Symptom
|
Probable cause
|
Remedy
|
Crankshaft
bearing knock
|
Worn main
bearing Seized bearing Bent crakshaft Excessive
crankshaft end play
|
Replace Repalce Replace Replce thrust
bearing
|
Piston and
connecting rod knock
|
Worn
bearing Seized bearing Worn piston pin
Worn
piston in cylinder Broken piston
ring Improper connecting rod
alignment
|
Replace Repalce Replace piston and pin
or connecting rod Recondition
cylinder Replace Repalce
|
Noisy
valves
|
Faulty
auto-lash adjuster Thin or diluted engine
oil (low oil pressure) Worn or damaged
valve stem or valve guide
|
Replace Change Repalce
|
Excessively worn
cylinder and piston
|
Shorted or
engine oil Dirty engine
oil Poor quality of engine
oil Improperly assembled piston and
connecting rod Improper piston ring end
clearance Dirty air
cleaner
|
Add or
replace Repalce Use proper oil Repair or
replace
Replace Clean air cleaner assembly and replace the air
filter
|
Connecting rod
and main bearing noise
|
Insufficient
oil supply Thin or diluted engine
oil Excessive bearing
clearnace
|
Check engine
oil level Change and find out
cause Replace
|
Damaged
crankshaft bearing
|
Shorted of
engine oil Low oil
pressure Poor quality of engine
oil Worn or out-of-round of crankshaft
journal Restricted oil passage in
crankshaft Worn
bearing
Faulty oil
pump Bearing improperly
installed Non-concentric crankshaft or
bearing
|
Add or
replace Adjust or repair Use proper engine oil Replace Clean Replace bearing and check engine oil and lubrication
system Repair or replace Repaur or replace Replace
|
Timing belt
noise
|
Incorrect belt
tension
|
Adjust belt
tension
|
Low
compression
|
Damaged
cylinder head gasket Worn or damaged
piston rings Worn piston or
cylinder
Worn or damaged valve
seat
|
Replace
gasket Replace rings Repair or replace piston and/or cylinder
block Repair or replace valve and/or seat
ring
|
Oil pressure
drop
|
Low engine oil
level Faulty oil pressure
switch Clogged oil filter Worn oil pump gears or cover Thin or diluted engine oil Oil
relief valve stuck (open) Excessive
bearing clearance
|
Check engine
oil level Repalce Replace Replace Change and find out
cause Repair Replace
|
High oil
pressure
|
Oil relief
valve stuck (closed)
|
Repair or
replace
|
Excessive engine
rolling and vibration
|
Misfire Loose engine roll
stopper (front, rear) Loose transaxle
mount bracket Loose center
member Broken transaxle mount
insulator Broken engine mount
insulator Broken engine roll stopper
insulator
|
Correct Re-tighten Re-tighten Re-tighten Re-tighten Replace Repalce or
repalce
|
Low coolant
level
|
Leakage of
coolant Damaged radiator core
joint Corroded or cracked hoses (Radiator
hose, heater hose, etc.) Faulty radiator
cap valve or setting or spring Faulty
thermostat Faulty engine coolant
pump
|
Correct Replac Replace
Replace Repacle Repalce
|
Clogged
radiator
|
Foreign
material in coolant
|
Replace
|
Abnormally high
coolant temperature
|
Faulty
thermostat Faulty radiator
cap Restriction of flow in cooling
system Loose or missing drive
belt Faulty engine coolant
pump Faulty thermostat seder or
wiring Faulty electric
fan Faulty thermo-sensor on
radiator Insufficient
coolant
|
Replace
parts Replace Clear restriction or replace parts Adjust or replace Replace Repair or
repalce Repair or replace Replace Refill
coolant
|
Abnormally low
coolant temperature
|
Faulty
thermostat Faulty temperature gauge or
wiring
|
Replace Repair or
replace
|
Leakage from oil
cooling system
|
Loose hose and
pipe connection Blocked or collapsed hose
and pipe
|
Replace Repair or
replace
|
Inoperative
electrical cooling fan
|
Damaged Loose pipe or in
operative sensor
|
Replace or
repair Repair or replace
|
Exhaust gas
leakage
|
Loose
connections Broken pipe or
muffler
|
Re-tighten Repair or
replace
|
Abnormal
noise
|
Detached
baffler plate in muffler Broken rubber
hanger Pipe or muffler contacting vehicle
body Broken pipe or muffler
|
Replace Replace Correct Repair or
replace
|