Dolmar PS-350 User Manual download pdf (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.

CYLINDER / PISTON

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Dolmar PS-350 User Manual Page 24