Pistons-Fitting

Pistons are machined to two different weight specifications and matched to rods based on weight. All piston and rod assemblies weigh the same to maintain engine balance.

FITTING PISTONS





Fig. 21

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

PISTON PINS
The piston pin is full floating and is held in place by lock rings. Pistons and rods are weight matched for balance. Do Not switch pistons with other rods. Piston and Rods are serviced as an assembly for balance.