Piston, Engine

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