Stihl MS 311 Manual page 31

6.3 Oil Seals
2
1
Use oil seal (1) 9638 003 1581 for
replacement on closed engine.
Use oil seal (2) 9639 003 1585 for
replacement on opened engine.
It is not necessary to disassemble
the engine to replace the oil seals.
Ignition side
– Remove the fan housing, b 8.2
– Remove the flywheel, b 7.6
1
– Free off the oil seal in its seat by
tapping it with a suitable tube or a
punch.
30
: Apply puller (1) 5910 890 4400
with No. 3.1 jaws 0000 893 3706.
– Clamp the puller arms.
– Pull out the oil seal.
Take care not to damage the
crankshaft stub.
– Clean the sealing face, b 14
– Lubricate sealing lips of new oil
seal with grease, b 14
Installing
1
2
– Slip the oil seal, open side (snap
ring) facing outwards, over the
crankshaft stub.
: Use press sleeve (2)
1122 893 2405 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 14
– Reassemble all other parts in the
reverse sequence.
Clutch side
– Remove the clutch, b 4
– Remove the oil pump, b 11.3
1
: Remove the E-clip (1).
MS 311, MS 391