Troubleshooting; Oil Pressure Check - Toyota Supra 1990 Manual

LU-4
LUBRICATION SYSTEM - Troubleshooting, Oil Pressure Check
TROUBLESHOOTING
Problem Possible cause Remedy Page
Oil leakage Cylinder head, cylinder block or oil pump Repair as necessary
body damaged or cracked
Oil seal faulty Replace oil seal EM-81
Gasket faulty Replace gasket
Low oil pressure Oil leakage Repair as necessary
Relief valve faulty Repair relief valve
LU-7
Oil pump faulty Repair oil pump LU-7
Engine oil poor quality Replace engine oil LU-5
Crankshaft bearing faulty
Replace bearing
EM-63
Connecting rod bearing faulty Replace bearing EM-63
Oil filter clogged Replace oil filter LU-5
High oil pressure Relief valve faulty Repair relief valve LU-7
OIL PRESSURE CHECK
Recommended Viscosity (SAE):
OF -20 0 20
°c
-29 -18 -7
40 60 80 100
4 16 27 38
TEMPERATURE RANGE ANTICIPATED BEFORE
NEXT OIL CHANGE
LU0884
EM1759
LU0350
1 _ CHECK OIL QUALITY
Check the oil for deterioration, entry of water, discoloring
or thinning.
If oil quality is poor, replace.
Use API grade SG, multigrade, fuel-efficient and recom-
mended viscosity oil.
2. CHECK OIL LEVEL
3.
4.
5.
The oil level should be between the "L" and "F" marks
on the dipstick.
If low, check for leakage and add oil up to the "F" mark.
REMOVE OIL PRESSURE SENDER GAUGE
INSTALL OIL PRESSURE GAUGE
START ENGINE
Start engine and warm it up to normal operating tem-
perature.
6. MEASURE OIL PRESSURE
Oil pressure:
At idle speed
0.3
kg/cm2
(4.3
psi.
29
kPa)
or more
At
3,000
rpm
2.5 - 5.0
kg/cm2
(36 -
71 psi.
245 - 490
kPa)
HINT: Check for oil leakage after reinstalling the oil pres-
sure sender gauge.