The main engine piston is hydraulically tested whenever the piston rod or the piston is being renewed or when the piston is cleaned internally. The piston and piston rod are assembled with new joints and proper sealing rings for the internal oil pipe connection. The assembled piston with the rod is then tested hydraulically with a hand hydraulic pump with the outlet cooling oil connection blanked The blank connection at the outlet end will have a screwed plug to remove air and after removal of air the plug is tightened. The pressure is built up gradually by slow strokes of the pump till the pressure is about 50 percent in excess of the lube oil pressure. The pressure should be kept for about 30 minutes and all the joint locations examined for leaks. The water is then drained out and compressed air blown through so that the internal portion is thoroughly dried out.
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