[Alberg30] Fw: Cooling System
Brian and Elaine Timmins
timmins at optonline.net
Thu May 31 15:35:21 PDT 2001
Mike,
Long shot or not, it's a good suggestion. This appears to be a problem for
many people on the A4 list. There has been a lot of discussion about this
and alternatives.
Unfortunately, The gasket is not my problem. When I bought the new
thermostat for lots of money (several years ago) I also bought several
correct gaskets (comparatively free). I still have one or two unused new
gaskets in my stock.
I have bitten the first bullet and ordered a new thermostat housing from
Featherman. Strange as it seems to me, it turns out that featherman is the
one selling the cheaper housing now. It's just under $80.00 instead of just
over $100.00. It's made locally (to him) instead of coming from Westerbeke.
At least with Moyer/ Featherman having it made, I feel it should be up to
the task at hand.
I'll post the results after I install it. If this doesn't do it, I guess
the next step will be an acid or Marsolve Flush. I just find it hard to
believe that my engine could be clogged again.
Thanks for your help/suggestions all,
Brian #497
----- Original Message -----
From: "Mike Lehman" <sail_505 at hotmail.com>
To: <public-list at alberg30.org>
Sent: Wednesday, May 30, 2001 8:13 AM
Subject: Re: [Alberg30] Fw: Cooling System
> This is a long shot, but something that happened to me, and worth
checking.
> Once, when I replaced the impeller, I made a replacement gasket for the
> cover plate which was slightly [slightly] thicker than the "paper-thin"
> gasket than is standard. What I found was, the engine would run cool at
idle
> but under way at higher rpm, the water pump impeller would cavitate
because
> of the slightly thicker gasket. Although the pump pushed water through the
> engine, there wasn't sufficient flow to keep it cool at higher rpms. Once
I
> switched back to the original "paper-thin" gasket, my cooling problems
> dissappeared. Another important check is the wear to the inside of the
cover
> plate, if badly scored, after years of use, the pump may loose some of its
> efficiency.
>
>
> ----Original Message Follows----
> From: Brian and Elaine Timmins <timmins at optonline.net>
> Reply-To: public-list at alberg30.org
> To: public-list at alberg30.org
> Subject: Re: [Alberg30] Fw: Cooling System
> Date: Tue, 29 May 2001 22:54:12 -0400
>
> Yes, I did a complete clean out of the engine including bottle brushing
the
> passages and of course removal and clean out of the side plate access
three
> years ago. I've been maintaining it with at least two flush outs a year
> using automotive radiator cleaner and fresh water.
> I removed and replaced my impeller this year and the old one was still
in
> great shape. My thermostat is only three years old and is the correct one
> purchased through Moyer's. It was removed and cleaned and checked this
past
> winter and it appears to be fine.
> I also replaced my thru hull this year. I removed a 1/2" fitting and
> replaced it with a 1/2" fitting. The 1/2" fitting has as much of an
opening
> as the fittings going into the water pump, so that should not be a
> problem.(By the way, the hole in my hull would not have accommodated a
3/4"
> thru hull fitting without enlarging it.)
>
> I also think this sounds like a thermostat problem. Since I checked my
> thermostat over the winter and it appeared OK (and was working fine last
> season) , I'm looking for other causes. As I mentioned, my thermostat
> housing was rebuilt (by Moyer) three years ago and the replacement nipple
> for the bypass already appears thin and frail (not horribly though), I'm
> thinking along those lines. To my sense of logic, if the bypass is
allowing
> water through when the thermostat is open, I should be experiencing
> underheating not overheating.
> Any thoughts? Am I overlooking the obvious (which I do sometimes)?
> Brian A30 #497
> ----- Original Message -----
> From: "Daniel Sternglass" <dans at stmktg.com>
> To: <public-list at alberg30.org>
> Sent: Tuesday, May 29, 2001 10:10 PM
> Subject: Re: [Alberg30] Fw: Cooling System
>
>
> > Subject: Cooling System
> >
> > > Yesterday, I finally got out of my slip and motored at 1500 RPM about
> 1/2 hour
> > > to a friend's moorage. Going into his harbor, I checked the Temp.
gauge
> and
> > > found it up around (just under) 180`.
> >
> > I had a lot of cooling problems with my A-4 last year, and did what
> > sounds like similar maintenance. I assume that you removed and cleaned
> > out the cooling side plate. Also, I assume that you cleaned out the
> > channels in the block and the holes where the sideplate mates up with
> > the block, and the hols and channels in the head.
> >
> > I replaced the crossover tube on the front with Don's kit that contains
> > 2 barbed fittings and a hose. I have found that this allows me to use a
> > garden hose to flush the cooling system in both directions, e.g.
through
> > to the exhaust and back through the pump.
> >
> > A common problem that you may have overlooked is a broken off piece of
> > an old impeller in the brass pipe connected to the water pump. I found
> > this only -after- doing all the above work. The flow looked good
before,
> > but was significantly better after I cleared out the obstruction. It
> > should really shoot out a lot of water (like a hose) at maximum flow.
> >
> > However... It sounds like a thermostat problem to me. Even after all of
> > the above, the engine still ocasionally went to 180+. I was using a
> > brand new thermostat listed as OK for the A-4 in a cross-reference from
> > a local outboard shop (Quicksilver was the brand.). I eventually bought
> > 2 thermostats from Featherman's (Moyers parts guy), and like magic it
> > regulates to 130-140 all the time now...
> >
> > This year, by way of replacing the inlet through-hull, I found that the
> > previous owner had used a 1/2" PT inlet fitting under the screen, even
> > though the hole was sized for 3/4" PT. The 1/2" PT was also a
> > restriction, although it did not seem to cause any problems.
> >
> > --Dan S.
> > dans at stmktg.com
> > Watcher of the Skies, #201, 1966, Cayuga Lake, Ithaca, NY
> >
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