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Fitting Pistons

  1. Determine if piston-to-cylinder clearance is within specification. See PISTONS, PINS & RINGS table under ENGINE SPECIFICATIONS. Measure the piston skirt diameter at 1.22" (31.0 mm) from top of piston, at a 90-degree angle to piston pin. Different piston sizes are used. Piston size can be identified by letter (size mark) stamped on top of piston. See Fig 1.
  2. Size mark on piston is a letter corresponding to piston diameter. Ensure piston diameter is within specification. See PISTONS, PINS & RINGS table under ENGINE SPECIFICATIONS.
  3. Check cylinder bore to determine piston-to-cylinder clearance. Clearance should be within specification. See PISTONS, PIN & RINGS table under ENGINE SPECIFICATIONS.
Fig 1: Identifying Piston & Connecting Rod Size
G93A01603Courtesy of ISUZU MOTOR CO.
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