TM 5-2420-230-24-2
Troubleshooting Symptoms Charts
B3.9 and B5.9 Series Engines
Page TS-72
Section TS - Troubleshooting Symptoms
Lubricating Oil Sludge in the Crankcase Excessive
This is symptom tree T106.
Cause
Correction
Check the bulk oil supply. Drain the oil and
replace with noncontaminated oil. Replace the
Bulk oil supply is contaminated
.......
oil filters. Refer to Procedure 007-025 and
007-013.
OK
C
Refer to the Coolant Temperature Below
oolant temperature is below specification
.......
Normal symptom tree.
OK
C
Check and clean the crankcase breather and
rankcase ventilation system is plugged
.......
vent tube. Refer to Procedure 003-018.
OK
F
Operate the engine from a tank of high-quality
fuel. Refer to the Operation and Maintenance
uel grade is not correct for the application, or
.......
Manual, B Series Engines, Bulletin No.
the fuel quality is poor
3810205.
OK
L
Change the oil and filters. Refer to Procedure
007-013 or the Operation and Maintenance
ubricating oil does not meet specifications for
.......
Manual, B Series Engines, Bulletin No.
operating conditions
3810205 for oil specifications.
OK
L
Verify the correct lubricating oil drain interval.
Refer to Section V in the Operation and
ubricating oil drain interval is excessive
.......
Maintenance Manual, B Series Engines,
Bulletin No. 3810205.
OK
L
ubricating oil is contaminated with coolant or
Refer to the Lubricating Oil Contaminated
.......
fuel
symptom tree.
OK
C
Check for excessive blowby. Refer to the
rankcase pressure is excessive
.......
Crankcase Gases (Blowby) Excessive symptom
tree.
L-656
