1. Measure piston diameter 1.68″ (42.7 mm) below lower land of oil ring at 90 degree angle to piston pin. Replace piston if piston diameter is not within specification. See PISTONS, PINS & RINGS table under ENGINE SPECIFICATIONS.
2. Measure cylinder bore diameter at top, middle and bottom of cylinder bore parallel with crankshaft and at a 90 degree angle to crankshaft. Ensure cylinder bore diameter, out-of-round and taper are within specification. See CYLINDER BLOCK table under ENGINE SPECIFICATIONS.
3. Ensure piston clearance is within specification. See PISTONS, PINS & RINGS table under ENGINE SPECIFICATIONS. If piston clearance is not within specification, hone or bore cylinders on cylinder block for oversize pistons. Pistons are available in .010″ (.25 mm), .020″ (.51 mm) and .030″ (.76 mm) oversize.