Section IX. COOLING SYSTEM

(1) Remove the four capscrews which fasten the battery

b. Shielded

Ignition

Lead

Replacement.

Disconnect the ignition leads (fig, 8-25) from the spark

charging receptacle (2, fig.

1-1) to the engine housing,

plug and magneto, one at a time. Install replacement

leads as the old leads are removed.

(2) Unplug the two cables connected to the receptacle,

348. Battery Charging Receptacle

(3) Remove the receptacle,

a. Removal

b. lnstallation.

Install the battery charging

receptacle (2, fig. 1-1) in the reverse order as noted

above (para 3-48a).

Section IX. COOLING SYSTEM

(10) Refer to figure 8-27 and remove water

3-49. General

pump.

The cooling system prevents the temperature in the

c. Installation. Install water pump in reverse order

engine combustion chamber from damaging the engine.

of removal.

Maintaining cooling system efficiency is important.

3-51. Thermostat

Engine temperature must be brought up to and

maintained within a satisfactory range for efficient

a. General. The thermostat controls the coolant

operation; overheating must be avoided,

temperature.

b. Removal.

3-50. Water Pump

(1) Perform all operations described in

paragraphs 3-49b(1) through 3-4q9b(5).

(2) Refer figure 3-28 and remove the

a. General. The water pump circulates the coolant

thermostat.

in the cooling system.

c. Test.

Refer to figure 3-29 and test the

thermostat.

b. Removal

d. Installation. Refer to paragraph 3-51l and install

(1) Drain coolant from system.

thermostat in reverse order.

(2) Refer to figure 8-1 and remove nuts (9),

washers (8), and lifting bail (7) from pumping unit.

3-52. Radiator

(3) Remove side panels. (fig. 8-80).

a. General. The radiator consists of a series of

(4) Refer to figure 8-57 and 8-58, remove

copper tubes through which the coolant is circulated. As

muffler guard and muffler.

it travels through these tubes it tends to radiate off the

(5) Refer to figure 8-60 remove capserews

excess heat.

(7), lockwashers (8), and hood (9) from pumping unit.

b. Inspection.

Inspect the radiator for leaks,

(6) Refer to figure 6-7 remove screws (8) and

cracks, and dents.

remove fan guard.

c. Service.

(7) Refer to figure 6-8 remove screws (24)

(1) Refer to figure 3-30 and reverse flush the

lockwashers (28) and fan (22),

radiator.

(8) Refer to figure 8-7 loosen adjusting nuts

(2) Refer to figure S-31 and reverse flush the

and remove fan belt.

engine water jacket.

(9) Refer to figure 8-8 loosen adjusting

3-53. Coolant Piping and Hoses

capers and remove generator belt.

Replacement refer to figure 3-32 and replace piping and

hoses as necessary.

3-25