BMW R 1100 S, Repair Manual

Page: 79 / 311

11.32
Checking pistons and cylinders
Reference temperature for
measurements:
................................. 20
°
C (68
°
F)
•
Measure cylinder bore with internal probe at
20 mm (0.79 in) and 100 mm (3.94 in) from the
top in direction of piston pin, and again at a right
angle to the first measurement.
a
........................................... See Technical Data
Measuring plane A: ....................... 6 mm (0.236 in)
a
........................................... See Technical Data
•
Install piston rings in cylinder.
•
Measure ring gap using feeler gauge.
a
........................................... See Technical Data
Assembling pistons
•
Carefully fit piston rings to piston in the following
sequence, using piston ring pliers:
3rd groove - coiled-spring ring
2nd groove - micro-chamfer ring
1st groove - asymmetric piston ring, oval section
a
........................................... See Technical Data
L
Note:
Make sure that the gap of the spring is offset ap-
proximately 180° from the gap of the oil control ring.
Install with “TOP” uppermost.
RS110180
100
20
RS110970
A
RS110200
R21110050
1.
2.
3.