Husqvarna SM 50 / 2011, Workshop Manual

Page: 77 / 150

F.11
Ed. 01-09-2010
ENGINE
Operations on the left-hand crankcase half
Remove oil seals (1) and (2), and heat crankcase half onto an electric hob
up to approx. 150°C.
If, with the crankcase at a temperature of 150 °C, you tap crankcase
half on a flat wood board, bearings usually come out of their seats
spontaneously. If necessary, force bearings out of their seats.
The tools used to force new bearings into their seats shall be manu-
factured so as to lay just ono bearing outer ring nut. Failure to comply
with this requirement leads to bearing damage upon assembly.
Crankshaft ball bearing (3).
With a suitable spindle, press ball bearing from the outside to the inside.
Force the new ball bearing fully home from the inside.
Crankshaft ball bearing protrudes approx. 1 mm out of crankcase
surface.
Output shaft ball bearing (4).
With a suitable spindle, press ball bearing from the outside to the inside. Force
the new ball bearing fully home from the inside.
Output shaft ball bearing is levelled with crankcase surface.
Crankshaft oil seal (1).
Force and level the new oil seals from the outside, with the sealing lip point-
ing in.
Allow crankcase to cool down, then check that all bearings are well installed
into their seats.
Crankshaft measurement
If the crankshaft is reused, check shaft axes offset.
Shaft axes offset 0.05 mm (0.0019 in)
Connecting rod big end bearing and mating axis can be checked only
when disassembled, and this operation should thus be carried out only
in a specialised workshop.