Toyota 4A-FE Repair Manual page 192

LUBRICATION SYSTEM - Troubleshooting
LU-5
TROUBLESHOOTING
Problem Possible cause Remedy
Page
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I
Oil leakage
I
Cylinder head, cylinder block or oil pump Repair as necessary
body damaged or cracked
Oil seal faulty Replace oil seal EM-135
LU-13
Gasket faulty Replace gasket
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Low oil pressure Oil leakage Repair as necessary
Relief valve faulty Repair relief valve LU-12,13
Oil pump faulty Repair oil pump LU-9
Poor quality engine oil
Replace engine oil
LU-6
Crankshaft bearing faulty Replace bearing
EM-122
Connecting rod bearing faulty Replace bearing EM-11 9
Oil filter clogged Replace oil filter
LU-7
High oil pressure Relief valve faulty Repair relief valve
LU-12,13