Dodge ram truck 3500 1996 Service Manual page 1009

BR —
ENGINE 9 - 19
D I A G N O S I S A N D T E S T I N G ( C o n t i n u e d )
SERVICE DIAGNOSIS—DIESEL—PERFORMANCE—CONT.
CONDITION POSSIBLE CAUSES CORRECTION
EXCESSIVE EXHAUST
SMOKE CONT.
10. improperly operating or
overfueled injector pump.
11. Piston rings not sealing (blue
smoke).
10. Repair or replace injection pump.
11. Perform blow-by check. Correct as
required.
ENGINE WILL NOT SHUT
OFF
1. Fuel shutoff solenoid or
solenoid relay inoperative.
2. Engine running on fumes
drawn into the air intake.
3. Fuel injection pump
malfunction.
1. Check/replace fuel shutoff solenoid or
relay.
2. Check the air intake ducts for the source
of fumes.
WARNING: In case of engine runaway
due to flammable fumes from gasoline
spills or turbocharger oil leaks being
sucked into the engine. Shut off engine
ignition switch first then use a C02 fire
extinguisher and direct the spray under
the front bumper to remove oxygen
supply. The engine air intake is on the
passenger side behind the bumper. The
fire extinguisher must be directed at this
location for emergency shutdown
conditions.
3. Repair or replace fuel injection pump.
COOLANT TEMPERATURE
ABOVE NORMAL
1. Low coolant level.
2. Incorrect/improperly operating
pressure cap.
3. Loose drive belt on water
pump/fan.
4. Inadequate air flow to the
radiator.
5. Radiator fins plugged.
6. Collapsed radiator hose.
7. Improperly operating
temperature sensor/gauge.
8. Improperly operating, incorrect
or no thermostat.
9. Air in the cooling system.
1. Check coolant level. Add coolant, if
necessary. Locate and correct the
source of the coolant loss, (refer to
Group 7, Cooling).
2. Replace cap with the correct rating for
the system.
3. Check/replace belt or belt tensioner.
4. Check/repair radiator core, fan shroud
and viscous fan drive as required.
5. Blow debris from fins.
6. Replace the hose. Check cap operation,
(refer to Group 7, Cooling System).
7. Verify that the gauge and temperature
sensor are accurate. Replace
gauge/sensor, if bad.
8. Check and replace the thermostat.
9. 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.
J9509-150