Dodge RAM 1500 1998 Owner's Manual page 1457

9 - 234 ENGINE 5.9L DIESEL
ENGINE 5.9L DIESEL (Continued)
CONDITION
LUBRICATING OIL LOSS
COMPRESSION KNOCKS
EXCESSIVE VIBRATION
POSSIBLE CAUSES
2. Engine running too 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.
4. Oil cooler leak
5. High blow-by forcing oil out the
breather.
6. Turbocharger leaking oil to the air
intake.
1. Air in the fuel system.
2. Poor quality fuel or water/gasoline
contaminated fuel.
3. Engine overloaded.
4. Improperly operating injectors.
1. Loose or broken engine mounts.
2. Damaged fan or improperly
operating accessories.
3. Improperly operating vibration
damper
4. Improperly operating electronically
controlled viscous fan drive.
5. Worn or damaged generator
bearing.
6. Flywheel housing misaligned.
CORRECTION
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.
4. Check and replace the oil cooler.
5. Check the breather tube area for signs of
oil loss. Perform the required repairs.
6. Inspect the air ducts for evidence of oil
transfer. Repair as required.
1. Identify location of air leak and repair. Do
not bleed high pressure fuel system.
2. Verify by operating from a temporary
tank with good fuel. Clean and flush the
fuel tank. Replace fuel/water separator filter.
3. Verify the engine load rating is not being
exceeded.
5. Check and replace misfiring/inoperative
injectors.
1. Replace engine mounts.
2. Check and replace the vibrating
components.
3. Inspect/replace vibration damper.
4. Inspect/replace fan drive.
5. Check/replace generator.
6. Check/correct flywheel alignment.
DR