BMW R 1100 S, Repair Manual

Page: 101 / 311

11.54
Installing piston
•
Turn oil scraper ring so that gap (arrow) is at top.
•
Install piston rings with gaps offset by 120°.
Production locating point X = install on exhaust side.
e
Caution:
Make sure that retaining rings are properly seated
on piston pin.
Oil the friction faces.
Always use pistons of the same weight class in any
one engine.
Markings: .................................................... + or —
a
........................................... See Technical Data
e
Caution:
Always install pistons and cylinders in pairs.
Do not mix up pistons and piston pins.
Piston size identification:
On piston crown A, B, AB (for either A or B cylinder),
and on cylinder A, B.
R21110060
X