[C38] Exhaust system check valve

[Tom T.]

Hi Phil,

Is your new check valve hung level in a "normally closed" position with the hinge at the top requiring the exhaust to open it?

Tom Troncalli


----- Original Message ----- 
From: Phil Gay 
To: Catalina 38 Listserve
Sent: 3/1/2010 11:46:21 PM 
Subject: [C38] Exhaust system check valve


Dear List,
 
I finally finished my exhaust system upgrade on my Yanmar 3GM30 from 1 5/8” to 2.”  I replaced the check valve downstream from the water lift muffler.  The flapper in the old valve was lying at the bottom of the valve unattached to anything.  I like the more relaxed sound of my exhaust now.
 
However, the new 2” check valve clanks when the engine is running.  I suspect that the bronze flapper is banging against the upper surface of the check valve rather than the surface that it closes against.  I suppose that I could put a drop of sealant on the downside surface of the flapper to deaden the noise.  Has anyone else encounter this annoying clanking?  How did you solve it?
 
Phil Gay
C38 049 Que Linda
Everett, WA
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