[C38] surge/overflow tank

[Charles]

Max,
I have seen several C38s without the butterfly valve you are looking 
for.  Instead, there is a 1/4" pipe plug located on top of the 
thermostat housing for the internal cooling system. 
Here is what I have done to deal with the "burp."  I removed the lower 
butterfly valve at the lower part of the engine and replaced it with a 1 
inch nipple and cap (1/4" pipe).  I now fill my coolant through the 
nipple by pumping the coolant into the system with a cheap drill pump 
that you can buy at about any hardware store.  By filling from the 
bottom-up, I do not get the the bubble as all air flows up and out the 
butterfly valve on top of the thermostat housing.  Due to the faulty 
installation of my new heat exchanger that left a hole in it... I 
probably filled the coolant system at least 10 times over the last two 
months and have not had the burp problem.

The good thing for Max is he can use the butterfly he is removing from 
the bottom of the engine on the thermostat housing.

Charles Finn
Mighty Quinn #114
Great Lakes

Max Soto wrote:
> Steve,
>  
> Exactly where is this butterfly valve located??? There is one on my 
> engine, but is close to the oil dipstick, too low to be the one that 
> you are talking about.....
>  
> Max
>
> 2009/8/25 Steve Smolinske <SSmolinske at rainierrubber.com 
> <mailto:SSmolinske at rainierrubber.com>>
>
>     Im right in the middle of rebuilding my raw water pump, replacing
>     the fresh water pump, heat exchanger and hoses also removing the
>     plumbing that was attached to my heat exchanger.  Im not an expert
>     but what I found with overheating on my boat is that it takes a
>     lot of patience to bleed the air out of the hot water tank
>     especially if the hose takes a bend down from the exchanger and
>     then up to the hot water tank.  The last time I filled my system I
>     had to fill the manifold, run the engine it would heat up to 220
>     or so I would kill the engine and wait until it burped, then top
>     off the manifold run the engine it would over heat, kill the
>     engine, burp, etc etc.  It took about an hour until I had a stream
>     of antifreeze coming out of the butterfly valve and the engine ran
>     normally.   I dont have a surge tank in my system so cant offer
>     any advice there.   The butter fly valve is at the highest point
>     in the cooling system so air will work its way through the system
>     to that point with air in the system as the engine heats up youll
>     get that lovely antifreeze steam, frothy liguid and spurts of
>     antifreeze.  You need to keep going until there is a steady flow
>     of antifreeze.   Hope that helps.
>
>     Steve
>     Peregrine #312
>     Seattle
>
>
>     ________________________________
>
>     From: listserve-bounces at catalina38.org
>     <mailto:listserve-bounces at catalina38.org> on behalf of
>     david at dlrfilms.com <mailto:david at dlrfilms.com>
>     Sent: Tue 8/25/2009 3:34 PM
>     To: Catalina 38 Listserve
>     Subject: [C38] surge/overflow tank
>
>
>
>     Still messing about with the motor. No overheat today with the
>     water tank
>     out of the loop.
>
>     Also moved the surge tank to a lower position, buzzed around the
>     lake with
>     my access port open and noticed that instead of the usual come to temp
>     then push air out until we over heat, there was a frothy flow,
>     which makes
>     me think I had the tank to high and the pressure from the tank was
>     keeping
>     the cooling system from venting properly. If nothing else the
>     observable
>     flow seems to have ruled out the spring loaded cap as a source of the
>     problem.
>
>     Having made that observation, what should the relationship between the
>     fill cap and the hot and cold lines on the surge tank be?
>
>     Thanks!
>
>
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