Fitting Pistons
- Cylinder bore can be measured using a cylinder gauge. Measurement must be taken at 3 depths and 2 angles as shown in Fig 1. Difference between minimum and maximum value is actual wear. If cylinder bore wear is 0.006" (0.15 mm) or more, all cylinders must be rebored. If cylinder is honed or rebored, oversized pistons and rings are available in 0.010" (0.25 mm) 0.020" (0.50 mm) 0.030" (0.75 mm) and 0.040" (1.00 mm) oversizes.
Courtesy of MAZDA MOTORS CORP.
- Carefully inspect pistons and replace those severely damaged due to scoring, scratching or burning. Measure pistons at points A, B, and C as shown in Fig 2, using a micrometer. If piston is not within specifications, replace piston and rebore cylinder.
Courtesy of MAZDA MOTORS CORP.
STANDARD PISTON SPECIFICATIONS
| Application |
Diameter In. (mm) |
| 1490 cc |
| |
A |
3.0297-3.0305 (76.954-76.974) |
| 1970 cc |
| |
A |
3.1474-3.1482 (79.944-79.964) |
| |
B |
3.1489 (79.980) |
| |
C |
3.1319 (79.550) |