Piston Dimensions and Clearances

PISTON DIMENSIONS
R: 257 mm (10.12 inch)
O: 75 mm (2.95 inch)
A: 3.05 mm (0.120 inch)

PISTON CLASSIFICATION
The piston classification code is stamped on the piston crown.
The codes for servicing are:
AB
B
C
The cylinder classification code is stamped on the block adjacent to each cylinder. Cylinder classification codes are:
A
B
B+
All three cylinder classes may occur in the same block.

PISTON SIZES
Standard:
A: 89.971-89.980 mm (3.5449-3.5452)
AB: 89.980-89.989 mm (3.5452-3.5456)
B: 89.989-90.000 mm (3.5429-3.5432)
C: 90.000-90.013 mm (3.5460-3.5465)
Oversize:
First (0.5 mm): 90.472-90.488 mm (3.5646-3.5652)
Second (1.0 mm): 90.972-90.988 mm (3.5843-3.5849)

PISTON CLEARANCE
Nominal: 0.011-0.041 mm (0.0004-0.0016)