TM 5-2420-230-24-2
Troubleshooting Symptoms Charts
B3.9 and B5.9 Series Engines
Page TS-38
Section TS - Troubleshooting Symptoms
Engine Noise Excessive -- Connecting Rod
This is symptom tree T049.
Cause
Correction
Check the oil level. Verify the dipstick calibra-
tion and the oil pan capacity. Fill the system to
Lubricating oil level is below specification
.......
the specified level. Refer to Procedure 007-043
or the Operation and Maintenance Manual, B
Series Engines, Bulletin No. 3810205.
OK
L
Check the oil pressure. Refer to Procedure
ubricating oil pressure is below specification
.......
007-052. If the pressure is low, refer to the
Lubricating Oil Pressure Low symptom tree.
OK
L
Refer to the Lubricating Oil System - General
ubricating oil is thin or diluted
.......
Information in Section 7. Refer to the Lubricat-
ing Oil Contaminated symptom tree.
OK
C
rankshaft journals are damaged or out of
Inspect the crankshaft journals. Refer to
.......
Procedure 001-016.
round
OK
C
Remove and inspect the connecting rods.
onnecting rod is bent or out of alignment
.......
Refer to Procedure 001-014.
OK
C
onnecting rod capscrews are loose or not
Check the torque on the connecting rod
.......
tightened correctly
capscrews. Refer to Procedure 001-014.
OK
C
onnecting rod and bearings are damaged or
Inspect the connecting rod and bearings. Refer
worn, are not assembled correctly, or are the
.......
to Procedure 001-005 and 001-014.
wrong bearings
L-622