Checking Pistons And Cylinders; Assembling Pistons - BMW R 1150 RT Repair Manual

Checking pistons and cylinders

11 25
Reference temperature for measurements:
........................................................... 20 ƒC (68 °F)
Measure cylinder bore with internal probe at
20 mm (0.7874 in) and 100 mm (3.9370 in) from the
top in direction of piston pin, and again at a right an-
gle to the first measurement (
Measuring plane A:..................... 6 mm (0.2362 in)
Piston sizes ( 11.11).
a
•
Install piston rings in cylinder.
•
Measure end gap using feeler gauge (
11 25
RS110180
L
Make sure that the gap of the coiled spring is offset
approximately 180° from the gap of the oil control
11.10). ring.
a
Install with "TOP" uppermost.
•
A
RS110970
RS110200
11.11).
a

Assembling pistons

1.
2.
3.
Note:
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
( 11.11).
a
R21110050
11.33