TM 9-2320-387-24-l
DIAGNOSTIC FLOWCHART
r OPTIONS
DOES THE EXHAUST SMELL LIKE
RAW FUEL?
PUT A PIECE OF PAPER IN THE
EXHAUST STREAM THEN
LOOK AT AND SMELL IT FOR
SIGNS OF UNBURNT FUEL.
I
REASON FOR QUESTION
White smoke indicates fuel not
being burned in the cylinders, or
possible loss of coolant to the
exhaust.
FUEL SYSTEM
KNOWN INFO
I
WHITE SMOKE
INTERNAL ENGINE
PROBLEMS
FUEL QUALITY
r KNOWN INFO
TEST OPTIONS
VISUAL
WHITE SMOKE
DOES THE EXHAUST SMOKE
FOR MORE THAN 2 OR 3
MINUTES AFTER STARTING
THE ENGINE?
REASON FOR QUESTtON
Some white smoke after a cold start
is normal. The colder it is, the more
white smoke you’ll see. The glow
plugs keep cycling after the engine
starts which will reduce this smoking.
If you think that there is too much
smoke after a cold start, run the glow
plugs circuit tests (page 2-299)
paying special attention to the
afterglow operation.
POSSIBLE
PROBLEMS
INJECTION TIMING
INTERNAL ENGINE
PROBLEMS
FUEL QUALITY
RETURN CHECK VALVE
KNOWN INFO
ST OPTIONS
GLOW PLUGS CIRCUIT TESTS
(Page 2-289)
GLOW PLUGS OK
WHITE SMOKE
RUN THE GLOW PLUGS CIRCUIT
TESTS. IF NO FAULTS FOUND,
NOTIFY OS MAINTENANCE
(CHAPTER 14).
POSSIBLE
PROBLEMS
REASON FOR QUESTION
If the glow plugs are not
functioning properly, the cylinders
will not warm up as rapidly as
they should.
ENGINE MECHANICAL
2-126
