106
Abnormal noise during engine operation
Possible causes
Remedies
1) Connecting rod bearing bushing and main
bearing bushing are worn-out and clash voice
appears in the crankcase.
1) Dismantle and check the bushing and, if necessary,
replace it and keep the reasonable clearance as
required.
2) The Damper is damaged and invalid.
2) Change components to keep regulated axial
clearance
3) The shock absorber is damaged and
ineffective
3) Check and see if the joint bolts are in good
conditions, and change new ones if necessary.
4) The valve knocks on the piston
4) Check and adjust the valve timing.
5) The driving gear is abrased and get too large
gap. There is knocking sound at the timing
gear box cover.
5) Check the gear side clearance and change the gear
or not according to the abrasion situations.
6) Too big clearance between piston and cylinder
and there is knocking sound at the cylinder
wall.
6) Change the piston and use the repairing cylinder
liner. Keep the proper clearance between piston and
cylinder.
7) Puff vibration of supercharger
7) Remove the carbon and waste in the compressor
channel and the exhaust channel.
8) The bearing of supercharger is damaged and
the rotor knocks on the shell
8) Change the supercharger assembly
9) The valve clearance is too large and there is
big noise at the cylinder head.
9) Adjust the valve clearance.
