Jeep 200 Cherokee Service Manual page 1259

9 - 10 ENGINE
DIAGNOSIS AND TESTING (Continued)
CONDITION
LUBRICATING OIL LOSS
COMPRESSION KNOCKS
EXCESSIVE VIBRATION
2000 JEEP CHEROKEE
POSSIBLE CAUSES
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.
7. Piston rings not sealing (oil being
consumed by the engine).
1. Air in the fuel system.
2. Poor quality fuel or water/gasoline
contaminated fuel
3. Engine overloaded.
4. Incorrect injection pump timing.
5. Improperly operating injectors.
1. Loose or broken engine mounts.
2. Damaged fan or improperly
operating accessories.
3. Improperly operating vibration
damper.
4. Improperly operating viscous fan
drive.
5. Worn or damaged generator
bearing.
6. Flywheel housing misaligned.
7. Loose or broken power component.
8. Worn or unbalanced driveline
components.
CORRECTION
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.
(B) Look for reduced viscosity from
dilution with fuel.
(C) Review/reduce the 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.
7. Perform blow-by check. Repair as
required.
1. Bleed the fuel system (refer to
Group 14, Fuel System).
2. Verify by operating from a temporary
tank with good fuel. Clean and flush
the fuel supply tanks. Replace
fuel/water separator.
3. Verify the engine load rating is not
being exceeded.
4. Check and time injection pump (refer
to Group 14, Fuel System).
5. Check and replace inoperative
injectors.
1. Replace engine mounts.
2. Check and replace the vibrating
components.
3. Inspect/replace the vibration damper.
4. Inspect/replace the fan drive.
5. Check/replace the generator.
6. Check/correct flywheel alignment.
7. Inspect the crankshaft and rods for
damage that causes an unbalance.
Repair/replace as required.
8. Check/repair driveline components.
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