Test -706880528

TM 5-4210-233-14&P-1

4-136. THERMOSTATS-Continued

(2) Loosen two hose clamps (4) and disconnect hose (5) from water pump.

(3) Remove bolts (6) and lockwashers (7) securing covers (8) and (8A) to thermostat housings (9) and

(9A).

(4) Remove gaskets (1 0) and scrape any gasket residue from thermostat housings (9) and (9A) and

covers (8) and (8A).

(5) Remove seals (1 1) from thermostat covers (8) and (8A) and discard.

(6) Remove thermostats (12) from thermostat housings (9) and (9A).

(7) Clean the thermostat sealing surfaces in the thermostat housings (9) and (9A) and covers (8) and (8A).

b. Test.

(1) Immerse thermostats (1) in a container of heating water.

(2) Place thermostats (2) in container.

CAUTION

Keep thermometer (2) from touching bottom

of container. Failure to do so will result in

inaccurate readings.

(3) Stir water to maintain even temperature.

(4) When thermostats (1) start to open, and again

when it's fully open, observe water temperature

as indicated on thermometer.

(5) Water temperature observed in step (4) should

match temperature range stamped on

thermostats (1). Opening temperature is

approximately 180-F (82'C), and fully open

temperature is 197-F (92'C), allow at least 1 0

minutes for thermostat to react.

(6) If thermostats do not operate at specified temperatures,

replace thermostat(s).

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