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3. Piston knocking noise causes and troubleshooting
Troubleshooting
Main bearing oil channel depth and width
misalined or insufficient oil pressure result
in poor lubrication of the cylinder wall
Repair or adjust the oil pressure to
specification
Excessively big clearance between the
iston and the cylinder wal
Replace the piston to resume the normal
clearance
Connecting rod ben
Correct or replace the connecting ro
Connecting rod journal is not parallel with
the main journa
Replace the connecting rod
Connecting rod bushing axial declination Replace the bushin
Pistion counter ellipse Replace the piston
Excessively small clearance between the
Repair the cylinder or replace the piston
Excessively small backlash and end gap for
the piston ring.
Repair or replace the piston ring
Poor lubrication for cylinder wall and piston
Dredge the oil line to improve the
lubricant splashing problem
Piston pin and connecting rod end are
installed too tightly
Adjust piston pin tension to normal level
Connecting rod bearing is assembled too
tightly
Adjust the bearing tension to normal level
Piston skirt ovality is too bi
Replace the piston with normal ovalit
Knock when
engine is cold
Knock when
engine is hot
Knock no
matter the
engine is cold
or hot
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