SEAL-OIL 5N2903 - Caterpillar

Probable Causes
Extended idle times
Failed turbocharger seals
Worn valve guide seals or faulty valve guide seals
Worn valve guides
Worn piston ringsComplete the procedure in the order in which the steps are listed.
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.
Repair: Reduce the idle times.
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.
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.
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.
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.
Result The piston rings are not worn.
Contact the Dealer Solutions Network (DSN).