There are many reasons why diesel engines sound bad, and the solutions are also different.
When you step on the accelerator pedal to accelerate, a "clang" sound is produced, just like hitting the cylinder wall with a hammer. The abnormal sound produced by the engine during combustion occurs when the engine rotates at a specific speed. This sound can be eliminated through adjustment.
When the engine is running, there are various types of harsh sounds such as "chirp, chirp" and "knocking" when the rotational resistance is large. sound. The abnormal sound that occurs when the engine is running increases with the change of engine speed. Common continuous abnormal noises include: the grinding sound when the fan belt is loose or damaged, the sound of damaged generator bearings and water pump bearings, the sound of poor meshing of the timing gear, etc. Solution: Replace with new spare parts.
The knocking sound in the engine is mostly caused by abnormal mechanical parts of the engine, which is a relatively serious abnormal sound. Common abnormal engine noises include the knocking sound of the piston; the knocking sound of the crankshaft bearing (large tile sound); the knocking sound of the connecting rod bearing (small tile sound); the knocking sound of the piston pin; the tapping sound of the valve foot, etc. . The above-mentioned sounds are all manifested as rhythmic metal knocking sounds. When the above-mentioned abnormal noise occurs (except for the valve foot noise), a serious fault occurs and must be sent to the factory for repair immediately.