TM 9-2350-277-20-1
ENGINE OVERHEATS—Continued
0014 00
10Y
1. Allow system to remain at 13 to 15 psi pressure for five minutes.
2. Does pressure drop less than one psi?
YES
NO
10YN
1. Internal coolant system leak. Beyond
unit maintenance repair.
2. Notify supervisor.
11Y
1. Replace coolant pump (WP 0241 00).
2. Verify no faults found.
BY
1. Engage thermostatic fan speed switch (see your -10).
2. Does fan still fail to rotate?
YES
NO
BYN
1. Replace thermostatic fan speed
switch (WP 0231 00).
2. Verify no faults found.
B2Y
1. Stop engine (see your -10).
2. Remove ventilating fan drive belt (WP 0243 00).
3. Manually rotate ventilating fan drive shaft pulley (1).
4. Does fan spin freely?
YES
NO
B2YN
1. Faulty fan drive gearbox. Beyond
unit maintenance repair.
2. Notify supervisor.
0014 00-5
