RADIATOR PRESSURE CAP - TM-10-3930-644-14-P0083

TM 10-3930-644-14&P

2. If spacers were present between radiator

NOTE: Allow engine to reach normal

mounting flange and frame, be sure to replace in

operating

temperature.

The

their original locations.

Use spacers as

thermostat will then open and the

necessary to prevent fan from hitting radiator.

coolant will flow into the engine.

3. With radiator properly aligned, install two

Coolant level must then be "topped-

capscrews through radiator mount to frame

up."

support bars.

4. Install grille and secure grille and radiator with

8. Replace the side panels, and lower operator's

two capscrews. Secure grille with two remaining

seat.

capscrews. Install muffler and tail pipe section r

(ACP only).

D. RADIATOR PRESSURE CAP

A seven-pound pressure cap (Figure 2-3) is installed on

NOTE

the radiator filler neck. As long as there is pressure in

The oil cooler lines will have to be

the cooling system, the temperature can be considerably

reinstalled.

higher (over 220F) than the boiling point of the solution

5. Install upper and lower radiator hoses and

in the radiator at atmospheric pressure without causing

secure retaining clamps. If hoses are cracked or

the solution to boil. Removal of the radiator cap while

cut, they must be replaced.

the engine is hot and the pressure is high will cause the

solution to boil instantaneously and possibly with

6. After radiator is installed, measure distance

explosive force, spewing the coolant over the engine and

between the leading edge of the fan blades and

the person removing the cap. There is also the

the radiator core.

possibility of causing serious burns.

This dimension should be at least 7/8". Also

Pressure caps should be checked at least once a

ensure that the cooling fan is properly centered

year and care should always be taken in filling

within the radiator shroud.

radiators that no damage is done to the pressure

cap seat in the radiator filler neck.

7. Close the cooling system drain cock located

below the alternator and at bottom of radiator

CAUTION

(Figures 2-1 and 2-2).

Fill system to

When removing the filler cap, rotate

recommended capacity with coolant; replace

cap counterclockwise very slowly; if

pressure cap and check for any leaks.

hissing of vapor is encountered,

tighten cap immediately and wait for

system to cool sufficiently to allow

removal of cap.

After pressure in the system has been relieved, turn cap

counterclockwise and remove.

Turn cap clockwise when installing.

Cap must form a

tight seal to prevent any leakage.

Figure 2-2. Water Drain NOTE

Figure 2-3. Pressure Cap, Section View

M-155-1

2-42