Piston, Engine

Pistons and Connecting Rods
Piston Diameter @ 14.5 mm up 85.967-85.982 (3.3845-3.3851)
Piston-to-Bore Clearance 0.010-0.041 (0.0004-0.0016)
Piston Weight
Piston Height Max. 0.9 mm below deck
Piston to Bore I.D. 20.002-20.007 (0.7875-0.7877)
Ring Groove Width, Top 1.23-1.25
Ring Groove Width, Second 1.52-1.54
Ring Groove Width, Oil Control 2.52-2.54
Piston Ring Thickness, Top 1.170-1.190 (0.0461-0.0469)
Piston Ring Thickness, Second 1.471-1.490 (0.0579-0.0587)
Piston Ring Thickness, Oil Control Rail 0.43 max
Piston Ring Thickness, Oil Control Spacer 1.574-1.651
Ring-to-Groove Clearance, Top 0.04-0.08
Ring-to-Groove Clearance, Second 0.030-0.069 (0.0012-0.0027)
Ring-to-Groove Clearance, Oil Control 0.090-0.106
Ring Gap, Top 0.20-0.40 (0.008-0.016)
Ring Gap, Second 3.0.35-0.55 (0.014-0.022)
Ring Gap, Oil Rails 0.25-0.76 (0.010-0.030)
Rod Bearing Bore I.D. 52.118-52.134 (2.0519-2.0525)
Rod Bearing Shell Thickness 1.539-1.545 (0.0606-0.608)
Rod Bearing I.D. 90 degrees 49.043-49.073 (1.9308-1.9320)
Rod Bearing I.D., 45 degrees Within +0.009/-0.004 of 90 degrees
Rod Bearing-to-Crankpin Clearance 0.029-0.069 (0.0011-0.0027)
Rod Small End I.D. 20.007-20.021
Piston Pin O.D. 19.995-20.000 (0.7872-0.7874)
Piston-to-Pin Clearance 0.002-0.012 (0.0001 -0.0005)
Pin-to-Rod Clearance 0.007-0.026
Rod Side Clearance 0.070-0.370 (0.0028-0.0146)
Rod twist 0.040 max.
Rod Bend 0.021 max.
Rod Large End Micro 2.0 Ra max.
Rod Small End Micro 0.3 Ra max.
Piston Pin Endplay 0.19-1.16 (0.007-5-0.0461)