Jeep 1987 Wrangler Workshop Manual page 242

ENGINES
GENERAL SERVICE AND DIAGNOSIS
Service Diagnosis - Mechanical (Continued)
Condition
Possible Cause
Correction
N O O I L P R E S S U R E
(Continued)
(2) Oil pressure gauge, warning lamp or
sending unit inaccurate.
(2) Refer to Oil Pressure Gauge or
{Warning Lamp.
(3) Oil pump malfunction
1
(3) Refer to O i l Pump.
(4) O i l pressure relief valve sticking. (4) Remove and inspect oil pressure relief
valve assembly.
(5) Oil passages on pressure side of pump
obstructed.
(5) Inspect oil passages for obstructions
(6) Oil pickup screen or tube obstructed. (6) Inspect oil pickup for obstructions.
(7) Loose oil inlet tube.
(7) Tighten or seal inlet tube.
L O W O I L P R E S S U R E
(1) Low oil level. (1) Add oil to correct level.
(2) Inaccurate gauge, warning lamp or
sending unit.
(2) Refer to Oil Pressure Gauge or
Warning Lamp.
(3) O i l excessively thin because of
dilution, poor quality, or improper
grade.
(3) Drain and refill crankcase with
recommended oil.
(4) Excessive oil temperature. (4) Correct cause of overheating engine.
(5) Oil pressure relief spring weak or
sticking
(5) Remove and inspect oil pressure relief
valve assembly.
(6) Oil inlet tube and screen assembly has
restriction or air leak.
(6) Remove and inspect oil inlet tube and
screen assembly. (Fill inlet tube with
lacquer thinner to locate leaks.)
(7) Excessive oil pump clearance. (7) Measure clearances; refer to O i l
Pump
(8) Excessive main. rod. or camshaft
bearing clearance.
(8) Measure bearing clearance^, repair as
necessary.
H I G H O I L P R E S S U R E
(1) Improper oil viscosity
(I) Drain and refill crankcase with correct
viscosity oil.
(2) O i l pressure gauge or sending unit
inaccurate
(2) Refer to Oil Pressure Gauge.
S E E
I.S,
N
O
T
E
S
80651C
B-8