25GS 461
5.2.3 Pressure test
The same preparatory steps are
required as for the vacuum test,
b 5.2.2.
: Push the hose (1) of pump
0000 850 1300 onto the
connector (arrow)
: Slide 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 soapy water and
pressurize the crankcase. Bubbles
will appear if a leak exists.
– After testing, slide the ring on the
pump to the left to vent the pump
– disconnect the hose.
– Remove flange 5910 850 4200
– Loosen screws on muffler and
pull out sealing plate
0000 855 8106
2411RA035 TG
1
3 2
– Tighten screws of muffler and fit
exhaust casing, b 5.1
– Install the carburetor, b 10.3
– Reassemble remaining parts in
reverse order
5.3 Oil seal on ignition side
It is not necessary to disassemble
the complete engine in order to
replace the oil seals.
– Remove starter, b 7.2
– Remove the flywheel, b 6.5
: Push woodruff key (1) out of the
groove
3443RA200 TG
1
Avoid damage to the crankshaft
stub.
– Free the oil seal in its seat by
tapping it with a suitable tube or a
punch.
: Apply the puller (1)
5910 890 4400 with jaws (profile
no. 3.1) 0000 893 3706
– Clamp the puller arms
– Pull out the oil seal
Installation
– Clean the mating surface, b 12
– Coat the sealing lips of the new
oil seal with STIHL grease, b 12
2411RA036 TG
1
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