Roller Bearings; Crankcase - Stihl MS 201 Manual

6.5.1

Roller Bearings /

Crankcase

Each half of the crankcase can be
replaced separately if it is damaged.
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
roller bearings, remove any gasket
residue and clean the sealing
surfaces thoroughly. The sealing
faces must be 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
– Separate the two halves of the
crankcase, b 6.5.
– Wear protective gloves to reduce
risk of burn injury.
As the crankcase halves have to be
heated to remove and install the
roller bearings, all heat-sensitive
parts have to be removed.
MS 201, MS 201 C, MS 201 T, MS 201 TC
Ignition side of crankcase
1
: Open the oil tank cap (1),
disconnect it and put it to one
side.
: Use a suitable punch to carefully
drive out the oil seal.
: Check and clean the crankcase
or replace if necessary, b 14
If this half of the crankcase is in
order, install a new roller bearing.
1
– Heat area of bearing seat to
approx. 160 °C (320 °F).
The roller bearing (1) drops out as
soon as this temperature is
reached.
1
– Heat area of bearing seat to
approx. 160 °C (320 °F).
– Position the roller bearing so that
the nylon ring faces outwards.
: Press the roller bearing (1) fully
home.
This operation must be carried out
quickly because the bearing
absorbs heat and begins to expand.
37