Checking Camshaft For Wear; Removing And Installing Timing-Chain Sprockets; Checking Centrifugal Decompressor Lever; Disassembling And Assembling The Centrifugal Decompressor - BMW F 650 GS Repair Manual

•
Remove camshafts with chain sprockets.
•
Take off the lower camshaft mount.

Checking camshaft for wear

•
Measure bearing play with Plastigage type PG-1,
BMW No. 00 2 590.
•
Tighten camshaft mount to specified torque.
X
Tightening torque:
Camshaft mount........................................... 10 Nm
•
Remove camshaft mount and determine bearing
clearance using comparative scale.
Wear limits:
Cam height, inlet ..............min. 39.25 mm (1.545 in)
Cam height, exhaust ........min. 39.05 mm (1.537 in)
Bearing journal dia. ........min. 21.950 mm (0.864 in)
Bearing dia. in bearing pedestal
.....................................max. 22.040 mm (0.868 in)
Bearing play ..................max. 0.090 mm (0.0035 in)
11 31 671 Removing and installing timing-chain
sprockets
•
Clamp the camshaft in a vise fitted with protec-
tive jaws.
•
Remove the fastener securing the sprocket to
the camshaft and remove the camshaft sprocket.
•
Installation is the reverse of the removal proce-
dure: pay particular attention to the following.
•
Before installing, oil the thread of the chain-
sprocket fastener.
X
Tightening torque:
Sprocket to camshaft
(thread oiled) ................................................ 60 Nm

Checking centrifugal decompressor lever

L
Never stretch the spring, since this alters the preset
spring force.
•
00 2 590
F110040
Distance "B" .................................. 0.6 mm (0.02 in)
11 31 530 Disassembling and assembling the
centrifugal decompressor
L
If the centrifugal decompressor is dismantled,
spring (3) must always be renewed.
•
•
•
Note:
When activated, the lever must not project be-
yond the cam base circle by less than
distance "B".
2
3
1
Note:
Use a suitable punch to press shaft (1) out of
centrifugal weight (2).
Installation is the reverse of the removal proce-
dure: pay particular attention to the following.
After assembly, check centrifugal weight for ease
of movement.
B
E110090
E110100
11.25