Piston, Engine

Dimensional Specifications

Component Illustration (B235E/R):

Piston Types:
Dimension R 50 mm
Dimension O 70 mm
Dimension A 3.8 mm
Dimension H 56.9 mm

Classification Of Pistons And Cylinder Bores:
First oversize (+0.5 mm)
Second oversize (+1.0 mm)

The piston classification is stamped on the piston crown roof.
The piston classes for service are B

Piston Classification:
AB 89.964 - 89.975 mm
B 89.975 - 89.982 mm
First oversize (+0.5) 90.457 - 90.475 mm
Second oversize (+1.0) 90.957 - 90.975 mm

Piston Diameter:
Piston diameter is measured at right angles to the gudgeon pin holes, 11 mm from the bottom of the piston.

Piston Clearance:
Nominal 0.025 - 0.056

Classification, Piston/Cylinder - Fits Cylinder Bore:
A/B piston fits both A and B cylinder bores 90.000 - 90.020 mm
B piston 90.007 - 90.020 mm
Permitted piston clearance 0.025 - 0.056 mm