Air Compressor Overhauling & Important points to be checked

Overhauling of Air compressors Remove the cylinder head after disconnecting all connections, Remove all the air valves for both stage suction and delivery. Check the condition of valve by properly cleaning it and then using a steel check the valve plate by pressing it. Leakage past the valve also  can be checked, if not satisfied overhaul or replace. Now remove both cooler covers and remove coolers, clean both jackets and coolers. Inside of the cylinder to be checked for improper wear or scoring and also the working of lubricator to be checked. The piston can be removed by removing the rod cap from the con rod and screwing in the piston removing tool on top, it should be carefully removed without damaging the crank pin or cylinder.Now inspect piston rings and oil scraper rings and replace if necessary . Lubricating pump also can be removed and checked for proper function.   Important points Drain off lubricating oil and replace with new.  All running gear nuts must be tightened to prescribed torque.  Lubricating pump filters to be checked.  Check the bearings for white metal whipping and check whether white metal has entered any oil holes.  If bearings are replaced check the bumping clearance.   Cylinder Rod cap , Bearings and Rod bolt Piston and valves After cooler Inter cooler