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 TM 55-1905-223-24-3
Table 2-2. Troubleshooting-CONT
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
g.
Drain the oil from the oil pan, and remove the test gauge.
h.
Fill the oil pan with clean oil. Refer to PMCS Table 2-1, Item 15.
STEP 4.
Check for malfunctioning oil cooler bypass valve as follows:
a.
Remove the two capscrews and the bypass valve. Discard the O-ring.
b.
Visually inspect the valve for damage.
CAUTION
The flash point of new lubricating oil is approximately 430 (220 ). Do not allow oil
F
C
temperature in the container to exceed 300 (150 ). Do not allow water droplets to enter
F
C
the container of hot oil. Water droplets will cause a violent reaction which can cause
personal injury.
c. Suspend the valve and a 240 (115 ) thermometer in a container of new lubricating oil. Do not allow the
F
C
valve or the thermometer to touch the sides of the container.
d. Heat the lubricating oil.
NOTE
Write down the temperature at which the valve is fully extended. The valve must be fully
extended to at least 2.770 inches (70.36 mm) when the temperature reaches 234
F
(112 ).
C
e. Replace the valve if it does not operate as follows:
CAUTION
Do not install the O-ring on the control valve and then try to pull the control valve into
position with the capscrews. The sharp corners of the counterbore will cut the O-ring.
(1)
Lubricate the O-ring with vegetable oil, and install it in the oil cooler support.
(2)
Install the valve in the oil cooler support, and push it in position. Tighten the capscrews to 30 ft-
lb (40 N ) torque.
m
(3)
Operate the engine until the water temperature reaches 180 (80 ) and check for oil leaks.
F
C
9.
Lubricating oil in the coolant.
STEP 1.
Check if lubricating oil cooler is malfunctioning.
Repair or replace oil cooler (para. 2-34).
2-31
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