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Home >> Mitsubishi >> 1987 >> Van LS >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 1.8L 4-CYL - VIN [G], 2.0L 4-CYL [D], 2.4L 4-CYL [L] >> Removal & Installation >> Piston & Connecting Rod Assembly >> Piston Ring Installation

Piston Ring Installation

  1. Measure piston ring side and end clearance for all pistons and replace rings as necessary. When replacing ring in cylinder bore not needing reconditioning, check ring end gap at lower part of cylinder that is less worn.
  2. When replacing a ring, be sure to use same size ring. Compression rings differ in scraping edge design. From a cross sectional view, ring No. 1 has a barrel shaped scraping edge and ring No. 2 has a tapered edge.
  3. Install rings on piston with end gaps staggered at 120 degrees intervals. Ensure no ring gap is in line with thrust face of pin bore. Also ensure manufacturer's marks are facing upward when rings are installed. See Fig 1.
    Fig 1: Positioning Piston Ring Gaps Stagger ring gaps to minimize compression loss.
    G82070
  4. Install oil ring first without using a ring expander. Spacer expander gap should be installed more than 45 degrees from side rail gaps. Rails should turn smoothly when installed.
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