BMW R 1100 RT Repair Manual page 70

Technical Data
Piston pin bore dia.
Weight classes
Weight difference in one class
Direction of installation
Piston rings
1st groove Micro-taper compression ring
Height
Wear limit
Gap clearance
Wear limit
Side clearance
Wear limit
2nd groove Micro-taper compression ring
Height
Wear limit
Gap clearance
Wear limit
Side clearance
Wear limit
3rd groove Equal-chamfer ring + tubular spring
Height
Wear limit
Gap clearance
Wear limit
Side clearance
Wear limit
Installed direction of piston rings
Piston pin
Piston pin dia.
Wear limit
Bore dia. in piston
Radial clearance in piston
Wear limit
11.20
mm (in)
g (oz.)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
R 1100 RT
22.005...22.011
(0.86634...0.866575)
+ and —
10 (0.35) (complete with
pins and rings)
Arrow on piston crown
pointing to exhaust side
Production locating
towards exhaust side
(see Installing piston)
a
1.175...1.190
(0.04626...0.04685)
1.1 (0.043307)
0.1...0.3
(0.003937...0.0118)
0.8 (0.031496)
0.040...0.075
(0.001575...0.002953)
0.15 (0.00591)
1.175...1.190
(0.04626...0.04685)
1.1 (0.043307)
0.1...0.3
(0.003937...0.0118)
0.8 (0.031496)
0.030...0.065
(0.00118...0.002559)
0.15 (0.00591)
2.475...2.490
(0.09744...0.09803)
2.4 (0.094488)
0.30...0.60
(0.011811...0.023622)
1.20 (0.047244)
0.020...0.055
(0.000787...0.002165)
0.15 (0.00591)
"Top" marking
uppermost
21.995...22.000
(0.86594...0.86614)
21.960 (0.864567)
22.005...22.011
(0.866339...0.8665748)
0.005...0.016
(0.000197...0.0006299)
0.070 (0.0027559)