Fitting Pistons
- Measure cylinder bore at top, bottom and center of piston travel. Measure in line with and at 90 degrees to crankshaft. Standard bore is 3.6220-3.6232" (91.998-92.029 mm) with a wear limit of .0008" (.020 mm). Maximum out-of-round is .0008" (.020 mm). Maximum taper is .0004" (.010 mm).
- Measure piston at right angle to pin and just below oil ring groove. If not within specification, rebore cylinder and/or replace pistons. On 22R and 22R-E engines, pistons are available in .50 mm and 1.00 mm oversize diameters.
PISTON SIZE CHART
| Application | In. (mm) | |
|---|---|---|
| 22R & 22R-E | ||
| Standard | 3.6196-3.6208 (91.938-91.968) | |
| 0.5 mm O/S | 3.6393-3.6405 (92.438-92.468) | |
| 1.0 mm O/S | 3.6590-3.6602 (92.938-92.968) | |
| 22R-TE | 3.6195-3.6207 (91.935-91.965) | |