11.10 Technical data R 850 C R 1200 C Piston rings 1st groove Piston ring asymmetrical, convex oval Height mm (in) Wear limit mm (in) 1.170...1.190 (0.0461...0.0469) 1.1 (0.043) Gap clearance mm (in) Wear limit mm (in) 0.1...0.3 (0.004...0.012) 0.8 (0.031) Side clearance mm (in) Wear limit mm (in) 0.030...0.070 (0.0012...0.0027) 0.15 (0.0006) 2nd groove Micro-taper compression ring Height mm (in) Wear limit mm (in) 1.170...1.190 (0.0461...0.0469) 1.1 (0.043) Gap clearance mm (in) Wear limit mm (in) 0.2...0.4 (0.008...0.016) 1.0 (0.040) Side clearance mm (in) Wear limit mm (in) 0.030...0.070 (0.0012...0.0027) 0.15 (0.0006) 3rd groove Equal-chamfer ring + tubular spring Height mm (in) Wear limit mm (in) 1.970...1.990 (0.0776...0.0783) 1.9 (0.075) Gap clearance mm (in) Wear limit mm (in) 0.30...0.55 (0.012...0.022) 1.20 (0.047) Side clearance mm (in) Wear limit mm (in) 0.020...0.060 (0.0008...0.0024) 0.15 (0.0006) Installed direction of piston rings “Top” marking uppermost Piston pin Piston pin dia.
mm (in) Wear limit mm (in) 21.995...22.000 (0.8660...0.8662) 21.960 (0.8646) Bore dia. in piston mm (in) 22.005...22.011 (0.8664...0.8666) Radial clearance in piston mm (in) Wear limit mm (in) 0.005...0.016 (0.0002...0.0006) 0.070 (0.0027)