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TROUBLESHOOTING
Possible causes
Oil cooler
Oil pump
Oil filter
Front cover timing gear
case
Flywheel housing
Weakened regulator valve spring
Defective piston cooling oil jet(s)
Oil working its way up into combustion chamber(s) through piston rings
Oil working its way down into combustion chamber(s) through valves
Too high oil viscosity
Poor oil quality
Deterioration of oil
Excess of oil
Fuel mixed with oil
Incorrectly mounted element
Defective gasket
Defective O-ring
Clogged element
Damaged element
Weakened bypass valve spring
Malfunctioning oil pump
Interference between oil pump gear and oil pump case
and/or cover
Incorrectly connected oil pipe
Clogged oil strainer
Weakened relief valve spring
Incorrect installation
Clogged element
Defective O-ring
Defective front oil seal
Incorrectly mounted front cover
Defective rear oil seal
Incorrectly mounted gasket
Symptoms
O
O
O
O
O
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O
O
O
O
O
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O
O
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O
O
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O
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O
O
O
12
Reference Gr
Gr11
Gr11
12-9
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Table of Contents
Troubleshooting
