Dolmar PS-350 - Manual (Page 24)

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Reparaturanleitung PS-4600 / PS-5000 24 Repair manual PS-350 / PS-420
Vacuum testing
If correct carburetor setting is not possible, it will
be necessary to test the sealing of the engine.
Remove hood (see chap. 07).
Remove carburetor (see chap. 08).
To seal off the exhaust side, insert the sealing
lip 1 (chap. 00 pos. 15) between the muffler and
the cylinder. First remove the muffler and
unscrew the fastening bolt from the cylinder.
To seal off the intake side, install the sealing
plate 2 (
chap. 00 pos. 14 ) in the place of the
carburetor.
Connect the over/underpressure pump to the
connection on the sealing plate 3.
Seal off the pulse line and bring the cylinder to
top dead center.
Set up a pressure of max. 0.3 bar.
If the pressure rises within 20 seconds, the
following conditions may exist:
• Radial ring leaking
• Cylinder base gasket leaking
• Crankcase gasket leaking
• Crack in crankcase
• Crack in cylinder
• Spark plug leaking
• Rubber intake on cylinder leaking
• Defective pulse line
Note: Detergent can be used to localise leaks.
1
2
3
11 CYLINDER / PISTON