Clutch; Clutch Drum - Stihl MS 661 Manual

4.

Clutch

4.1

Clutch Drum

– Remove and install the clutch
drum, see instruction manual.
– Clean needle cage and
crankshaft stub and lubricate with
STIHL grease, b 16
!
80%
– Inspect the clutch drum (1) for
signs of wear.
If there are signs of serious wear on
the inside diameter of the clutch
drum (1), check the remaining wall
thickness. If it is less than about
80% of the original thickness, install
a new clutch drum.
– Install the clutch drum.
4.2 Clutch
– Troubleshooting, b 3
– Remove the filter cover
– Pull off the boot and unscrew the
spark plug.
– Remove the rim sprocket and
clutch drum.
18
1
: Push the locking strip (1)
0000 893 5903 into the spark
1
plug hole ("OBEN-TOP" must
face up) until it locates against
the cylinder wall (arrow)
– as shown in the illustration.
100%
1
: Apply wrench to hexagon (arrow)
and unscrew the clutch (1).
Note that the clutch has a left-hand
thread.
Disassembling
: Use hook (2) 5910 890 2800 to
remove the clutch springs (1).
1 2
If clutch is seriously worn, install
new set of 3 clutch shoes.
Assembling
– Fit the retainers and push the
clutch shoes onto the arms of the
clutch carrier.
Attach the springs at the side with
the raised hexagon.
– Use hook 5910 890 2800 to
attach the springs.
– Check the clutch – all springs
must be properly attached.
1
The cover washer (1) must be in
place and the word "TOP" (arrow)
must face outwards.
– Screw the clutch onto the
crankshaft stub so that the raised
hexagon faces outwards, tighten
it down firmly
– left-hand thread.
– Remove the locking strip from the
cylinder.
– Reassemble all other parts in the
reverse sequence.
MS 661, MS 661 C-M