No Oil Pressure; Low Oil Pressure; High Oil Pressure - Jeep J-10 Series 1982 Technical & Service Manual

GENERAL SERVICE AND DIAGNOSIS 1A-5
Service Diagnosis—Mechanical (Continued)
Condition Possible Cause
Correction
EXCESSIVE OIL
CONSUMPTION
(10) Piston ring gaps not properly
staggered.
(10) Repair as necessary.
(Continued)
(11) Excessive main or connecting rod
bearing clearance.
(11) Check bearing clearance, repair
as necessary.
(12 PCV valve stuck closed
(12)
Replace PCV valve.
NO OIL PRESSURE
(1)
Low oil level. (1)
Add oil to correct level.
(2)
Oil pressure gauge or sending unit
inaccurate.
(2)
Refer to Oil Pressure Gauge
in Chapter 1L.
(3)
Oil pump malfunction.
(3)
Refer to Oil Pump in Chapter IB
(4)
(5)
Oil pressure relief valve sticking.
Oil passages on pressure side of
pump obstructed.
(4)
(5)
Remove and inspect oil pressure
relief valve assembly. Refer to
Chapter IB.
Inspect oil passages for
obstructions.
(6)
Oil pickup screen or tube
obstructed.
(6)
Inspect oil pickup for
obstructions.
(7)
Loose oil inlet tube.
(7)
Replace inlet tube.
LOW OIL PRESSURE
(1) Low oil level.
(1) Add oil to correct level.
(2)
Oil excessively thin due to dilu
tion, poor quality, or improper
grade.
(2) Drain and refill crankcase with
correct grade oil.
(3)
Oil pressure relief spring weak or
sticking.
(3)
Remove and inspect oil pressure
relief valve assembly.
(4)
(5)
Oil pickup tube and screen assem
bly has restriction or air leak.
Excessive oil pump clearance.
(4)
(5)
Remove and inspect oil inlet tube
and screen assembly. (Fifl pickup
with lacquer thinner to find leaks.)
Replace if defective.
Check clearances: refer to Oil
Pump in Chapter 3B
HIGH OIL PRESSURE
(6)
(1)
Excessive main, rod, or camshaft
bearing clearance.
Improper grade oil.
(6)
(1)
Measure bearing clearance:--, rep.w
as necessary.
Drain and refill crankcase with
correct grade oil.
(2)
Oil pressure gauge or sending unit
inacurrate.
(2)
Refer to Oil Pressure Gauge
in Chapter 1L.
(3)
Oil pressure relief valve sticking
closed.
(3)
Remove and inspect oil pressure
relief valve assembly.
(4)
Oil pressure relief valve anti-lock
port blocked (eight-cylinder only).
(4) Check for obstruction; repair
as necessary.
MAIN BEARING
NOISE
(1)
Insufficient oil supply.
(1)
Check for low oil level r,y low oil
pressure.
(2)
Main bearing clearance excessive.
(2)
Check main bearing clearance,
repair as necessary.
(3)
Crankshaft end play excessive.
(3)
Check end play, repair as ne.ee.-s:fry