ENGINE
WG972-E4, WSM
1-S4
: Refer to Diagnosis Manual
9Y1211108ENS0118US0
Lubricant Oil
Consumption Is
Excessive
1. Oil leakage from oil seal,
gasket, etc.
Replace –
2. Damaged valve stem seal Replace 1-S29
3. Piston ring and liner worn
or stuck
Replace 1-S50,
1-S56
Engine Overheats 1. Insufficient engine oil Check engine oil level G-11
Refill oil as required G-10
2. Fan belt broken or
elongated
Check and adjust fan belt or replace 1-S17
3. Coolant insufficient Refill coolant G-25, G-26
4. Excessive concentration of
antifreeze
Add water only or change to coolant with
the specified mixing ratio
G-26
5. Radiator net or radiator fin
clogged with dust
Clean net or fin carefully –
6. Inside of radiator or
coolant flows route
corroded
Clean or replace radiator and parts G-25
7. Damaged fan or radiator or
radiator cap
Replace damaged parts –
8. Damaged thermostat Check thermostat and replace 1-S17
9. Damaged temperature
sensor
Check temperature with thermometer
and replace
1-S23
10.Overload running Reduce load –
11.Head gasket damaged or
water leakage
Replace –
Engine Noise 1. Improper valve clearance Adjust 1-S15
2. Spark knock due to low
octane fuel or carbon
Use higher-octane fuel and remove
carbon
1-S20,
1-S21,
1-S40
3. Rattles from loosely
mounted external
components
Retighten –
Exhaust Flames 1. Damaged spark plug Check and adjust or replace 1-S20,
1-S21
2. Damaged ignition coil Check and replace 1-S21
3. Wires disconnection or
damaged
Check the wire harness –
Reconnect or replace –
4. Bad connection of ignition
coil and spark plug
Reconnect –
Symptom
Probable Cause and
Checking Procedure
Solution
Reference
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