[C38] surge/overflow tank

[Steve Smolinske]

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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