TM 5-2420-230-24-2
roubleshooting Symptoms Charts
B3.9 and B5.9 Series Engines
Page TS-70
Section TS - Troubleshooting Symptoms
Lubricating Oil Pressure Low
This is symptom tree T105.
Cause
Correction
Check and replenish lubricating oil. Refer to
Lubricating oil level is low
.......
Procedure 007-043.
OK
C
ylinder head core and expansion plugs
Check cylinder head. Refer to Procedure
.......
002-004.
leaking or misassembled
OK
L
Refer to the Lubricating Oil Contamination
ubricating oil filter is diluted
.......
symptom tree.
OK
L
Change the oil and filter. Refer to Procedures
007-025 and 007-013. Review the oil change
ubricating oil filter is plugged
.......
interval. Refer to the operation and mainte-
nance manual.
OK
L
ubricating oil pressure switch, gauge, or
Check the oil pressure switch, gauge, or
sensor for correct operation and location. Refer
sensor is malfunctioning or is not in the
.......
to Procedure 007-052.
correct location
OK
L
Make sure the correct oil filter is being used.
Refer to the Operation and Maintenance
ubricating oil filter is not correct
.......
Manual, B Series Engines, Bulletin No.
3810205.
OK
P
Check and replace valve. Refer to Procedure
ressure regulator valve struck open
.......
007-029.
OK
L
Check the oil cooler. Refer to Procedure
ubricating oil cooler is plugged
.......
007-003.
OK
L
ubricating oil cooler was replaced with
.......
Check and remove shipping plugs.
shipping plugs left in cooler
OK
T
(Continued)
L-654
