[C38] Mor(on) Overheating

[PAUL NOTTE]

When I removed my raw water hose from the heat exchanger side the fresh water coolent would drain out . Tom correctly diagnosed this as a leaky heat exchanger. As long as I didn't tighten the cap the pressures were somewhat equalized and there was no coolant loss, as soon as I made a power change all the coolant went out through the exhaust . 
Hope this helps David
Paul

----- Original Message -----
From: david at dlrfilms.com
Date: Tuesday, June 21, 2011 6:08 am
Subject: [C38] Mor(on) Overheating
To: Catalina 38 Listserve <listserve at catalina38.org>

> So I found the drain plug at the lower port forward corner. Have 
> not had
> the chance to do a flush and fill from the bottom. (Still a little
> confuzelled how I'm going to fill from the bottom.)
> 
> I did take the thermostat out, and ran the engine with the 
> coolant level
> about 1 inch from topped off. I could see a steady flow of 
> coolant coming
> in from the thermostat housing to the forward inlet on the tank.
> 
> I have noticed that I was not getting any flow from the two-way 
> radiatorcap into the overflow tank, and the previous owner had 
> mentioned sometimes
> it would stop for no apparent reason.
> 
> I fiddled with the cap for a while, wondering if it was clogged 
> or jammed,
> but couldn't find anything, so I just removed the lower gasket 
> and tried
> it that way.
> 
> No luck.
> 
> Plenty of flow through the cap and out to the overflow tank, but the
> engine temp still climbed in short order, yet the coolant itself 
> was cool
> enough to stick my finger in.
> 
> Considering I could actually *see* the coolant flowing, this was quite
> frustrating.
> 
> Also, when I ran with the cap off, it seemed like their were bubbles
> coming up. It made me wonder if the system might be aspirating 
> air, and
> (re)creating a bubble.
> 
> Help?
> 
> Meanwhile, drain, flush, refill.
> 
> Argh!
> 
> 
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