Installing The 11. Crankshaft - Stihl MS 650 Manual

6.7.2 Installing the Crankshaft
New crankcases are supplied with
preassembled ball bearings and oil
seals.
It is necessary to stamp the
machine's serial number on the
crankcase with 2.5 mm figure
stamps.
If only the ball bearings have to be
replaced, make sure the annular
buffers, suction hose and oil tank
cap are removed before the
crankcase is heated.
If the original crankcase is used
again, remove all gasket residue
and clean the mating surfaces
thoroughly to guarantee a perfect
seal.
If a new crankcase is installed, the
following additional operations are
necessary:
: Dowel pins (arrows) must be in
position. If necessary, drive them
into the flywheel half of the
crankcase.
MS 650, MS 660
– Heat the area of the ball bearing
seat on the flywheel side of the
crankcase to about 120 °C
(250 °F).
Wear suitable gloves to protect
your hands from burn injuries.
: Push the ball bearing, open side
(balls visible) facing the
crankcase, into the crankcase by
hand, from the inside outwards
as far as stop.
This operation must be carried out
very quickly because the bearing
absorbs heat immediately and
begins to expand.
1
: If it is not possible to heat the
flywheel side of the crankcase,
use press arbor (1)
1124 893 7200 to press home
the ball bearing as far as stop.
2
– Wait for crankcase to cool down.
: Fit nipple of tank cap cord (1) in
the slot (2) and pull it forwards.
1
2
: Push the annular buffer home so
that its annular groove (1)
engages the housing rib (2).
1
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