Section IX. Cooling System

Section

IX.

COOLING

SYSTEM

4-30. General

(1) Open drain cocks in radiator and engine

The cooling system components covered in this

block. Drain cooling system.

s e c t i o n are located at the front of the engine

(2) Remove upper radiator hose (para 4-30 b).

compartment.

(3) Release hose clamp on bypass hose (fig. 4-

6), and work hose free from water outlet elbow.

4-31. Radiator Hoses

a. Inspection.Inspect upper radiator hose (fig. 4-

(4) Remove cap screws securing water outlet

6) and lower radiator hose (fig. 4.10) for cracks,

elbow to cylinder head.

b u l g e s , or deterioration. Also carefully inspect

( 5 ) Remove gasket (18, fig. 4-12). Discard

connections between hoses and engine and between

gasket.

hoses and radiator for evidence of coolant leakage.

(6) Remove thermostat (19) and thermostat

Tighten hose clamps if leakage is occuring.

gasket (20). Discard gasket.

b. Removal (Either Radiator Hose).

b. Testing.

(1) Open drain cocks in radiator and engine

(1) Suspend thermostat in a container of water

so that it does not touch the bottom of the con-

block. Allow system to drain.

tainer.

( 2 ) Loosen hose clamps and slide toward

center of hose.

(2) Heat water and check temperature with a

thermometer. The thermostat valve should start to

(3) Grasp hose firmly and pull from engine

open at about 1570 F., and should be fully open at

and radiator connections.

183 F.

c. Installation. To install radiator hose, reverse

the above removal procedure. Be sure to check for

(3) If the thermostat opens before the water

temperature reaches 157 F., or does not open

coolant leakage after starting engine and full warm

until after the water temperature reaches 183 F.,

up.

it should be replaced.

4-32.

Thermostat

c. Installation. Reverse procedure in a a b o v e

a. Removal.

using new gaskets (18 and 20).

4-15