37MS 461, MS 461-R
6.6.1 Bearings / Crankcase
Each half of the crankcase can be
replaced separately if it is damaged.
Inspect and clean the sealing faces
on both halves of the crankcase
(including the cylinder sealing face)
– the sealing faces must not be
damaged in any way.
New crankcase halves are supplied
with the main parts preassembled
– see the parts list.
Parts not supplied with the new
crankcase must be transferred from
the original crankcase – check the
parts and replace if necessary.
If a new crankcase is installed, the
machine's serial number must be
stamped on it with 2.5 mm figure
stamps.
If the original crankcase is used
again, replace the oil seals and ball
bearings, remove any gasket
residue and clean the sealing
surfaces thoroughly. The sealing
faces must be in good condition and
clean to guarantee a perfect seal.
Inspect both halves of the
crankcase for cracks and all sealing
faces for signs of damage.
– See also Troubleshooting,
b 3.7
– Remove the crankshaft, b 6.6
Ignition side of crankcase
: Use a punch to carefully drive out
the oil seal.
: Check and clean the crankcase
or replace if necessary.
– If this half of the crankcase is in
order, install a new ball bearing.
– Heat area of bearing seat to
about 160°C (320°F).
The bearing drops out as soon as
this temperature is reached.
Installing
– Heat area of bearing seat to
about 160°C (320°F).
– Position the ball bearing so that
its open side (balls visible) faces
the inside of the crankcase.
: Push the ball bearing home as far
as stop.
3443RA122 TG3443RA124 TG
This operation must be carried out
quickly because the bearing
absorbs heat and begins to expand.
– Check that the bearing is properly
seated. If necessary, use
press arbor 1120 893 7200 to
press the bearing fully home.
Clutch side of crankcase
The oil seal is seated in the ball
bearing and does not need to be
removed separately.
– Check and clean the crankcase
or replace if necessary.
– If this half of the crankcase is in
order, install a new ball bearing.
– Heat area of bearing seat to
about 160°C (320°F).
The bearing with built-in oil seal
drops out as soon as this
temperature is reached.
3443RA125 TG
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