31MS 201, MS 201 C, MS 201 T, MS 201 TC
6.2.3 Pressure Test
Carry out the same preparations as
for the vacuum test, b 6.2.2
: Push ring (1) to the right
– pressure test.
: Operate the lever (2) until the
pressure gauge (3) indicates a
pressure of 0.5 bar. If this
pressure remains constant for at
least 20 seconds, the engine is
airtight.
– If the pressure drops, the leak
must be located and the faulty
part replaced.
To find the leak, coat the suspect
area with soapy water and
pressurize the engine again.
Bubbles will appear if a leak exists.
– After finishing the test, push the
ring to the left to vent the pump –
disconnect the hose.
– Remove the flange
5910 850 4203 from the intake
manifold.
– Install the carburetor,
MS 201 b 12.4,
MS 201 T b 12.5
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– Remove the flange
5910 855 4201 and sealing
plate 0000 855 8106.
– Install the muffler, b 6.1
– Reassemble all other parts in the
reverse sequence.
6.3 Oil Seals
It is not necessary to disassemble
the engine to replace the oil seals.
Use puller 5910 890 4400 with
No. 3.1 jaws 0000 893 3706 to
remove the oil seals.
6.3.1 Ignition Side
– Remove the fan housing, b 8.2
– Remove the flywheel, b 7.5
Take care not to damage the
crankshaft stub.
– Free off the oil seal in its seat by
tapping it with a suitable tube or a
punch.
: Apply puller (1) 5910 890 4400.
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– Clamp the puller arms.
– Pull out the oil seal.
Installing
– Clean the sealing face, b 14
– Lubricate sealing lips of new oil
seal with STIHL lubricant, b 14
: Fit the installing sleeve (1)
1145 893 4600.
: Slip the oil seal (2), open side
facing the crankcase, over the
installing sleeve.
– Remove the installing sleeve (1).
2
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