GEAR-TRANSFER 1P3185 - Caterpillar

Probable Causes
Oil leaks
Oil level
Air inlet and exhaust system
Turbocharger
Cylinder performanceRecommended Actions
Oil Leaks
Locate all oil leaks. Repair the oil leaks. Check for dirty crankcase breathers.Oil Level
Check the oil level in the engine.
If the oil level is high, check for contamination of the oil with coolant. Refer to the symptom Troubleshooting, "Oil Contains Coolant".
If no contamination is identified, remove any excess oil.Air Inlet and Exhaust System
Check the air filter restriction indicator, if equipped. Clean plugged air filters or replace plugged air filters. Refer to the Operation and Maintenance Manual.
Check the air inlet and exhaust system for restrictions and/or leaks. Refer to Systems Operation/Testing and Adjusting.Turbocharger
Note: The turbocharger that is installed on this engine is a nonserviceable item. If any mechanical fault exists, except for the wastegate actuator (if equipped), then the turbocharger must be replaced. The wastegate actuator (if equipped) can be replaced.
Check the following items:
Check for correct installation of the turbocharger.
Check that the turbine blades rotate freely.
Check that the oil drain is not blocked or restricted.
Check that the housing for the turbocharger is free of dirt and debris.
Ensure that the wastegate (if equipped) on the turbocharger is adjusted correctly. Refer to Systems Operation/Testing and Adjusting.
If necessary, replace the turbocharger. Refer to Disassembly and Assembly.Cylinder Performance
Check the valve lash and reset the valve lash, if necessary. Refer to Systems Operation/Testing and Adjusting.
Check for correct installation of the unit injector connectors. Check for correct installation of all other applicable connectors. Refer to service Troubleshooting, "Electrical Connectors - Inspect".
Perform the "Cylinder Cutout Test" on Cat ET in order to identify any injectors that might be misfiring.
If Cat ET indicates a problem, remove the electronic unit injector from the suspect cylinder. Refer to Disassembly and Assembly.
Perform a compression test. Refer to Systems Operation/Testing and Adjusting. Possible causes of low compression are shown in the following list:
Faulty piston
Faulty piston rings
Worn cylinder bores
Worn valves
Faulty cylinder head gasket
Damaged cylinder head
Perform all necessary repairs. Ensure that the repairs have eliminated the problem.