Crankshaft - Stihl 029, 039 Service Manual

STIHL 029, 039
4.8

Crankshaft

Top:
1 = Crankshaft
2 = Connecting rod
Bottom:
Oil seals
The crankshaft, connecting rod and
needle bearing are an inseparable
assembly. This means that the
crankshaft must always be replaced
as a complete unit in the event of
damage to any one of these parts.
When fitting a replacement crank-
shaft, always install new ball
bearings and oil seals.
Top:
Ball bearings
Bottom:
Closed side of ball bearing
- Remove the piston - see 4.6.
- Pull both oil seals off the crank-
shaft stubs.
- Pull both ball bearings off the
crankshaft stubs.
- Note that closed side of ball
bearings must face outward
when they are installed. Heat
new ball bearings to approx.
50°C (120°F) and push them on
to the crankshaft stubs as far as
stop.
1 = Sealing lip
2 = Clamping ring
- Pack space between sealing and
dust lips of oil seals with grease -
see 12.2.
- Apply thin coating of sealant, -
see 12.2, to outside diameters of oil
seals.
- Slide oil seals on to crankshaft
stubs so that the clamping ring
points outward (sealing lip also
points outward).
Assembly of other parts is a
reversal of the disassembly
sequence.
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