Piston and Ring Fitting

FITTING PISTONS





Fig. 22





Fig. 21

The piston and cylinder wall must be clean and dry. Piston diameter should be measured 90 degrees to piston pin at size location shown in (Fig. 22). Cylinder bores should be measured halfway down the cylinder bore and transverse to the engine crankshaft center line shown in (Fig. 21). Refer to Engine; Specifications. Pistons and cylinder bores should be measured at normal room temperature, 70°F (21°C).

FITTING RINGS





Fig. 23

1. Wipe cylinder bore clean. Insert ring and push down with piston to ensure it is square in bore. The ring gap measurement must be made with the ring positioning at least 12 mm (0.50 inch) from bottom of cylinder bore. Check gap with feeler gauge (Fig. 23). Refer to Engine; Specifications.





Fig. 24

2. Check piston ring to groove clearance: (Fig. 24). Refer to Engine; Specification.