[C38] Exhaust system check valve

[Phil Gay]

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 <mailto:eyriepg at comcast.net>  

To: Catalina <mailto:listserve at catalina38.org>  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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