Piston - Stihl SR 430 Manual

1
2
Use a firm base (2) to protect the
crankshaft.
: If it is not possible to heat the ball
bearing, apply a suitable
sleeve (1) to the inner race and
press the bearing onto the
straight crankshaft stub as far as
stop.
1
– Position the ball bearing (1),
closed side facing outwards, on
the tapered crankshaft stub.
– Heat the inner bearing race to
about 150°C (300°F).
: Push the ball bearing (1) onto the
tapered 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.
26
1
2
Use a firm base (2) to protect the
crankshaft.
: If it is not possible to heat the ball
bearing, apply a suitable
sleeve (1) to the inner race and
press the bearing onto the
tapered crankshaft stub as far as
stop.
– Lubricate the needle bearing
with oil.
– Install the piston, b 4.8
– Fit new oil seals and install the
crankshaft, b 4.6
– Install the engine, b 4.5
– Reassemble all other parts in the
reverse sequence.
4.8

Piston

– Remove the engine, b 4.5
– Remove the crankshaft, b 4.6
: Use a suitable tool to grip the
hookless snap ring at the
recess (arrow) and ease it out.
The assembly drift can be pushed
through the second snap ring, which
does not have to be removed.
1
: Apply the assembly drift (1)
1108 893 4700, small diameter
first, to the ignition side of the
piston.
SR 430, SR 450