Piston, Engine

The Piston Diameter is measured at the piston pin bore, centerline, 90° to the pin.
Piston Diameter Coded Red 95.961-95.9776 mm (3.7780-3.7786 in.)
Piston-To-Bore-Clearance (Select Fit) 0.036-0.056 mm (0.0014-0.0022 in.)
Piston Bore Diameter of:
89.009-89.035 mm (3.5043-3.5053 in.) Coded Red Service Piston Required
89.035-89.060 mm (3.5043-3.5063 in.) Coded Blue Service Piston Required
89.060-89.086 mm (3.5063-3.5073 in.) Coded Yellow Service Piston Required
Piston Pin Bore Diameter 23.1725-23.1800 mm (0.9123-0.9126 in.)
Piston Pin Length 76.5-77.2 mm (3.01-3.04 in.)
Piston Pin Diameter (Standard) 23.162-23.175 mm (0.9119-0.9124 in.)
Piston Pin Diameter (0.001 Oversize) 23.193-23.198 mm (0.9130-0.9133 in.)
Piston Pin Diameter (0.002 Oversize) 23.216-23.223 mm (0.9140-0.9143 in.)
Piston-to-Pin Clearance 0.005-0.010 mm (0.0002-0.0004 in.)
Pin-to-Rod Clearance Interference Fit
Piston Ring Groove Width
Compression Ring Groove Width (Top) 2.032-2.057 mm (0.080-0.081 in.)
Compression Ring Groove Width (Bottom) 2.032-2.057 mm (0.080-0.081 in.)
Oil Ring Groove Width 4.801-4.826 mm (0.189-0.190 in.)
Piston Rings
Compression Ring Width (Top) 1.475-1.490 mm (0.056-0.059 in.)
Compression Ring Width (Bottom) 1.475-1.490 mm (0.056-0.059 in.)
Compression Ring Side Clearance (Top) 0.051-0.101 mm (0.0020-0.0040 in.)
Compression Ring Side Clearance (Bottom) 0.051-0.101 mm (0.0020-0.0040 in.)
Oil Ring Side Clearance Snug Fit
Piston Ring Side Clearance Service Limit 0.15 mm (0.006 in.) (Max)
Compression Ring Gap (Top) 0.25-0.50 mm (0.010-0.020 in.)
Compression Ring Gap (Bottom) 0.25-0.50 mm (0.010-0.020 in.)
Oil (Steel Rail) 0.25-1.25 mm (0.010-0.049 in.)