BMW C1 Repair Manual page 87

Technical Data
Piston pin
Outside diameter
Wear limit
Installed clearance
Wear limit
Radial play
Wear limit
Piston-pin bore diameter
Wear limit
Piston rings
1st groove Micro-chamfer
End gap
Wear limit
Ring float
Wear limit
Ring thickness
Wear limit
Groove height
2nd groove Taper-face oil-control ring
End gap
Wear limit
Ring float
Wear limit
Ring thickness
Wear limit
Groove height
3rd groove Oil control ring
End gap
Wear limit
Ring float
Wear limit
Ring thickness
Groove height
Direction of installation
C 1
mm (in) 14.997...15.000 (0.5904...0.5906)
mm (in) 14.99 (0.5902)
mm (in) 0.04 (0,0016)
mm (in) 0.005...0.018 (0.0002...0.0007)
mm (in) 0.03 (0.0528)
mm (in) 15.003...15.008 (0.5907...0.5909)
mm (in) 15.03 (0.5917)
mm (in) 0.15...0.35 (0.0059...0.0138)
mm (in) 0.8 (0.0315)
mm (in) 1.02...1.04 (0.0402...0.0409)
mm (in) 0.1 (0.0039)
mm (in) 0.975...0.990 (0.0384...0.0390)
mm (in) 0.97 (0.038)
mm (in) 1.35 (0.053)
mm (in) 0.15...0.35 (0.0059...0.0138)
mm (in) 0.8 (0.0315)
mm (in) 1.22...1.24 (0.0480... 0,0488)
mm (in) 0.1 (0.0339)
mm (in) 1.175...1.190 (0.0463...0,0469)
mm (in) 1.17 (0.046)
mm (in) 0.4...1.4 (0.015...0.055)
mm (in) 1.5 (0.059)
mm (in) 2.01...2.03 (0.079...0.080)
mm (in) 0.5 (0.019)
mm (in) 2 (0.078)
mm (in) 2.60 (0.102)
Arrow on piston crown points toward exhaust
11.9