STIHL 029, 039
36
4.8
Crankshaft
Top:
1 = Crankshaft
2 = Connecting rod
Bottom:
Oil seals
Top:
Ball bearings
Bottom:
Closed side of ball bearing
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.
-
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.
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.