ARMY TM 9-6115-670-14&P
4-48
TEST
a. Check that radiator sub-assembly has sufficient coolant (para 3.8.).
b. Start APU (para 2.5.), warm up the engine, then shut it down (para 2.6.).
c. After coolant has cooled sufficiently to open the radiator cap safely, but is still warm, remove the
radiator cap and install radiator tester.
d. Raise the water pressure to 23 PSI (158.58 kPa) and check for leaks.
e. If pinhole size leaks are observed, repair with sealing compound. If leaks are excessive, replace
radiator.
REPAIR
Refer to para 4.20., Radiator Coolant Drain Valve, for repair of radiator sub-assembly.
REPLACE
a. Drain coolant from radiator subassembly (para 4.19.).
b. Remove radiator hoses (para 4.24.).
c. Remove fan guard, shroud housing, and fan shroud (para 4.18.).
d. Remove two nuts and flat washers (2, Figure 4-6), two rubber washers (3), and two bolts and lock
washers (4) securing radiator (1) to radiator mount (5). Remove radiator (1).
e. Install new radiator (1) on radiator mount (5) and secure with two bolts and two flat washers, two
lock washers and nuts (4), two rubber washers (3), and two nuts and flat washers (2).
WARNING
Hot coolant is under pressure. Do not remove radiator
cap when engine is hot. Allow engine to cool completely
before removing radiator cap. Once cooling has
occurred, loosen cap slightly to relieve any excess
pressure before removing the cap completely. Failure to
observe this warning could result in burns or injury to
personnel.
