TM 10-3930-669-20 VISUAL INSPECTION (1) Start engine (TM 10-3930-669-10). (2) Check engine temperature gauge. (a) If   engine   temperature   is   not above  195°F  (90.56°C),  go  to Step (3) below. (b) If engine temperature is above 195°F (90.56°C), perform Step (3)    below    and    go    to    Axle Troubleshooting, Fault 1. (3) Shut down engine. (4) Remove   drive   axle   check/fill   plug (Para 10-1). (5) Inspect for signs of overheating. (a) If drive axle is overheating, go to  Axle  Troubleshooting,  Fault 1. (b) If drive axle is not overheating, axle temperature is OK. (6) Install drive axle check/fill plug. BRAKE DISC CHECK (1) Measure brake disc gap. (a) If  brake  disc  gap  is  not  0.079 in.    (2    mm)    or    less,    brake discs    are    faulty.        Perform Step  (2)  below  and  notify  DS Maintenance. (b) If  brake  disc  gap  is  0.079  in. (2  mm)  or  less,  brake  discs are OK. (2) Install drive axle check/fill plug (LO 10-3930-669-12). 2-393