Workshop Manual

6A–16
ENGINE MECHANICAL (6VE1 3.5L)
Engine Oil Consumption Excessive
Condition Possible cause Correction
Oil leaking
Oil pan drain plug loose Retighten or replace gasket
Crankcase fixing bolts loosened Retighten
Oil pan setting bolts loosened Retighten
Oil pan gasket broken Replace gasket
Front cover retaining bolts loose or
gasket broken
Retighten or replace gasket
Head cover fixing bolts loose or
gasket broken
Retighten or replace gasket
Oil filter adapter cracked Replace
Oil filter attachings bolt loose or
rubber gasket broken
Retighten or replace oil filter
Crankshaft front or rear oil seal
defective
Replace oil seal
Oil pressure unit loose or broken Retighten or replace
Blow–by gas hose broken Replace hose
Positive Crankcase Ventilation Valve
clogged
Clean
Engine/Transmission coupling failed Replace oil seal
Oil leaking into combustion
chambers due to
p
oor seal in valve
Valve stem oil seal defective Replace
chambers
due
to
oor
seal
in
valve
system
Valve stem or valve guide worn Replace valve and valve guide
Oil leaking into combustion
chambers due to poor seal in cylinder
t
Cylinders and pistons worn
excessively
Replace cylinder body assembly and
pistons
par
t
s
Piston ring gaps incorrectly
positioned
Correct
Piston rings set with wrong side up Correct
Piston ring sticking Replace cylinder body assembly and
pistons
Piston ring and ring groove worn Replace pistons and others
Return ports in oil rings clogged Clean piston and replace rings
Positive Crankcase Ventilation
System malfunctioning
Positive Crankcase Ventilation Valve
clogged
Clean
Others
Improper oil viscosity Use oil of recommended S.A.E.
viscosity
Continuous high speed driving
and/or severe usage such as trailer
towing
Continuous high speed operation
and/or severe usage will normally
cause increased oil consumption