C7.1 Engines Caterpillar

Exhaust System Contains Oil

Usage:

C7.1 6J6

Probable Causes

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

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

Show/hide table

Table 1
Troubleshooting Test Steps	Values	Results
1. Extended Idle Times A. Extended idle times will allow oil to pass into the exhaust system.	Idle times	Result The idle times are extensive. Reduce the idle times. Proceed to Test Step 6. Result The idle times are not extensive. Proceed to Test Step 2.
2. Failed Turbocharger Seals A. Check the inlet manifold and the exhaust manifold for oil.	Turbo seals	Result: Oil is present in the inlet or exhaust manifold. Repair: Replace the turbocharger. Verify the repair. Proceed to Test Step 6. Result: Oil is not present in the inlet or exhaust manifold. Proceed to Test Step 3.
3. 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 damaged. Repair: Replace the valve guide seals. Verify the repair. Proceed to Test Step 6. Result: The valve guide seals are not damaged. Proceed to Test Step 4.
4. Worn Valve Guides A. Inspect the valve guides for wear. Refer to the Specification manual for the maximum permissible wear of the valve guides.	Valve guides	Result: The valve guides are worn. Repair: If necessary, recondition the cylinder head. Verify the repair. Proceed to Test Step 6. Result: The valve guides are not worn. Proceed to Test Step 5.
5. Worn Piston Rings A. Remove the pistons. Refer to Disassembly and Assembly, "Pistons and Connecting Rods - Remove". B. Remove the piston rings from the pistons. Refer to Disassembly and Assembly, "Pistons and Connecting Rods - Disassemble" C. Inspect the pistons and piston rings for wear or damage. Refer to the "Specifications" manual for further information.	Piston rings	Result The piston rings are worn. Repair: Replace the piston rings. Verify the repair. Proceed to Test Step 6. Result The piston rings are not worn. Contact the Dealer Solutions Network (DSN).
6. Check the Aftertreatment System for Oil A. Remove excess oil from piping with a clean cloth. B. Remove the Clean Emissions Module (CEM). Refer to Disassembly and Assembly, "Clean Emissions Module - Remove and Install". C. Support the CEM over a suitable container with the exhaust inlet downwards. Leave the CEM to drain for 8 hours. D. Check the quantity of drained oil in the container.	CEM	Result The volume of drained oil is greater than 1.0 L (1.05669 qt). Repair: Install a replacement CEM. Refer to Disassembly and Assembly, "Clean Emissions Module - Remove and Install". Return the unit to service. Result The volume of drained oil is less than 1.0 L (1.0 qt). Proceed to Test Step 7.
7. Recover the Aftertreatment System A. Clean any remaining oil from the piping and the CEM inlet with a clean cloth. B. Install the Clean Emissions Module (CEM). Refer to Disassembly and Assembly, "Clean Emissions Module - Remove and Install". C. Run the engine at high idle with no load for a minimum of 20 minutes. D. Use the electronic service tool to perform the "Aftertreatment Recovery Procedure". While the procedure is progressing, check for smoke from the exhaust. Some smoke will be evident during the procedure. The smoke must dissipate before the procedure is completed.	CEM	Result: The "Aftertreatment Recovery Procedure" completes with a soot load of less than 80% and no smoke from the exhaust. Return the unit to service. Result The "Aftertreatment Recovery Procedure" completes with a soot load of more than 80% or smoke from the exhaust. Contact the Dealer Solutions Network (DSN).

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