TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 366 of 1313
EXCESSIVE OIL CONSUMPTION - Continued
STEP
2.
IS OIL LEAKING FROM ENGINE?
a.
Wipe off edges of rocker arm cover, oil pan, screws, oil filters and other external engine surfaces.
T0385DAA
Oil Filter
Figure 2.
Engine.
b.
Start engine and observe for leaks.
c.
If an oil leak is seen, tighten nuts, screws, and oil filters as needed, and again observe for leaks.
CONDITION/INDICATION
IS OIL LEAKING FROM ENGINE?
DECISION
YES - Rocker arm cover(s) leak. Replace leaking gasket(s) M939A2 (Volume 2, WP
0222). Go to Step (4) to
verify problem is solved.
YES - Oil pan is leaking. Replace oil pan gasket M939/A1 (Volume 2, WP
0231),
M939A2 (Volume 2, WP
0230). Go to Step (4) to verify problem is solved.
YES - Oil filter is leaking. Replace oil filter (Volume 2, WP
0232). Go to Step (4) to verify problem is solved.
NO - Go to Step (3).
TM 9-2320-272-23-1
0016
0016-3
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