Stihl MS 661 Manual page 33

2
1
: Back off the spindle (1) in the
puller until it is clear of the
crankshaft stub.
: Slip the service tool (2), from set
5910 007 2222, over the collar
studs (arrows), fit the nuts and
tighten them down firmly.
: Turn the spindle (1) clockwise
until the crankshaft stub is
pushed out of the ball bearing.
– Install new ball bearings and oil
seals, b 6.6.1 and b 6.3
Ignition side of crankcase
: Remove the gasket (1).
32
Drilled plate 5910 893 2101 without
holes marked "31" can be updated
with 5.5 mm holes as shown in the
illustration.
Dimensions are in millimeters.
The illustration shows the front of
the drilled plate.
3
4
1
Use the tools in the service tool set
5910 007 2201 for removing and
installing – use drilled plate
5910 893 2101 and thrust piece
5910 893 8700.
: Unscrew the spindle (1) until the
drilled plate (2) butts against the
crankcase
– left-hand thread.
: Fit the plate (2) 5910 893 2101
against the ignition side of the
crankcase so that the number
"31" (arrow) is at the bottom.
31
31
27,6
7,9
2
3
1
31
3
: Insert two M5x72 screws (3) in
the holes marked "31" and
tighten them down until they butt
against the crankcase.
: Fit thrust piece (4) on the third
hole, insert M5 x 72 screw (3)
and tighten it down.
: Turn the spindle (1)
counterclockwise until the
crankshaft is pushed out of the
ignition side of the crankcase.
The crankshaft, connecting rod and
needle bearing form an inseparable
unit. Always replace as a complete
unit.
– Check the two halves of the
crankcase and ball bearings and
replace if necessary, b 6.6.1
– Before installing, clean the
crankshaft, b 16
Installing
Inspect and clean the sealing faces
on both halves of the crankcase
(including the cylinder sealing face)
– the sealing faces must not be
damaged in any way.
MS 661, MS 661 C-M