Why is there a noise in the crankcase of the air compressor? What is the reason?

1. It may be that the connecting rod bolt is not tightened, so it should be tightened in time

2. The connecting rod bush may be excessively worn and should be replaced in time

3. Check whether the curved bearing is damaged and replace it in time

4. Check whether the oil deflector on the crankshaft is loose and replace it in time

5. Check whether the flywheel in the crankcase is not installed tightly and tighten it in time

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