Observable Diagnostics and Tests
04
150
6
RG,RG34710,1542 –19–27NOV00–1/1
10.5L/12.5L Engines - L3 - Engine Oil Pressure Low
Symptom Problem
Solution
10.5L/12.5L - L3 - Engine Oil Low crankcase oil level Fill crankcase to proper oil level.
Pressure Low
Clogged oil cooler or filter Remove and inspect oil cooler. See
REMOVE, CLEAN, AND INSPECT
ENGINE OIL COOLER in Section
02, Group 060. Replace oil filter.
Excessive oil temperature Remove and inspect oil cooler. See
REMOVE, CLEAN, AND INSPECT
ENGINE OIL COOLER in Section
02, Group 060.
Defective oil pump Remove and inspect oil pump. See
CLEAN AND INSPECT OIL PUMP
AND DRIVE GEAR in Section 02,
Group 060.
Incorrect oil Drain crankcase and refill with
correct oil.
Oil pressure regulating valve failure Remove and inspect oil pressure
regulating valve. See Group
REMOVE, INSPECT, AND INSTALL
OIL PRESSURE REGULATING
VALVE in Section 02, Group 060.
Broken piston spray jet Replace piston spray jet. See
REMOVE AND INSTALL PISTON
SPRAY JETS in Section 02, Group
030.
Clogged oil pump screen or cracked Remove oil pan and clean screen.
pick-up tube Replace pick-up tube. See REMOVE
AND INSTALL OIL PICKUP TUBE in
Section 02, Group 060.
Excessive main or connecting rod Determine bearing clearance. See
bearing clearance CHECK MAIN
BEARING-TO-JOURNAL OIL
CLEARANCE in Section 02, Group
040.
CTM100 (06APR04)
04-150-6
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=354
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