Excessive Engine Oil Consumption - Perkins NJ Series Troubleshooting Manual

SENR9982-01
Excessive Engine Oil
Consumption
Probable Causes
•
Misreading oil level
• Oil leaks
• Engine crankcase breather
•
Oil level
• Air intake and exhaust system
• Turbocharger
• Low compression (cylinder pressure)
Recommended Actions
Misreading Oil Level
1. Accurately measure the consumption of oil and
fuel over a period of 50 engine hours.
2. If the oil consumption is greater than 0.2% of the
fuel consumption, use the following procedure
in order to investigate the cause of the high oil
consumption.
Oil Leaks
1. Check for evidence of oil leaks on the engine.
2. Rectify any oil leaks from the engine.
3. Check for evidence of oil in the coolant.
4. If no oil leaks are identified, refer to "Engine
Crankcase Breather".
Engine Crankcase Breather
1. Check the engine crankcase breather for blockage
or restrictions.
2. Check for excessive oil from the outlet of the
breather.
3. Repair all defects. Verify that the repair has
eliminated the fault.
4. If no faults are found, refer to "Oil Level".
Oil Level
i02528860
1. Check the oil level in the engine.
2. If the oil level is high, check for contamination
of the oil with coolant. Refer to Troubleshooting,
"Coolant in Engine Oil".
3. If no contamination is identified, remove any
excess oil.
4. If the oil level is satisfactory, refer to "Air Intake
and Exhaust System".
Air Intake and Exhaust System
1. Check the air filter restriction indicator, if equipped.
2. Ensure that the air filter is clean and serviceable.
3. Check the air intake and the exhaust system for
the following defects:
•
Blockages
•
Restrictions
• Damage to the air intake and exhaust lines and
hoses
4. Make all necessary repairs to the engine.
5. Ensure that the repairs have eliminated the
diagnostic code.
6. If no faults are found, refer to "Turbocharger".
Turbocharger
Note: The turbocharger that is installed on this
engine is a nonserviceable item. If any mechanical
fault exists, except for the wastegate actuator, then
the turbocharger must be replaced.
1. Check that the oil drain for the turbocharger is not
blocked or restricted.
2. Check the turbocharger for evidence of internal
oil leaks.
3. If necessary, replace the turbocharger. Refer
to Disassembly and Assembly, "Turbocharger
- Remove" and Disassembly and Assembly,
"Turbocharger - Install".
4. Check that the repairs have eliminated the faults.
5. If the repairs have not eliminated the fault proceed
to "Low Compression (cylinder pressure)".
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Troubleshooting Section