Many owners will gain experience in driving slowly, but for some of the failures of the engine pistons still need to first understand the cause of the problem may occur, to shorten the inspection time to get timely maintenance. Knocking engine piston ring such as whether there is a kind of manifestation, how to overhaul the reason why, uh hung ball joint work with you to understand the objective sense.

Symptom:
1, when the engine is idling, hear, Da, Da, Da, a continuous metal percussion.
2, the engine temperature is low sound great, the sound is reduced or disappear when the temperature rises.

Cause:
1, the piston and cylinder wall wear gap is too large.
2, the rod bent.
3, the piston pin assembly for its tight and deformation.
4, connecting rod bearing assembly tight.

Remedy:
1, at low engine speeds, gradually off the fire test, the noise diminished or disappeared off the fire, that is the sound of the cylinder.

2, when idling, Knocking sound obvious and clear; With the engine temperature rises above or speed in speed, sound diminished or disappeared.

3, remove the spark plug to the cylinder filling small amount of concentrated oil from the spark plug hole, after oil injection, starter drive with the number of rotations of the crankshaft, piston and cylinder wall clearance is filled lubricant film, and then start the engine, if the start After a moment the sound significantly decreased or disappeared, but with the loss or ablative film, sound there soon, can prove to be the knock-cylinder sound.