How to Select Piston and Bearing: Description

PISTON AND BEARING SELECTION METHODS

Selection points

Selection parts

Selection items

Selection methods

Between cylinder block and crankshaft

Main bearing

Main bearing grade (bearing thickness)

Determined by match of cylinder block bearing housing grade (inner diameter of housing) and crankshaft journal grade (outer diameter of journal)

Between crankshaft and connecting rod

Connecting rod bearing

Connecting rod bearing grade (bearing thickness)

Combining service grades for connecting rod big end diameter and crankshaft pin outer diameter determine connecting rod bearing selection.

Between cylinder block and piston

Piston and piston pin assembly (piston is available together with piston pin as an assembly.)

Piston grade (piston skirt diameter)

Piston grade = cylinder bore grade (inner diameter of bore)

Between piston and connecting rod⁽¹⁾

⁽¹⁾	For the service parts, the grade for fitting cannot be selected between piston pin and connecting rod. (Only grade "0" is available.) The information at the shipment from the plant is described as a reference.

The identification grade stamped on each part is the grade for the dimension measured in new condition. This grade cannot apply to reused parts.
For reused or repaired parts, measure the dimension accurately. Determine the grade by comparing the measurement with the values of each selection table.
For details of the measurement method of each part, the reuse standards and the selection method of the selective fitting parts, follow the applicable procedures.