[Alberg30] Fw: Cooling System

[Brian and Elaine Timmins]

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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