TM-9-2815-210-34-2-1
ENGINE ASSEMBLY, DIESEL (MULTIFUEL): NATURALLY ASPIRATED OR TURBOCHARGED, FUEL-INJECTED, WATER-COOLED, 6-CYLINDER
TECHNICAL MANUAL; TROUBLESHOOTING; DIRECT SUPPORT AND GENERAL SUPPORT LEVEL; VOLUME 2 OF 2; PART 1 OF 2
APRIL 1981
TM-9-2815-210-34-2-1 - Page 31 of 259
TM 9-2815-210-34-2-1
b .
Run the engine at low idle speed (5 minutes minimum for fuel mixing) until
water temperature reaches 120°F.
Higher water temperatures are acceptable. How-
ever, the misfiring described below may go away as the engine reaches operating
temperature.
c .
With engine at idle speed and transmission in neutral, attempt to accelerate to
rated engine speed.
Rated engine speed is 2,600 rpm for all models except
LDS-465-2 (M656 Series Trucks), which is 2,800 rpm.
Smooth, rapid acceleration to
rated speed without misfire shows that fuel is good as is. If this condition is not
met, addition of diesel fuel is required (up to 30 percent diesel fuel may be
necessary).
NOTE
Misfire at higher than rated engine speed is good
while performing the above test.
d. Other reasons for the addition of diesel fuel that may happen during normal
operation are:
(1) Not being able to accelerate a warm ( 120°F. minimum water temperature)
engine under light loads.
(2) Popping in the exhaust system when accelerating after going down a
long down grade.
(3) Popping in the exhaust system when shifting transmission.
NOTE
Vehicles wit h two tank fuel systems:
If unknown, or low octane fuel is added to both
tanks, the secondary tank must have the same
amount of diesel fuel added to the primary tank
plus an additional 10 gallons of diesel fuel.
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