Probable cause
Possible remedy
Low
oil pressure
Defective oil pump
Repm.
-cont.
Clogged fuel lines Flush.
Defective
oil pressure
valve
Repajr
and replace
if
necessary
Clogged oil filter
Change
element and oil.
Leak
in
lubricating system
Repair.
Pumping
up
of
oil Excessive oil in oil pan
Drain oil to lower oil level.
Worn
cylinders, pistons or
Repm
and replace parts
if
neces-
piston rings
sary
Sticking piston rings Repair and replace damaged
rings
if
necessary.
Worn
valve
guides
Replace
valve
guides.
Prolonged operation under no Overhaul engine
if
oil -laden gases
load
are exhausted.
Insufficient
m Clogged air cleaner Clean and replace element
if
(paper element type)
necessary.
Clogged
air cleaner
Wash
interior.
(Oil
bath
type)
Clogged intake manifold
Check and clean.
Poor compression
Defective
valve
seats
Repajr
Sticking
valve
stems
Repm
and replace
valve
stems
if
necessary
Failure
of
rocker arms
to
Adjust
valve
clearance to 0.3 mm
lift
valves
(0.OI2mm).
Worn
cylinder, pistons or
Repair and replace parts
if
neces-
piston rings
sary.
Sticking piston rings
Replace damaged rings.
Exhaust
gas
leak in cylinder
Retighten and replace gasket
if
head gasket necessary.
Worn or broken
valve
springs Replace parts.
Jnsufficient torque
of
starting
motor
(at
starting)
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66-
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