C9.3 Marine Auxiliary and Generator Set Engine Caterpillar

Exhaust System Contains Oil

Usage:

C9.3 C93

Probable Causes

Failed turbocharger seals
Worn valve guide seals or faulty valve guide seals
Worn valve guides
Worn piston rings and/or liners
Extended idle times

Recommended Actions

Note: After the repair has been made, the oil should be cleaned from the exhaust system. To clean the oil from the exhaust system, perform the following procedure:

Remove excess oil from piping with a clean cloth.
Inhibit regeneration with the inhibit switch.
Operate the engine at elevated idle (1500 RPM) for 10 minutes.

If blue smoke dissipates, return machine to work.

If white smoke does not dissipate, Contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).

Complete the procedure in the order in which the steps are listed.

Show/hide table

Table 1
Troubleshooting Test Steps	Values	Results
1. Failed Turbocharger Seals A. Check the inlet manifold and the exhaust manifold for oil.	Turbo Seals	Result: Oil is not present in the inlet or exhaust manifold. Proceed to Test Step 2. Result: Oil is present in the inlet or exhaust manifold. Repair: Replace the turbocharger. Verify the repair. If the problem is not resolved, proceed to Test Step 2.
2. Worn Valve Guide Seals or Faulty Valve Guide Seals A. Inspect the valve guide seals for wear and for damage.	Valve Guide Seals	Result: The valve guide seals are not damaged. Proceed to Test Step 3. Result: The valve guide seals are damaged. Repair: Replace the valve guide seals. Verify the repair. If the problem is not resolved, proceed to Test Step 3.
3. Worn Valve Guides and Valves A. Inspect the valve guides and valves for wear. Refer to the Specification manual for the maximum permissible wear of the valve guides and valves.	Valve Guides	Result: The valve guides and valves are not worn. Proceed to Test Step 4. Result: The valve guides and valves are worn. Repair: If necessary, recondition the cylinder head. Verify the repair. If the problem is not resolved, proceed to Test Step 4.
4. Worn Piston Rings and Cylinder Liners A. Piston rings or cylinder liners that have excessive wear can cause too much pressure in the crankcase. The additional pressure in the crankcase will cause more than the normal amount of crankcase blowby from the crankcase breather. Use the following service tools, along with Software License, NETG5044: 1. 285-0900 Blowby Tool Gp (SMALL ENGINE) 2. 348-5430 Multi-Tool Gp B. Inspect piston rings	Piston Rings	Result The piston rings are not worn. Proceed to Test Step 5. Result The piston rings and or liners are worn. Repair: Replace the piston rings. Verify the repair. If the problem is not resolved, proceed to Test Step 5.
5. Extended Idle Times A. Extended idle times will allow oil to pass into the exhaust system.	Idle Times	Result The idle times are extensive. Repair: Reduce the idle times. Verify that the repair eliminated the problem.

If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).