There are several possible sources of abnormal sounds in the compressor, depending on the system part that failed: 1. Abnormal sound in compressor crankcase a) Excessive clearance of crankpin metal/piston pin bearing and main bearing b) Improper tightening of crankpin bolt/balance may mounting bolt c) Foreign matter trapped in the crankcase and the balance weight/crank arm, etc. are hitting it. Remove the foreign matter. 2. Abnormal sound from the compressor cylinder a) Insufficient cylinder top clearance causing hitting to the cylinder wall. b) Broken pieces of the valve plate or piston ring in the cylinder. c) Blow by sound of air due to abnormal wear of piston rings. 3. Echoing of abnormal sound at compressor valve seata) Inlet/discharge valve is the source of the noise: Valve plate and valve spring are damaged. Check the inlet/discharge valve and repair or replace. b) Foreign matter in inlet/discharge valve c) Valve spring is stuck or cracked. d) Valve vibrates because cylinder cover bolt is not properly tightened. 4. Abnormal sound in compressor oil separator Foreign matter or broken parts debris trapped in the separator 5. Abnormal sound in compressed air piping Foreign matter or broken parts debris trapped in the piping |