Dodge 2001 Ram 1500 Owner's Manual page 1379

9 - 232 ENGINE 5.9L DIESEL
ENGINE 5.9L DIESEL (Continued)
DIAGNOSIS AND TESTING—ENGINE DIAGNOSIS - MECHANICAL
CONDITION
LUBRICATING OIL
PRESSURE LOW
LUBRICATING OIL
PRESSURE TOO HIGH
LUBRICATING OIL LOSS
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.
5. Plugged oil filter.
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. Oil jet under piston bad fit into
main carrier.
1. Pressure switch/gauge not
operating properly.
2. Engine running to cold.
3. Oil viscosity too thick.
4. Oil pressure relief valve stuck
closed or binding
1. External leaks.
2. Crankcase being overfilled.
3. Incorrect oil specification or
viscosity.
CORRECTION
1. (a) Check and fill with clean engine oil.
(b) Check for a severe external oil leak that
could reduce the pressure.
2. Verify the correct engine oil is being
used. (Refer to LUBRICATION &
MAINTENANCE/FLUID TYPES -
DESCRIPTION).
3. Verify the pressure switch is functioning
correctly. If not, replace switch/gauge.
4. Check/replace valve.
5. Change oil filter.
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 piston
cooling nozzles.
11. Check oil jet position.
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.
1. Visually inspect for oil leaks. Repair as
required.
2. Verify that the correct dipstick is being
used.
3. (a) Make sure the correct oil is being
used (Refer to LUBRICATION &
MAINTENANCE/FLUID TYPES -
DESCRIPTION).
(b) Look for reduced viscosity from dilution
with fuel.
(c) Review/reduce oil change intervals.
BR/BE