Bearings / Crankshaft - Stihl SR 430 Manual

– Hold the engine pan (1) so that
the ignition module mounting
(arrow) points in the direction of
the tapered crankshaft stub.
: Place the engine pan (1) in
position.
: Fit the screws (arrows) and
secure the engine pan in position.
– Tighten down the screws firmly in
a crosswise pattern.
– Install the spacer flange, b 9.9
– Install the muffler, b 4.1
– Install the ignition module, b 5.2
– Reassemble all other parts in the
reverse sequence.
SR 430, SR 450
4.7

Bearings / Crankshaft

1
– Remove the crankshaft, b 4.6
– Pull off the oil seals, b 4.6
: Pull the ball bearing (1) off the
tapered crankshaft stub.
: Pull the ball bearing (1) off the
straight crankshaft stub.
2
1
: The crankshaft (1), connecting
rod (2) and needle bearing form
an inseparable unit. It must
always be replaced as a
complete unit.
When fitting a replacement
crankshaft, always install new ball
bearings and oil seals.
– Clean the crankshaft before
installing the bearings, b 13
Installing
1
1
: Position the ball bearing (1),
closed side facing outwards, on
the straight crankshaft stub.
– Heat the inner bearing race to
about 150°C (300°F).
1
: Push the ball bearing onto the
straight crankshaft stub as far as
stop.
This operation must be carried out
very quickly because heat is
absorbed by the crankshaft, and the
inner bearing race shrinks.
25