Operation Manual

46 MS 241 C
– For versions with quick chain
tensioner, fit side plate
: Coat screw (1) with Loctite,
screw in and tighten, b 16
: Fit the circlip (1)
– Examine and install the piston,
b 6.7
– Examine and install the cylinder,
b 6.5
– Install chain tensioner, b 5.7
– Reassemble remaining parts in
reverse order
2410RA545 TG
1
2410RA123 TG
1
6.6.1 Ball bearing / crankcase
The two halves of the crankcase
can be replaced individually if they
are defective.
New crankcases are delivered with
the relevant components pre-
assembled
– see spare parts list
Those parts which are not supplied
with the new crankcase must be
removed from the old crankcase,
examined and replaced if
necessary.
When fitting a new crankcase, the
machine's serial number must be
stamped on the crankcase with
2.5 mm figure stamps.
If the original crankcase is reused,
the oil seals and grooved ball
bearings must be replaced, all
gasket residues removed and the
mating surfaces cleaned
thoroughly. The mating surfaces
must be absolutely flawless and
clean to guarantee a perfect seal,
b 16.
Examine both halves of the
crankcase for cracks and check all
mating surfaces for signs of
damage.
– Refer also to troubleshooting,
b 3.7
– Remove crankshaft, b 6.6
– Wear protective gloves
– risk of burns
Ignition-side half of the
crankcase
: Carefully drive the oil seal out
with a punch
: Examine and clean the
crankcase, replace if necessary.
– Replace ball bearings if the
crankcase is in good condition
– Heat the bearing seat of the ball
bearing to approx. 150 °C
(300 °F)
The bearing (1) drops out of its own
accord when this temperature is
reached.
2410RA124 TG2410RA125 TG
1