Installing Piston - BMW F 650 GS Repair Manual

Installing piston

11 25 050
•
Coat the small end bore and the piston pin bore
in the piston with Optimoly MP 3.
e
Caution:
Note the mark on the exhaust side of the crown ap-
plied on disassembly.
•
Install the piston.
•
Press the piston pin in with drift,
BMW No. 11 6 581.
2
1
3
•
Install piston pin circlip with mandrel,
BMW No. 11 6 581, and adapter,
BMW No. 11 6 583.
Assembly sequence:
•
Place piston pin circlip (2) flat on bench.
•
Place sleeve (1) over the single-hook circlip (2)
so that the ring gap is opposite the flat on the
sleeve and the hook is in the groove.
•
Press the circlip into the sleeve.
•
Using the domed side of assembly drift (3), push
the circlip in as far as possible.
•
Turn the assembly drift round and push in the cir-
clip until seated in the groove.
11 6 581
•
Position sleeve, BMW No. 11 6 583, with instal-
lation arbor, BMW No. 11 6 581, against piston.
e
Caution:
Support side of piston.
•
Press piston pin circlip into piston with firm pres-
sure.
F110740
11 6 583
E110390
11.51