39
Condition Possible cause Correction
Engine noise
Note: Before check-
ing the mechanical
noise, make sure
that:
Specified
spark plug is
used.
Specified
fuel is used.
Crankshaft noise
1. Worn–down bearings, resulting in excessively large
running clearances
2. Worn connecting–rod bearing
3. Distorted connecting rods
4. Worn crankshaft journals
5. Worn crankpins
Replace
Replace
Repair or replace
Replace by grinding, or
replace crankshaft
Repair by grinding, or replace
crankshaft
Engine noise
Note: Before check-
ing the mechanical
noise, make sure
that:
– Specified spark
plug is used.
– Specified fuel is
used.
Noise due to piston, rings, pins or cylinders
1. Abnormally worn cylinder bores
2. Worn pistons, rings or pins
3. Pistons tending to seize
4. Broken piston rings
Others
1. Excessively large camshaft thrust play
2. Excessively large crankshaft thrust cleaner
3. Valve clearance too large
4. Not enough engine oil
Rebore to next over size
or replace
Replace
Replace
Replace
Replace
Adjust as prescribed
Adjust as prescribed
Replenish
To Next Page
Loading...
