Operations On The Single Parts; Operations On The Right-Hand Side Crankcase Half - Husqvarna CR 50 / 2011 Workshop Manual

OPERATIONS ON THE SINGLE PARTS

Read this section at least once before starting the following operations. Then you should define the assembly order so that
bearings are installed after crankcase halves have been heated one time only. To force bearings out or, if necessary, using a
hammer, the corresponding crankcase half shall be laid (after having removed centring bushings) onto a flat surface wide
enough so that the whole mating surface of crankcase half can well rest on it without being damaged. To this end, we recom-
mend using a wood board. Bearings and oil seals should never be installed with a hammer and, if a press is not available,
they shall be installed with the utmost care using a suitable drift. With the crankcase at a temperature of approx. 150°C, cold
bearings usually come out of their seats spontaneously. If, after cooling, bearing are well locked into their seats, replace engine
crankcase.
ENGINE
Operations on the right-hand crankcase half
Remove oil seal (1), 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.
- Centring bushings shall always be removed first to prevent any
damage to the crankcase.
- The tools used to force new bearings into their seats shall be
manufactured so as to lay just onto bearing outer ring nut. Failure
to comply with this requirement leads to bearing damage upon
assembly.
Crankshaft ball bearing (2).
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 (3).
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).
Press the new oil seal from the outside, with sealing lip pointing in.
Oil seal is positioned approx. 1 mm below crankcase surface.
Allow crankcase to cool down, then check that all bearings are well installed
into their seats.
Then check that the S lubrication hole for crankshaft ball bearing and gearbox
breather union is free.
F.10
Ed. 01-09-2010