Disassembling And Assembling Cylinder Head; Removing Valves; Bore For Bucket Tappet - BMW F 650 GS Repair Manual

•
If the wear limit, distance "B", is exceeded, first
inspect the tensioner rail and the two guide rails
for score-marks and renew them if necessary.
•
If a part has to be renewed, repeat the measure-
ment procedure described above.
If the wear limit has been exceeded, the timing
chain must be renewed.
Distance "B" ........................max. 9.0 mm (0.354 in)
Disassembling and
11 12 528
assembling cylinder head
1 Valve
2 Lower valve spring plate
3 Valve stem seal
4 Valve spring
5 Upper valve spring plate
6 Valve collets

11 34 020 Removing valves

•
Use suction device, BMW No. 11 3 251, to pull
out the bucket-type tappets.
•
Check that bucket tappets and guides are in per-
fect condition.

Bore for bucket tappet

In cylinder head........... max. 33.600 mm (1.3229 in)
Radial clearance of
bucket tappet.............. max. 0.200 mm (0.0079 in)
e
Caution:
Mark the bucket tappets to ensure that they are re-
installed in their original positions (risk of jamming).
11 5 691
11 0 521
6
5
4
3
11 0 523
2
L
Note:
To simplify removal of the valve collets, tap the
valves sharply with a plastic-faced hammer.
•
Secure the cylinder head to support plate,
BMW No. 11 0 523.
1
•
Secure adapter plate, BMW No. 11 0 521, sup-
port, BMW No. 11 5 691, spindle,
BMW No. 11 5 692, nut, BMW No. 11 5 693,
and thrust plate, BMW No. 11 0 522.
E110120
•
Press down the valves with the thrust plate.
•
Use a screwdriver to press apart and remove the
valve collets.
•
Pull the valves down to remove.
11 5 692
11 0 522
E110130
11.29