Bar Mounting Studs; Collar Nuts For; Sprocket Cover - Stihl MS 661 Manual

: Fit the O-ring in the spur gear
recess (arrow).
– Clean all disassembled parts,
b 16
– Lubricate the threads, gears and
O-ring with STIHL grease, b 16
– Reassemble in the reverse
sequence.
5.7

Bar Mounting Studs

– Remove the side plate, b 5.2
– Use stud puller 5910 893 0501 to
unscrew collar studs from
crankcase.
1 1
: Before installing, coat the
threads (1) of the collar studs
with threadlocking adhesive,
b 16
: Use stud puller (2)
5910 890 0501 to fit and tighten
down the collar studs (1).
MS 661, MS 661 C-M
– Reassemble all other parts in the
reverse sequence.
5.8 Collar Nuts for Sprocket
Cover
Use special tool 5910 893 9601 to
replace the nuts.
– Remove the chain sprocket
cover.
: Screw the short stud
(marked "S") of special tool (1)
5910 893 9601 into the collar
nut (2) as far as stop.
2
– Turn the sprocket cover over and
clamp the special tool's hexagon
in a vise.
: Use an 11mm drill to drill away
the flange of the captive nuts –
the shoulder in the sprocket
cover must not be drilled out.
– Remove the collar nuts.
– Unscrew the special tool from the
Installing
2 1
: Push the new collar nuts (1) into
2
– Hold hexagon of collar nuts
: Screw the long stud (marked "L")
This flares the ends of the new
collar nuts and secures them in the

sprocket cover.

– Reassemble all other parts in the
collar nuts.
1
position.
steady.
of special installing tool (1)
5910 893 9601 into the collar
nuts from the other side as far as
stop.
reverse sequence.
1
1
23