Chrysler 1991 Service Manual Supplement page 73

9 - 10 5.9L (DIESEL) ENGINES
SERVICE DIAGNOSIS • PERFORMANCE (CONT.)
CONDITION POSSIBLE CAUSES
CORRECTION
EXCESSIVE EXHAUST
SMOKE (Cont'd)
More than one sealing washer
under an injector.
Check and remove extra washer.
Improperly operating injectors. Check and replace inoperative injectors.
Improperly operating or over-
fueled injection pump.
Replace injection pump.
Piston rings not sealing
(blue smoke).
Perform blow-by check. Correct as required.
ENGINE WILL NOT
SHUT-OFF
Fuel shutoff valve inoperative. Stop the engine mechanically with lever on the fuel pump.
Check/replace sealing washer, piston and spring.
Engine running on fumes drawn
into the air intake.
Check the air intake ducts for the source of the fumes.
TO STOP AN ENGINE THAT IS RUNNING ON FUEL SOURCES
OTHER THAN THE DIESEL FUEL INJECTION SYSTEM, SPRAY A FIRE
EXTINGUISHER INTO THE AIR INTAKE SYSTEM. THE AIR PICKUP IS
LOCATED BELOW THE RIGHT HEAD LIGHT (PASSENGER SIDE)
BEHIND THE BUMPER.
COOLANT TEMPERA-
TURE ABOVE NORMAL
Low coolant level. (a) Check coolant level. Add coolant, if necessary.
(b) Locate and correct the source of the coolant leak. Refer to
troubleshooting logic for coolant loss.
Incorrect/improperly operating
pressure cap.
Replace cap with the correct rating for the system.
High lube oil level.
Check/drain oil to correct level.
Loose drive belt on water
pump/fan.
Check/replace belt or belt tensioner.
Inadequate air flow to the
radiator.
Check/repair radiator core, fan shroud and fan clutch as
required.
Radiator fins plugged. Blow debris from fins.
Collapsed radiator hose. Replace the hose.
Improperly operating tempera-
ture sensor/gauge.
Verify that the gauge and temperature sensor are accurate.
Replace gauge/sensor, if bad.
Improperly operating, incorrect
or no thermostat.
Check and replace the thermostat.
Air in the cooling system. (a) Make sure the fill rate is not being exceeded and the correct
vented thermostat is installed.
(b) Check for loose hose clamps. Tighten if loose.
(c) If aeration continued, check for a compression leak through
the head gasket.
Inoperative water pump. Check and replace the water pump.
Incorrect injection pump timing.
Verify pump timing marks are aligned. Check/time the injector
pump (refer to Group 7, Cooling System).
J9109-236