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 275 of 1417
G05: ENGINE WARMUP/COOLANT CHECK/OIL PRESSURE TEST - Continued
STEP
3.
Check oil pressure.
a.
Dial 10 into TEST SELECT and press TEST.
Table
1.
Engine RPM Test.
TEST NO.
TEST
10
Engine RPM
NOTE
If VTM does not display RPM, refer to Electrical Troubleshooting, to check DCA wiring
and pulse tachometer. Speeds given are approximate. If exact speed cannot be reached,
check oil pressure at closest possible speed.
b.
Increase engine speed to 2,100 RPM.
c.
Watch vehicle oil pressure gauge.
d.
Verify oil pressure is within the limits.
Table
2.
Engine Oil Pressure Specification.
Vehicle
Oil Pressure
M939/A1
55-75 PSI (379-517 kPa)
M939A2
30-80 PSI (207-552 kPa)
CONDITION/INDICATION
Is oil pressure within limits specified?
DECISION
YES - Perform G06: Governor Check/Power Test (WP
0193).
NO - Perform NG05: Low Oil Pressure Check (WP
0197).
END OF WORK PACKAGE
TM 9-2320-272-23-2
0192
0192-2
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