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Condition
Seized
valve
seat
Excessively
worn
cylinder
and
piston
Faulty connecting
rod
Faulty
crankshaft
bearing
Engine
Mechanical
Probable
cause
Improper
valve
clearance
Weakened valve
spring
Thin valve head
edge
Narrow valve
seat
Overheating
Over
speeding
Stuck
valve
guide
Shortage
of
engine
oil
Dirty engine
oil
Poor
quality
ofoiL
Overheating
Wrong
assembly
of
piston
with
connecting
rod
Improper
piston ring
clearance
Broken
piston ring
Dirty
aii
cleaner
Mixture
too
rich
Engine
over
run
Stuck choke valve
Overchoking
Shortage
of
engine
oil
Low
oil pressure
Poor
quality
of
engine
oil
Rough
surface of craokshaft
Clogged
oil
passage
Bearing
worn or
eccentric
Bearingimproperly
assembled
Loose
bearing
Connecting
rod
alignment
incorrect
Shortage
of
engine
oil
Low
oil
pressure
Poor
quality
of
engine
oil
Craokshaft
journal
worn or
out
of
round
Clogged
oil passage
in
crankshaft
Bearing
worn or
eccentric
Bearing improperly
assembled
Eccentric craokshaft
or
bearing
EM 32
Corrective
action
Adjust
Replace
Replace
valve
Reface
Repair
or
replace
Drive
at
proper
speeds
Repair
Add
or
replace
oil
Clean
crankcase
replace
oil and
oil
niter
element
Use
right
oil
Repair
or
replace
Repair
or
replace
Adjust
Replace
Clean
Adjust
Drive
at
proper
speeds
Clean and
adjust
Start
correct way
Add oiL
Correct
Use proper oil
Grind and
replace
bearing
Clean
Replace
Correct
Replace
Repair
or
replace
Add
or
replace
Correct
Use proper
oil
Repair
Clean
Replace
Correct
Replace
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