TM-9-2320-272-23-2

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-2 - Page 274 of 1417

FIELD MAINTENANCE

G05: ENGINE WARMUP/COOLANT CHECK/OIL PRESSURE TEST

INITIAL SETUP:

Personnel Required

(2)

References

Volume 1, WP

0028

References (cont.)

WP

0193

WP

0197

WP

0200

TROUBLESHOOTING PROCEDURE

G05: ENGINE WARMUP/COOLANT CHECK/OIL PRESSURE TEST

STEP

1.

Check for leaks and coolant temperature.

a.

Check vehicle for oil, fuel, and coolant leaks.

b.

Refer to appropriate maintenance section to repair any leaks.

c.

Warm up engine to normal operating temperature 175°F to 200°F (79°C to 93°C).

CONDITION/INDICATION

Does temperature gauge read within limits above after a normal warmup period?

DECISION

YES - Go to Step (3).

NO - Go to Step (2).

STEP

2.

Engine temperature.

Check engine temperature gauge indicates normal operating temperature.

CONDITION/INDICATION

Is temperature too high?

DECISION

YES - Perform Engine Overheats troubleshooting, (Volume 1, WP

0028) after completing repairs rerun GO-

Chain tests. If no problems are found, perform NG31: Gauge Test (WP

0200).

NO - Perform NG31: Gauge Test (WP

0200).

TM 9-2320-272-23-2

0192

0192-1