Stihl MS 341 Shop Manual page 37

If the vacuum reading remains
constant, or rises to no more than
0.3 bar within 20 seconds, it can be
assumed that the oil seals are in
good condition. However, if the
pressure continues to rise (reduced
vacuum in the crankcase), the oil
seals must be replaced, even if no
leaks were detected in the pressure
test.
– After finishing the test, open the
vent screw and disconnect the
hose.
– Remove the test flange.
– Install the carburetor – b 12.2.1
– Loosen the muffler screws and
remove the sealing plate.
– Tighten down the muffler screws
firmly – b 3.5
– Install the decompression valve,
if fitted – b 6.8
Reassemble all other parts in the
reverse sequence.
36
6.4 Oil Seals
It is not necessary to disassemble
the complete crankcase to replace
the oil seals.
Flywheel side
– Remove the flywheel –
b 7.1.5
– On machines with handle/
carburetor heating, remove the
generator – b 14.7
1
– 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. 6 jaws 0000 893 3711.
– Clamp the puller arms.
– Pull out the oil seal.
Take care not to damage the
crankshaft stub.
– The crankshaft sealing face and
taper must be free from grease.
Clean with standard solvent-
based degreasant containing no
chlorinated or halogenated
hydrocarbons – b 16.
– Lubricate sealing lip of oil seal
with grease – b 16.
– Slip the oil seal, open side facing
the crankcase, over the
crankshaft stub.
1
: Use the press sleeve (1)
1108 893 2405 to install the oil
seal.
The seating face must be flat and
free from burrs.
– Wait about one minute, then
rotate the crankshaft several
times.
– Install the generator (if fitted) and
tighten down the screws firmly –
b 3.5
Reassemble all other parts in the
reverse sequence.
Clutch side
– Remove the oil pump – b 11.3.1
MS 341, MS 361, MS 361 C