Piston Pin Replacement
- With piston and rod assembly removed, remove circlips from piston pin hole in piston. Drive out piston pin and separate piston from connecting rod. Thoroughly clean and inspect rod and piston.
- Pistons and pins are installed as a matched set only. Pin class may be coded by white or black marking for standard or blue for oversize pins.PISTON PIN CLASS DESIGNATION
Application Pin Diameter In. (mm) White 8660-.8661 (21.997-22.000) Black 8659-.8661 (21.994-21.997) Blue 8661-.8663 (22.000-22.005) - Classes of pins and pistons must not be interchanged. If piston or pin is replaced, it must be replaced with one of a corresponding class and weight. Weight classification is designated by a " + " or a "-" stamped in top of piston.
- Check pin-to-piston clearance, if clearance exceeds that specified and pin is not worn, replace piston. Check pin-to-rod clearance, if clearance exceeds that specified, depending on pin class, new bushing must be installed.
- Press out old bushing and install new one with split in bushing rotated 90° from oil hole in connecting rod. Drill through oil hole in connecting rod. Ream bushing to specified clearance with piston pin.
- If connecting rod is replaced, replace with rod which is within 4 grams of rod being replaced. Position piston on connecting rod with arrow on piston facing in same direction as oil hole in connecting rod. Lubricate and install piston pin and circlips.