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Subject: TWL: RE: Exhaust overheat alarms
From: Joe Engel (joe@XXX.XXX)
Date: Thu May 02 2002 - 11:11:00 EDT
Keith - not familiar with the aqualarm mounting but here's the scenario
that happened to us. (Not on Lehman either)
The end cap blew off of the back end of the heat exchanger. The raw
water pump and of course the engine coolant pump continued to work
merrily away. There was enough flow through the heat exchanger to keep
the engine temp normal, The problem was that the raw water from the
heat exchanger was just pouring into the bilge. Without any
back-pressure there was no pressure to push enough of the raw water up
into the exhaust elbows and into the exhaust system. So those
components super-baked.
Unless I had a aqualarm connected to the link between the heat exchanger
and the exhaust manifold, I would not have received an alarm. Also I
was getting some flow up there, but not nearly enough so I don't know if
the aqualarm is an all-or-nothing alarm. IOW would a greatly reduced
flow not trigger an alarm.
Joe Engel
-----Original Message-----
From: Keith [mailto:klemmons@XXX.XXX]
Sent: Thursday, May 02, 2002 3:42 AM
To: trawlerworld list
Subject: TWL: Exhaust overheat alarms
Hmmmmm... I just installed an Aqualarm on my Lehman, which alarms me if
the cooling water flow stops for whatever reason. I would think that I
don't need the exhaust temp. alarm with this in place. If the cooling
water stops for any reason, it'll alarm, probably before the manifolds
overheat. Any flaw in this logic? I'm trying to think what might cause
the manifolds to overheat while the cooling water was still at full
flow?
-- __________________ Keith
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