the engine, remove radiator

cap, open radiator and cylinder block drain cocks and

a. Adjust governor linkage (para 4-15).

allow system to drain completely.

b. Loosen nut (12, fig. 5-2.1) and press accelerator

5-19. Neutralizing Cleaner in System. Close radiator

pedal to floor board. Adjust screw (13) until maximum

and cylinder block drain cocks. Pour inhibitor into

engine RPM (para 4-15) is reached.

radiator, fill system with clean, fresh water and install

radiator cap. Start engine at a fast idle, using radiator

c. Release accelerator pedal and tighten nut (12)

cover, if necessary, to bring engine operating

while holding screw (13) with another wrench.

temperature to at least 180 degrees F. Continue to

operate engine for at least ten minutes.

Remove

radiator cap, open radiator and cylinder block drain

cocks and allow system to drain completely.

5-20. Flushing System. Close radiator and cylinder

block drain cocks, Fill system with clean, fresh water and

install radiator cap. Start engine and operate at a fast

idle, using radiator cover as necessary to bring engine

operating temperature to at least 180 degrees F.

5-14. AIR CLEANER SERVICING. Refer to paragraph

Continue to operate engine for at least five minutes.

5-7.

Remove radiator cap, open radiator and cylinder block

drain cocks and allow system to drain. If water is

discolored to any extent, repeat this flushing operation.

5-15. COOLING SYSTEM MAINTENANCE.

5-16. CLEANING. To clean the cooling system of scale,

CAUTION

rust or sludge, use engine cooling system cleaning

compound and inhibitor meeting the requirements of

Do not flush system by inserting a

Military Specification MIL-C-10597. Be sure to flush

hose in the radiator with the engine

system thoroughly after cleaning as the cleaner contains

running and drain cocks open. This

a strong acid which, if not completely removed, may

procedure will close the thermostat

attack the parts of the cooling system.

and stop circulation of coolant

through the engine.

CAUTION

Do not pour cold coolant into the

radiator when engine temperature is

above 200 degrees F.

5-17. Draining System. Operate the engine at a fast

idle until normal engine operating temperature is

reached. A fast idle (about 1000-1200 rpm) will stir up

any loose rust, scale or other formations in the cooling

system. Stop engine and remove radiator filler cap.

Open cylinder block and radiator drain cocks and allow

cooling system to drain.

5-18. Cleaning System. Close radiator and cylinder

cocks. Be sure temperature of engine is below 200

degrees F. Pour cleaning compound into radiator and fill

coolant system with water. Install pressure type cap on

radiator. Start engine and operate it at fast idle until

solution is heated to at least 180 degrees F. Use a

Figure 5-3. Measuring Tappet Clearance

cardboard to cover radiator, if necessary, but do not

allow the solution to boil. Continue to operate the engine

5-3