Toyota Supra 1990 Manual page 326

LU-10
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LUBRICATION SYSTEM - Oil Pump
LU0560
LU0354
LU0355
LU0356
INSPECTION OF OIL PUMP
1. INSPECT RELIEF VALVE
2.
3.
4.
Coat the valve with engine oil and check that it falls smooth-
ly into the valve hole by its own weight.
If it does not, replace the relief valve. If necessary, replace
the oil pump assembly.
INSPECT BODY CLEARANCE
Using a thickness gauge, measure the clearance between
the driven gear and body.
Standard clearance: 0.105 - 0.175 mm
(0.0041 - 0.0069 in.)
Maximum clearance: 0.2 mm (0.008 in.)
If the clearance is greater than maximum, replace the drive
gear and/or body.
INSPECT GEAR BACKLASH
Using a thickness gauge, measure the backlash as shown.
Standard backlash: 0.5 - 0.6 mm
(0.020 - 0.024 in.)
Maximum backlash: 0.9 mm (0.035 in.)
If the backlash is greater than maximum, replace the drive
shaft and/or driven gear.
INSPECT SIDE CLEARANCE
Using a thickness gauge and flat block, measure the side
clearance as shown.
Standard clearance: 0.03 - 0.09 mm
(0.0012 - 0.0035 in.)
Maximum clearance: 0.15 mm (0.0059 in.)
If the clearance is greater than maximum, replace the drive
shaft and driven gear and/or body.