31MS 171, MS 181, MS 211
8.3 Oil Seals
Use oil seal (1) 9638 003 1581 if the
engine is not opened.
Install oil seal (2) 9639 003 1585 if
the engine has been opened up.
It is not necessary to disassemble
the complete engine to replace the
oil seals.
Ignition side
– Remove the fan housing, b 10.1
and b 10.2
– Remove the flywheel, b 9.5
– Free off the oil seal in its seat by
tapping it with a suitable tube or a
punch.
: Apply puller (1) 5910 890 4400
with No. 3.1 jaws 0000 893 3706.
2
217RA085 TG
1
533RA076 TG
1
– Clamp the puller arms.
– Pull out the oil seal.
Take care not to damage the
crankshaft stub.
– Cleaning the sealing face, b 16
– Lubricate sealing lips of new oil
seal with grease, b 16
– Apply thin coating of sealant,
b 16, to the outside diameter of
the oil seal.
– Slip the oil seal, closed side
facing the engine, over the
crankshaft stub.
: Use press sleeve (2)
1123 893 2400 to install the oil
seal (1).
The seating face must be flat and
free from burrs.
– Wait about one minute, then
rotate the crankshaft several
times.
– Degrease the crankshaft taper,
b 16
– Reassemble all other parts in the
reverse sequence.
533RA077 TG
1
2
Clutch side
– Remove the chain sprocket
cover, bar and chain, b 5
– Remove the clutch, b 6
– Remove the oil pump, b 13.3
: Remove and inspect the worm
(1), and replace if necessary.
: Remove the retaining ring (1).
533RA074 TG
1
533RA078 TG
1
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