Can we discuss the practice of testing crankcase vacuum on a small OMC?

SeaKaye12

SeaKaye12

Lieutenant Junior Grade
Joined
Jul 3, 2005
Messages
1,107
Hi...

I was reading an article over on Duckworks and ran across something that I'd like to learn more about. He shows a home-made crankcase vacuum "test plate". Look at the picture.

http://www.duckworksmagazine.com/07/columns/rob/index3.htm

I'd like to know when this sort of testing would be appropriate and how to evaluate the results. I know that this is a great place to learn....so here we go :)

Thanks, Chuck



test-plate-in-use.jpg
 
H

Haffiman

Commander
Joined
Dec 17, 2009
Messages
2,454
Re: Can we discuss the practice of testing crankcase vacuum on a small OMC?

It may partly give the condition from piston rings and down, opposite the compression test that gives from rings and up. It should be about even. If not, probably a crankshaft seal is gone. There are however no given and historic values for this kind of testing.
 
clanton

clanton

Rear Admiral
Joined
Jul 9, 2001
Messages
4,876
Re: Can we discuss the practice of testing crankcase vacuum on a small OMC?

Search motorcycle 2 cycle racing engines for more info on this.
 
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