Table 90
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.
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, “Pis-
tons 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).
(continued)
182 UENR4469-36
Symptom Troubleshooting
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