Cleaning and Inspection. - TM-10-3930-634-120051

TM 10-3930-634-12

of the radiator.

(2) Remove the engine hood (para. 4-70). Refer to

figure 4-10 and remove the thermostat housing and

thermostat.

b. Cleaning and Inspection.

(1) Clean the thermostat housing seat and gasket

surface.

(2) Inspect the thermostat for an accumulation of

rust and corrosion.

c. Testing. Check operation of thermostat. If ther-

mostat remains closed, overheating of engine will

result. If thermostat remains open, engine may not

reach normal operating temperature, resulting in in-

complete fuel combustion and carbon buildup. To check

operation of the thermostat, suspend it and a ther-

mometer in a container of water. Do not let the ther-

mometer or thermostat touch the bottom or sides of the

container. Heat the water and agitate to maintain an

even temperature. As water is heated, the thermostat

should begin to open at 160 to 170F., and should be

fully open at approximately 190F.

d. Installation.

(1) Affix a new gasket to thermostat housing and

seat thermostat in housing so that the spring (or

bellows is down or toward the hot water side with the

unit bolted to the cylinder head.

(2) Refer to figure 4-10 and install thermostat

housing and hose.

TA031849