Engine noise can sometimes through a tear down a of the injector piston and be separated. If the noise volume to reduce or disappear, the noise and it is in that particular engine cylinder relevant. To determine the source of the noise is no fixed rules or test method, driven by the engine parts and accessories, such as gear drive fan clutch, hydraulic pump, driving belt of charging machine, air conditioning compressor and the supercharger may constitute the noise of the engine. The following information can be used to guide the diagnosis engine noise:

1, link bearing noise: connecting rod gap will cause the engine in excess of rotating speed, namely the idle speed and load conditions made noise knock. When bearing began to become loose, noise can the and pistons beat--or loose the piston pin noise confusion together. The volume of the noise of the engine speed increase. Low oil pressure will also with this produce.

2, the piston noise: the most difficult is that the piston pin, connecting rod, and the difference between the piston noise. Loose the piston cause click knock, usually in engine idling operation can be heard. When the cylinder is the injector removed, the percussive sound will be obvious change in. However, in some engines, when the vehicle with the speed of the stability of the road, the percussive sound instead become more apparent.

3 and the Lord bearing noise: the main bearing generated percussive loose in the engine noise can be heard with load, it noise and dreary. If all the main bearing all loose, will hear is loud and short knock. This kind of knock is regular, and with the speed and change. When the engine load drag or overloaded road, the noise the percussive sound most clangorous than connecting rod noise depressing. Low oil pressure will also with this produce.

 
If bearing no loose enough to be able to produce their own separate percussive sound, if oil is too thin or bearing no oil, bearing can produce striking the noise.



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