[C38] Exhaust system check valve

[avantura at comcast.net]

As Max said, "What check valve?" 



Russ Duff 

#112 

Avantura 




----- Original Message ----- 
From: "Phil Gay" <eyriepg at comcast.net> 
To: tdtron at earthlink.net, "Catalina 38 Listserve" <listserve at catalina38.org> 
Sent: Tuesday, March 2, 2010 12:06:17 PM GMT -05:00 US/Canada Eastern 
Subject: Re: [C38] Exhaust system check valve 




Yes, Tom, it is mounted level with the valve flapper hinged at the top and closed when no exhaust is going through. 



Max and Steve, I installed a 2” check valve to replace the existing 1 5/8” check valve.  As I mentioned before, the old check valve wasn’t functional.  I think the purpose of the check valve is to prevent waves from behind from surging up the exhaust and entering the exhaust manifold.  Mine was probably a carryover from the exhaust system from the original Universal engine. 



Phil Gay 

C38 049 Que Linda 

Everett, WA 





From: listserve-bounces at catalina38.org [mailto:listserve-bounces at catalina38.org] On Behalf Of Tom T. 
Sent: Tuesday, March 02, 2010 6:06 AM 
To: Catalina 38 Listserve 
Subject: Re: [C38] Exhaust system check valve 





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 
_______________________________________________ Listserve mailing list Listserve at catalina38.org http://catalina38.org/mailman/listinfo/listserve_catalina38.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://catalina38.org/pipermail/listserve_catalina38.org/attachments/20100302/a78755d9/attachment-0001.htm>