How to Select Piston and Bearing
How to Select Piston and BearingDESCRIPTION
^ 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, refer to the text.
HOW TO SELECT PISTON
Piston Selective Fitting When New Cylinder Block is Used:
^ Check the cylinder bore grade on the bottom face of the cylinder block, and select the piston of the same grade.
When Cylinder Block is Reused
1. Measure cylinder block bore diameter.
2. Determine the bore grade by comparing the measurement with the values under the "Cylinder bore diameter" of the piston selection table. Use oversized piston if the clearance of standard grade piston is outside the specified value.
Piston Selection Table
Piston Selection Table:
CAUTION: Oversize must be used in all cylinders when using oversized parts.
Piston oversize (Service): 0.20 mm (0.0079 in)
NOTE:
^ The piston is available together with piston pin as an assembly.
^ The piston pin (piston pin bore) grade is provided only for the parts installed at the plant. For service parts, no grades can be selected (only 0 grade is available).
^ Hone the cylinder to obtain specified clearance between the piston and cylinder bore when using an oversized piston. Be sure to use the same oversized piston rings.