Table 12
Troubleshooting Test Steps Values Results
1. Breather Filter
A. Check that the breather element is correctly installed and that
the element is not damaged.
B. Check for restrictions or blockages in orifice (2).
Breather filter Result: The breather element is incorrectly installed or
damaged.
Install a new filter element. Refer to Operation and Mainte-
nance Manual, “Engine Crankcase Breather Element -
Replace”.
Note: If a new filter element blocks before the service peri-
od is completed, the blockage can indicate a fault in the
engine.
Result: There is a restriction or blockage in orifice (2).
If necessary, replace the crankcase breather. Refer to Dis-
assembly and Assembly, “Crankcase Breather - Remove”
and refer to Disassembly and Assembly, “Crankcase
Breather - Install”
Result: The breather filter is OK.
Proceed to Test Step 2.
2. Breather Hoses
A. Check the oil return hose and the breather outlet hose for restric-
tions or blockages.
Breather hoses
Result: There is a restriction or blockage in one of the
breather hoses.
Replace the breather hoses, as necessary.
Result: The breather hoses are OK.
Proceed to Test Step 3.
3. Breather Heater
A. Turn the keyswitch to the OFF position.
B. Disconnect the breather heater connector.
C. Turn the keyswitch to the ON position.
D. Use a suitable multimeter to measure the voltage at the harness
connector for the heater.
E. Turn the keyswitch to the OFF position.
F. Use a suitable multimeter to measure the resistance of the heater
element.
10 V to 14 V for
step D
Less than 10 k
Ohms for step
F.
Result: The measured voltage is less than 10 V.
There is a fault in the wiring to the breather heater.
Repair the harness or repair the harness
Result: The measured resistance is greater than 10 k
Ohms.
Replace the breather heater.
Result: All measurements are within the expected ranges.
Proceed to Test Step 4.
4. Excessive Blow-by
Excessive blow-by increases the flow of fumes through the breath-
er system and can cause the breather element to block. The pres-
sure relief valve may then open.
A. If excessive blow-by is suspected, replace the breather element.
Refer to the Operation and Maintenance Manual, “Engine Crank-
case Breather Element - Replace”.
B. Investigate the cause of the excessive blow-by. Refer to Trouble-
shooting, “Oil Consumption Is Excessive”.
Blow-by Result: The fault has been rectified.
Return the engine to service.
Result: The fault is still present.
Contact the Dealer Solution Network (DSN).
44
UENR0612
Symptom Troubleshooting
This document has been printed from SPI2. NOT FOR RESALE
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