Troubleshooting

• Low compression (cylinder pressure)
Recommended Actions
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
Table 53
Troubleshooting Test Steps
Values Results
1. Misreading Oil Level
A. Accurately measure the consumption of oil and fuel over a
period of 50 engine hours.
Oil level Result: The oil consumption is less than 0.1% of the fuel
consumption.
Oil consumption is within specification. Return the unit to
service
Result: The oil consumption is greater than 0.1% of the fuel
consumption.
Proceed to Test Step 2.
2. Oil Leaks
A. Check for evidence of oil leaks on the engine.
B. Check for evidence of oil in the coolant.
Oil leaks Result: An oil leak is identified.
Repair: Rectify the cause of the oil leak.
Result: Oil is present in the coolant.
Repair:Refer to Troubleshooting, “Coolant Contains Oil”.
Result: No oil leaks are identified
Proceed to Test Step 3.
3. Engine Crankcase Breather
A. Check the engine crankcase breather for blockage or
restrictions.
B. Check for excessive oil from the outlet of the breather.
C. Check the centrifugal breather for a mechanical failure.
D. Check for oil around the crankcase breather pressure relief
valve.
Breather Result: The engine crankcase breather is blocked or
restricted.
Repair: Clear the blockage or restriction.
Result: Excessive oil is ejected from the outlet of the
breather.
Repair: Investigate the cause of the excessive oil content in
the breather flow. If necessary, replace the element in the
breather. Refer to Operation and Maintenance Manual, “En-
gine Crankcase Breather Element - Replace”.
Result: There is oil around the crankcase breather pressure
relief valve.
Repair: Refer to Troubleshooting, “Crankcase Breather Ejects
Oil”.
Result: No oil is ejected through the breather.
Proceed to Test Step 4.
(continued)
110 UENR0612-07
Symptom Troubleshooting
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