Section X. MAINTENANCE OF THE COOLING SYSTEM

d. Installation.

(3) Raise left side of the truck to reach the

muffler which is located underneath the floor plate.

(1) Install the grommets (3) in muffle

(4) To remove the exhaust pipe (7), loosen

mounting bracket and secure muffler (1) to truck frame

the clamp (6) securing the pipe to the muffler (1) and

with two screws (2), lock washers (4) and nuts (5).

remove the two bolts (8) and washers (9) mounting the

(2) Secure exhaust pipe (7) to muffler with

exhaust pipe to the manifold.

clamp (6), and using new gasket (10), secure to

(5) To remove tailpipe (12), loosen clamp

manifold with two bolts (8) and washers (9).

(11) securing the pipe to the muffler and remove the

(3) Secure tailpipe (12) to muffler (1) with the

clamp (16) securing the tailpipe to the truck frame.

clamps (11 & 16).

(6) To remove muffler, disconnect exhaust

(4) Slide sleeve extension (17) through

pipe (7) and tailpipe (12) and remove the two screws (2),

counterweight opening onto open-end of tailpipe. Push

nuts (5) and lockwashers (4) securing it to the truck

sleeve all the way onto tailpipe, to secure it in position.

frame. Remove the two grommets (3) from muffler

(5) Inspect all connections for exhaust leaks.

mounting bracket.

(6) Install left hand engine side panel, driver's

c. Inspection. Inspect all the components of the

seat and secure radiator grille to truck frame with

capscrews, lockwashers and washers.

exhaust system for corrosion, leaks, or damage.

Replace defective parts.

Section X. MAINTENANCE OF THE COOLING SYSTEM

4-27. General

The cooling system cools the engine, torque

converter, and transmission. The system consists of the

radiator, thermostat, fan, water pump, and hoses.

Engine coolant is circulated by the water pump through

the engine to the radiator where it is cooled. The

radiator is cooled by the flow of air circulated by the fan.

When the engine coolant is below operating

temperature, the thermostat closes, preventing the

circulation of coolant through the radiator until the

coolant reaches the proper temperature.

Torque

converter and transmission oil is transferred through

hoses to the lower part of the radiator where it is cooled.

4-28. Radiator

a. Cleaning.

(1) Clean foreign matter from the cooling fins

by forcing compressed air through the radiator from the

counterweight toward the engine.

(2) Flush the cooling system with a chemical

cleaner in accordance with current directives. After

flushing, fill the cooling system with anti-freeze solution

(table 2-1) containing a rust inhibitor or water and rust

inhibitor in accordance with current directives.

(3) If the cooling system is badly clogged with

rust and scale, reverse flush the radiator and engine as

follows:

(a) Drain the cooling system.

(b) Loosen the clamps and disconnect

Figure 4-15. Reverse flushing the radiator.

the upper and lower radiator hoses.

(c) Connect the flushing gun to the

(d) Remove the bypass hose from the

lower hose as shown in figure 4-15. Fill the radiator with

elbow on the thermostat housing and water pump.

water. Shut off the water supply and blow the water out

Install a plug in the elbow on the thermostat housing.

of the radiator with air. Apply air pressure gradually to

Refer to figure 4-17.

prevent damage to the radiator. Repeat this process

until the flushing stream runs clear. Disconnect the

flushing gun.

4-22