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Piston Rings

  1. Measure piston ring side and end clearance for all pistons. Replace rings as necessary. When replacing rings in cylinder bore not needing reconditioning, check ring end gap at lower part of cylinder that is less worn.
  2. When replacing rings, ensure that same size ring is installed. Install rings on piston with end gaps staggered at 120 degree intervals. Ensure that ring gap is not in line with thrust face of pin bore. Manufacturer's marks face upward when rings are installed. See Figure .
CAUTION: Install oil ring first without using a ring expander. Spacer gap should be installed more than 45 degrees from side rail gaps. Rails should turn smoothly when installed.
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