28 MS 461, MS 461-R
6.2.3 Pressure Test
Carry out the same preparations as
for the vacuum test, b 6.2.2
: Connect hose of pump
0000 850 1300 to the nipple
(arrow).
: 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 crankcase
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 oil and pressurize the
crankcase 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 4200.
– Loosen the muffler screws and
remove the sealing plate
0000 855 8106.
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3 2
– Tighten down muffler screws
firmly and fit the top casing,
b 6.1
– Install the carburetor, b 12.4
– 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.
Ignition Side
– Remove the rewind starter,
b 8.2
– Remove the flywheel, b 7.5
– On machines with heating,
remove the generator and put it
to one side, b 13.7
: Remove the key (1) from the
crankshaft stub.
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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
with No. 3.1 jaws 0000 893 3706.
– Clamp the puller arms.
– Pull out the oil seal.
Installing
– Clean the sealing face, b 15
– Lubricate sealing lips of new oil
seal with STIHL grease, b 15
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