Mercury 4F1Z-6148-CA Kit - Piston Ring

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If the gap is too small, it must be enlarged or the ring ends may come in contact with each other during engine operation, which can cause serious damage to the engine. The end gap can be increased by filing the ring ends very carefully with a fine file. Mount the file in a vise equipped with soft jaws, slip the ring over the file with the ends contacting the file face, and slowly move the ring to remove material from the ends. When performing this operation, file only from the outside in.

If the gap is too small, it must be enlarged to prevent the ring ends from contacting each other during engine operation, which can cause serious damage. The end gap can be increased by carefully filing the ring ends with a fine file, filing only from the outside in.