Piston: Service and Repair

HOW TO SELECT PISTON AND BEARING


Piston


WHEN NEW CYLINDER BLOCK IS USED





Check the cylinder bore grade ("1", "2" or "3") on rear side of cylinder block, and select piston of the same grade.

A : Bearing housing grade No. 1
B : Bearing housing grade No. 2
C : Bearing housing grade No. 3
D : Bearing housing grade No. 4
E : Cylinder bore grade No. 1
F : Cylinder bore grade No. 2
G : Cylinder bore grade No. 3
H : Cylinder bore grade No. 4
I : Cylinder bore grade No. 5
J : Cylinder bore grade No. 6
K : Identification

Arrow: Engine Front


NOTE:
Piston is available with piston pin as a set for the service part. (Only "0" grade piston pin is available.)

WHEN NEW CYLINDER BLOCK IS REUSED
1. Measure the cylinder bore inner diameter. Inspection.





2. Determine the bore grade by comparing the measurement with the values under the cylinder bore inner diameter of the "PISTON SELECTION TABLE".

A : RH
B : LH
C : Piston pin grade number
D : Piston grade number
E : Front mark
F : Identification code

3. Select piston of the same grade.

PISTON SELECTION TABLE






NOTE:
- Piston is available together with piston pin as assembly.
- Piston pin (piston pin hole) grade is provided only for the parts installed at the plant. For service parts, no piston pin grades can be selected. (Only "0" grade is available.)
- No second grade mark is available on piston.