Toyota Land Cruiser 1988 Repair Manual page 241

LU-8 LUBRICATION SYSTEM- Oil Pump
INSPECTION OF OIL PUMP
1. INSPECT RELIEF VALVE
Coat the valve with engine oil and check that it falls
smoothly into the valve hole by its own weight.
If it is not replace the relief valve. If necessary, replace
the oil pump assembly.
2. INSPECT DRIVE AND DRIVEN GEARS
A. Inspect gear body clearance
Using a thickness gauge, measure the clearance between
the gear and pump body.
Standard body clearance: 0.095-0.175 mm
(0.0037- 0.0069
in.)
Maximum body clearance:
0.20
mm
(0.0079
in.)
If the clearance is greater than maximum, replace the
Luo1ss
gears or oil pump assembly.
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B.
Inspect gear side clearance
Using a thickness gauge and precision straight edge,
measure the clearance between the gear and precision
straight edge.
Standard side clearance: 0.030- 0.090 mm
(0.0012- 0.0035
in.)
Maximum side clearance:
0.15
mm
(0.0059
in.)
If the clearance is greater than maximum, replace the
gears. If necessary, the oil pump assembly.
C. Inspect gear backlash
Using a dial indicator, measure the backlash while turn-
ing the driven gear clockwise and counterclockwise in
several places.
Standard backlash:
0.500 - 0.600
mm
(0.0197- 0.0236
in.)
Maximum backlash: 0.95 mm (0.0374 in.)
If the backlash is greater than maximum, replace the
gears. If necessary, replace the shaft.