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11 CYLINDER / PISTON
M4 x 25
Vacuum testing
If correct carburetor setting is not possible, it
will be necessary to test a leakage of the
engine.
Remove hood.
Remove the muffler. See Chap. 04.
Remove carburetor (see chap. 08).
Reparaturanleitung PS-4600 / PS-5000
Repair Manual PS-32
6
1
2
To seal the outlet side, screw on the sealing
plate 4 (Chap. 00 Pos.12) and muffler gasket
3.
To seal off the intake side, install the sealing
plate 2 (chap. 00 pos. 11) in the place of the
carburetor.
Connect the over/underpressure pump to the
connection on the sealing plate 1.
Seal off the pulse line 6 and bring the cylinder
to top dead center.
Set up an underpressure of max. 0.3 bar.
3
If the underpressure changes within 20
seconds, it may have the following causes:
4
Radial ring leaking
•
Crankcase gasket leaking
•
Crack in crankcase
•
Crack in cylinder
•
5
Spark plug leaking
•
Rubber intake on cylinder leaking
•
Defective pulse line
•
Note: The engine must be removed in order
to localize leaks.
Remove clutch. See Chap. 04.
Remove flywheel. See Chap. 07.
Remove engine. See Chap. 08.
Remove the bottom half of the crankcase
(mark position) and press the bushings out of
the engine holder.
Mount the bottom half of the crankcase to the
cylinder with bushings 5.
Always perform sealing tests with
underpressure!
If a leak is diagnosed, it can be found
using overpressure and detergent or
similar liquid.
___
25
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