[C38] surge/overflow tank

[david at dlrfilms.com]

I sure it must be terribly frustrating watching me thrash around like this!

I should have added that my engine doesn't seem to have a butterfly valve
and the only way I can see for it to bleed is out the surge tank, which it
(finally) did quite nicely once I lowered the tank position, and I did a
could of stop/cool/refill cycles.




> 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 on behalf of 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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