Piston, Engine

Piston
Diameter - coated
Grade 1 88.990-89.010 mm (3.5035-3.5043 inch)
Grade 2 88.998-89.022 mm (3.5039-3.5048 inch)
Grade 3 89.010-89.030 mm (3.5043-3.5051 inch)
Diameter - uncoated
Grade 1 88.970-88.980 mm (3.50275-3.50314 inch)
Grade 2 88.978-88.992 mm (3.50306-3.50362 inch)
Grade 3 89.010-89.030 mm (3.50432-3.50511 inch)
Piston-to-cylinder bore clearance 0.012 to 0.022 mm (0.0005-0.0009 inch)
Ring end gap
Compression (top, gauge diameter)a 0.100-0.250 mm (0.0039-0.0098 inch)
Compression (bottom, gauge diameter) 0.27-0.42 mm (0.0106-0.0165 inch)
Oil ring (steel rail, gauge diameter) 0.15-0.65 mm (0.0059-0.0255 inch)
Ring end gap - max
Compression (top, service limit) 0.50 mm (0.0196 inch)
Compression (bottom, service limit) 0.65 mm (0.0255 inch)
Oil ring (steel rail, service limit) 0.90 mm (0.0354 inch)
Ring groove width
Compression (top) 1.230-1.245 mm (0.0484-0.0490 inch)
Compression (bottom) 1.530-1.545 mm (0.0602-0.0608 inch)
Oil ring 3.030-3.055 mm (0.1192-0.0120 inch)
Piston pin
Bore diameter 21.008-21.012 mm (0.8270-0.8272 inch)
Pin diameter 21.011-21.013 mm (0.8271-0.8273 inch)
Pin length 60.51-60.08 mm (2.382-2.365 inch)
Pin-to-piston fit 0.002 to 0.009 mm (0.00007-0.0003 inch)
a Specification 82.4 mm (3.2441 inch) diameter gauge