Checking Pistons And Cylinders; Assembling Pistons - BMW R 1100 S Repair Manual

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.
............................................See Technical Data
a
Measuring plane A: .........................6 mm (0.24 in)
............................................See Technical Data
a
•
Install piston rings in cylinder.
•
Measure end gap using feeler gauge.
............................................See Technical Data
a
11.30

Assembling pistons

RS110180
•
Carefully fit piston rings to piston in the following
sequence, using piston ring pliers:
3rd groove - 3-S ring
2nd groove - micro-chamfer ring
1st groove - asymmetric piston ring, oval section
............................................See Technical Data
a
L
Note:
Make sure that the gap of the spring in the 3-S ring
is offset approximately 180° from the gaps of the oil
A
control rings.
RS110970
RS110200
TOP
1.
2.
3.
S110170