Dodge dakota 2002 Service Manual page 1532

DR
ENGINE 5.9L DIESEL (Continued)
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING—ENGINE DIAGNOSIS - MECHANICAL
CONDITION
LUBRICATING OIL
PRESSURE LOW
LUBRICATING OIL
PRESSURE TOO HIGH
POSSIBLE CAUSES
1. Low oil level.
2. Oil viscosity thin, diluted or wrong
specification.
3. Improperly operating pressure
switch/gauge.
4. Relief valve stuck open.
6. If cooler was replaced, shipping
plugs may have been left in cooler
7. Worn oil pump.
8. Suction tube loose or seal leaking.
9. Loose main bearing cap.
10. Worn bearings or wrong bearings
installed.
11. Directed piston cooling nozzles
under piston, bad fit into main
carrier.
12. Loose oil rifle plug with saddle-jet
style nozzles
13. Loose directed piston cooling
nozzle.
14. Both J-jet and saddle jet style
cooling nozzle installed.
1. Pressure switch/gauge not
operating properly.
2. Engine running too cold.
3. Oil viscosity too thick.
4. Oil pressure relief valve stuck
closed or binding
ENGINE 5.9L DIESEL
CORRECTION
1. (a) Check and fill with clean engine oil.
(b) Check for a severe external oil leak that
could reduce the pressure.
2. (a) Verify the correct engine oil is being
used. (Refer to LUBRICATION &
MAINTENANCE/FLUID TYPES -
DESCRIPTION).
2. (b) Look for reduced viscosity from fuel
dilution.
3. Verify the pressure switch is functioning
correctly. If not, replace switch/gauge.
4. Check/replace valve.
6. Check/remove shipping plugs.
7. Check and replace oil pump.
8. Check and replace seal.
9. Check and install new bearing. Tighten
cap to proper torque.
10. Inspect and replace connecting rod or
main bearings. Check and replace directed
piston cooling nozzles.
11. Check directed piston cooling nozzles
position.
12.Tighten oil rifle plug.
13. Tighten directed piston cooling nozzle.
14. Install correct style jet.
1. Verify pressure switch is functioning
correctly. If not, replace switch/gauge.
2. Refer to Coolant Temperature Below
Normal (Refer to 7 - COOLING -
DIAGNOSIS AND TESTING).
3. Make sure the correct oil is being used.
(Refer to LUBRICATION &
MAINTENANCE/FLUID TYPES -
DESCRIPTION).
4. Check and replace valve.
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