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|Mike JR||I recently had to have the head of the perkins rebuilt, new valves, seats and guides. when I went to clean off the carbon buildup on the piston heads and cylender walls I found aluminum melted onto the cylender wall in #1 cylender. It was in two spots on opposite sides of the cylender. The corresponding top edge of the piston was melted. the damage was about 1.5 inches long in both spots. Some of the aluminum came free of the cylender wall but most was melted right on. The cylender walls were smooth blow thr combustion area. This machine has never used a drop of oil ( that I could detect ). I assumed that the rings were intact. I am guessing that a faulty injector could spray fuel to create hot spots. The injectors have been cleaned and the pressure reset so I am hoping the problem is solved. I would rather not pull out the piston. Any ideas?