GM water pump

Clarence L.Snyder clare.snyder.on.ca at ibm.net
Wed Oct 14 14:00:10 GMT 1998


Martin Powlette wrote:
> 
> Good point Don I did notice some wear and heat color on the ceramic seal as well
> as the mating copper like part which was all worn out.  They resemble two slip
> rings.  Is that where the sealing takes place??
> I guess the plug at the top with the 3/8 drive goes last after all the air goes
> out.
> One other thing we use coolant rather antifreeze down here and maybe, just maybe
> there is no lubrication from the coolant. Ethelyne glycol does doesn't it ??
> 
> Martin
> 
> Don.F.Broadus at ucm.com wrote:
> 
> > I have read that it is easy to crack the ceramic seal in these pump if the
> > fill isn't correct. If you have air pockets or start the vehicle before you
> > add water the seal could crack due to heat and cause your leaking problem.
> >
> >         -----Original Message-----
> >         From:   Martin Powlette [SMTP:marquise at candw.lc]
> >         Sent:   Monday, October 05, 1998 1:17 PM
> >         To:     diy_efi at efi332.eng.ohio-state.edu; toyota-mods at cyberauto.com
> >         Subject:        GM water pump
> >
> >         NON GROUP CONTENT
> >         I posted a message on a water pump problem I had been having with a
> >         small block V8 engine.  The engine had gone through about 3 pumps in
> > one
> >         9 months and now with my own experience 2 pumps in three weeks the
> > last
> >         started leaking in 2 days.  The last 2 pumps were genuine AC Delco.
> > The
> >         pump leaks through the hole in the bottom.  There was a bit of
> >         eccentricity after the first pump that I corrected with a new hub
> > and
> >         fan clutch, the fan seems balanced. I was really dissapointed in the
> >         feed back from you guys the last time so you V8 guys please chip in.
> >         The one observation I made is that the intake manifold was once
> > removed
> >         could a badly installed intake gasket be the problem??. The gasket
> >         according to Haynes Manual has a block on the rear coolant passages,
> >         what if it was removed or placed to the front passage instead???
> >         We can't always get Toyotas to work on every day. Please help.
> >
> >         Martin
Ethylene glycol logricates the seals and increases the boiling point. As
I stated before, without a proper antifreeze mixture, these pumps WILL
fail.



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