Table 31
Troubleshooting Test Steps
Values Results
3. One-way Valve
A. Disconnect breather drain hose (4) from one-way valve (5)
and then remove the one-way valve from the engine. Refer to
Disassembly and Assembly, “Crankcase Breather - Remove”.
B. Use a suitable cleaning solution to flush the one-way
valve.
C. Connect a low-pressure air supply breather drain hose side
of the one-way valve. The air must flow freely through the
valve.
D. Connect a low-pressure air supply crankcase side of the
one-way valve. The valve must block the airflow.
One-way valve Result: The one-way valve does not operate correctly.
Repair: Install a replacement valve. Refer to Disassembly
and Assembly, “Crankcase Breather - Install”.
Result: The one-way valve operates correctly.
Proceed to Test Step 4.
4. Excessive Blow-by
Note: Excessive blow-by increases the flow of fumes through
the breather system and can cause oil discharge from the
fumes disposal tube.
A. Check the engine for excessive blow-by.
Blow-by Result: There is excessive blow-by.
Repair: Replace the breather filter.
Investigate the cause of the excessive blow-by. Refer to
Troubleshooting, “Oil Consumption Is Excessive”.
Result: The blow-by is not excessive.
Contact the Dealer Solutions Network (DSN).
i06154889
Cylinder Is Noisy
Probable Causes
• Diagnostic codes
• Fuel quality
• Valve train components
• Low compression (cylinder pressure)
• Injectors
• Pistons and connecting rods
Recommended Actions
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
UENR4469-36 95
Symptom Troubleshooting
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