TM 9-2350-256-20
CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
2 - 1 6 . 1 M E C H A N I C A L T R O U B L E S H O O T I N G - C o n t i n u e d
E N G I N E - C o n t i n u e d
Q
If during battery test battery voltage was below 12
volts and starter still tried to turn over engine,
starter protection module may be defective,
troubleshoot engine starter circuit (see paragraph 2-
19). Replace starter module if defective (see
paragraph 6-3).
R
Check engine for proper grade of oil. If wrong grade
of oil for prevailing temperature is in engine do the
following: Use external means to heat engine
compartment. After engine starts, run it until engine
reaches operating temperature. Drain engine and/or
transmission and fill with proper grade of oil for
prevailing temperatures as specified in TM 9-2350-
256-10.
S
While assistant engages starter, listen at vehicle right
rear cooling air inlet grilles for a spinning noise. If
spinning noise is present, replace starter assembly
(see paragraph 6-3).
F U E L , A I R I N T A K E , A N D E X H A U S T S Y S T E M S
SYMPTOMS
Engine starts running but fails to
stay running.
Do steps A through E.
Engine fails to shut off when
engine fuel shutoff switch is
activated.
Do step F.
Engine fails to stop when fuel
shutoff handle is pulled.
Do step G.
Engine stalls at low rpm, does not
develop full power, and has
excessive smoke from one or both
banks of cylinders.
Do steps H and I.
Engine stalls at low rpm and does
not delvelop full power, but
exhaust smoke is normal.
Do steps J through M.
Engine runs rough or misfires,
knocks, and/or fuel consumption
is excessive.
Do step N.
A
With MASTER switch and in-tank fuel pump switch
in ON position, electric fuel pump will make a noise.
If there is no noise, troubleshoot electric fuel pump
circuit (see paragraph 2-19). If there is noise go to
step L and perform fuel flow test.
B
Disconnect fuel line connecting primary fuel filter
and main fuel check valve at main fuel check valve.
Place fuel line in a suitable container. Place MASTER
and fuel pump switches in ON position. If there is
no fuel flow, clean filter and/or replace the prirmary
fuel filter element (see paragraph 4-14).
2-40.4
Change 1
