Piston, Engine

PISTON DIMENSIONS
R: 149 mm (5.8706 inch)
O: 70 mm (2.7580 inch)
A: 4.4 mm (0.1734 inch)
H: 58.3 mm (2.2970 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 (3.5456-3.5460)
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): G90.972-90.988 mm(3.5843-3.5849)

PISTON CLEARANCE
Nominal: 0.011-0.040 mm (0.0043-0.0158)
A/A: 0.020-0.041 mm (0.0079-0.0160)
AB/A: 0.011-0.032 mm (0.0043-0.0013)
AB/B: 0.014-0.040 mm (0.0097-0.0158)
B/B: 0.006-0.031 mm (0.0024-0.0012)
B/B+ 0.011-0.041 mm (0.0043-0.0160)

NOTE: Piston diameter Piston diameter is measured at right angles to the wrist pin boss, 9.3 mm from the bottom of the piston skirt.

WRIST PIN
Diameter: 23.996-24.000 mm (0.9447-0.9448 in)
Fit: 0.005-0.014 mm (0.0023-0.0097)

RING GROOVE CLEARANCE
First Ring: 0.050-0.082 mm (0.0019-0.0032 inch)
Second Ring: 0.040-0.072 mm (0.0016-0.0028 inch)