Oil Seals - Stihl MS 441 Manual

1
: Push the ring (1) to the right.
: Actuate lever (2) until the
pressure gauge (arrow) indicates
an excess pressure of 0.5 bar.
The crankcase is airtight if this
pressure remains constant for at
least 20 seconds.
– If the pressure drops, the leak
must be located and the faulty
part replaced.
To locate the leak, coat the suspect
area with soapy water and
pressurize the crankcase again.
Bubbles will appear at the coated
area if a leak exists.
– When the test is complete, push
the pump ring to the left to vent
the system. Pull off the hose.
– Remove test flange.
– Install carburetor, b 14.3.
– Loosen muffler screws and pull
out the sealing plate.
– Retighten muffler screws.
– Reassemble all other parts in the
reverse sequence.
– Tightening torques, b 3.5.
42
8.3

Oil seals

It is not necessary to disassemble
the complete engine if only the oil
seals have to be replaced.
2
Ignition side
– Remove fan housing,
b 10.2.
– Remove flywheel, b 9.5.
Machines with handle heating
– Remove generator, b 15.7.
– Drive oil seal out of its seat with
a light tap with a suitable tube or
punch.
: Fit puller (1) 5910 890 4400
with jaws 0000 893 3706
(profile No. 3.1).
– Tension legs.
– Pull out oil seal.
The crankshaft stub must not be
damaged.
– Clean the sealing area with a little
commercially available solvent-
based degreasant not containing
any chlorinated or halogenated
hydrocarbons.
– Grease the sealing lips of the
new oil seal, b 17.
2
1
– Thinly coat the outer
circumference of the oil seal with
sealant, b 17.
– Slide oil seal over crankshaft stub
with the open side facing the
crankcase.
: Press oil seal (1) fully home with
press sleeve (2) 1122 893 2405.
1
The press surface must be plane
and free from burr.
– Turn the crankshaft through
several times after approx. one
minute.
– The cone on the crankshaft must
be free from grease, therefore
clean it with a little commercially
available solvent-based
degreasant not containing any
chlorinated or halogenated
hydrocarbons.
– Reassemble all other parts in the
reverse sequence.
MS 441, MS 441 C