Piston, Engine

PISTON
Piston diameter (Measured at 50 mm (1.9685 inch) from outer perimeter top of piston to the pin axis.)
Coated grade 1 88.990-89.010mm (3.5035-3.5043 inch)
Coated grade 2 88.998-89.022mm (3.5039-3.5048 inch)
Coated grade 3 89.010-89.030mm (3.5043-3.5051 inch)
Uncoated grade 1 88.970-88.980mm (3.50275-3.50314 inch)
Uncoated grade 2 88.978-88.992mm (3.50306-3.50362 inch)
Uncoated grade 3 89.010-89.030mm (3.50432-3.50511 inch)
Piston to bore clearance 0.012 to 0.022mm (0.0005-0.0009 inch)
Pin bore diameter (piston) 21.008-21.012mm (0.8270-0.8272 inch)
Ring groove width
Compression (top) 1.230-1.245mm (0.0484-0.0490 inch)
Compression (bottom) 1.530-1.545mm (0.0602-0.0608 inch)
Oil ring 3.030-3.055mm (0.1192-0.0120 inch)
Piston pin
Length 60.51-60.08mm (2.382-2.365 inch)
Diameter 21.011-21.013mm (0.0013 inch)
Pin to piston clearance -0.005 to +0.001 mm (0.0001-0.00003 inch)
Pin to rod clearance
Standard 0.004-0.020mm (0.0001-0.0007 inch)
Service limit 0.035mm (0.0013 inch)
Side clearance
Compression (top) 0.040-0.075mm (0.0015-0.0029 inch)
Compression (bottom) 0.040-0.085mm (0.0015-0.0033 inch)
Oil ring Snug Fit
Service limit 0.10mm (0.0039 inch)
Compression (top)-service limit 0.50mm (0.0196 inch) Max
Compression (bottom)-service limit 0.65mm (0.0255 inch) Max
Oil ring (steel rail)-service limit 0.90mm (0.0354 inch) Max
Piston ring gap (Specification 82.4 mm (3.2441 inch) diameter gauge.)
Compression (top)-gauge diameter 0.100-0.250mm (0.0039-0.0098 inch)
Compression (bottom)-gauge diameter 0.27-0.42mm (0.0106-0.0165 inch)
Oil ring (steel rail)-gauge diameter 0.15-0.65mm (0.0059-0.0255 inch)
Compression (top)-service limit 0.50mm (0.0196 inch) Max
Compression (bottom)-service limit 0.65mm (0.0255 inch) Max
Oil ring (steel rail)-service limit 0.90mm (0.0354 inch) Max