Chrysler 1998 Voyager Service Manual page 1222

9 - 44 ENGINE
DIAGNOSIS AND TESTING (Continued)
ENGINE DIAGNOSIS—MECHANICAL
CONDITION
LUBRICATING OIL PRESSURE
LOW
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. Oil cooler was replaced, shipping
plugs left in cooler.
7. Worn oil pump.
8. Suction tube loose or seal
leaking.
9. Worn bearing or wrong bearing
installed.
10. Oil jets under piston loose or
bad fit.
1. External oil leaks.
2. Crankcase being overfilled.
3. Incorrect oil specification or
viscosity.
4. Oil cooler leak.
5. High blow-by forcing oil out the
breather.
CORRECTION
1a. Check and fill with clean engine
oil.
1b. Check for severe external oil
leaks that could reduce the
pressure.
2. Verify the correct oil is being
used. Check for oil dilution.
3. Verify the pressure switch is
functioning correctly. If not, replace
switch/gauge.
4. Check/replace valve.
5. Change oil filter. Oil filter change
interval may need to be revised.
6. Check/removed shipping plugs.
7. Check/replace oil pump.
8. Check and replace seal.
9. Inspect and replace connecting
rod or main bearings. check and
replace piston cooling oil jet.
10. Check oil jets position.
1. Visually inspect for oil leaks.
Repair as required.
2. Verify that the correct dipstick is
being used.
3a. Make sure the correct oil is
being used.
3b. Look for reduced viscosity from
dilution with fuel.
3c. Review/reduce the oil change
intervals.
4. Check and replace the oil cooler.
5. Check the breather tube area for
signs of oil loss.
NS/GS