Fitting Pistons
WARNING: This page is about a different car, the 2002 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
- Different piston and cylinder bore sizes are used. Piston diameter is determined by size mark ("1", "2" or "3") stamped on top of piston. Cylinder bore diameter is determined by size mark ("1", "2" or "3") stamped on cylinder block deck surface near each respective cylinder. See Fig 1.
- To determine piston-to-cylinder clearance, measure piston diameter and cylinder bore diameter. Measure piston skirt diameter 1.04 in. (26. mm) from top of piston, at 90 degree angle to piston pin. Ensure piston diameter is within specification. See PISTONS, PINS & RINGS table under ENGINE SPECIFICATIONS.
- Using cylinder gauge, measure cylinder bore at positions "A", "B", and "C" in axial thrust directions. See Fig 2. Ensure cylinder bore diameter, taper and out-of-round measurements are within specification. See CYLINDER BLOCK table under ENGINE SPECIFICATIONS. Replace cylinder block if cylinder bore diameter exceeds specification.
- Determine piston clearance. If clearance is not within specification, replace piston or cylinder block. See PISTONS, PINS & RINGS table under ENGINE SPECIFICATIONS.