Date:         Sat, 6 Jul 2002 09:25:03 -0400
Reply-To:     Ben huot <huotx@VIDEOTRON.CA>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Ben huot <huotx@VIDEOTRON.CA>
Subject:      Re: continuing almost overheating problem.

A last post before I go (in 15 minutes!!!!!!!)

Somebody!!!!! on the list just p-mail me about the pump mating surface, i
think it's a very interesting debate as many are having flow or cooling
problem so I decided to post here (not to brag kent or anything like that
but just to clarify this very important subject, this is not a "who is
right or wrong" but was is good or bad.

That somebody wrote:
>>>The mating surface of the engine has nothing to do with impeller
operation. Study it closely the next time you have one exposed. Operation
clearance is between the impeller and the pump body.<<<


Well! i am leaving for Vacation this morning, so I don't have much time too
debate this interesting subject.
I don't wan a say who is wrong and who is right but I think that the
special mating surface shape of the pump as much to do with the pump
operating properly. We all know that when the bearing fail slowly the
impeller will start touching the mating surface (engine side) and on a long
term could damage this one (pitting). I some way you are maybe right, the
mating surface of the impeller (pump side) is flat with no hole!!! So it
doesn't do much but if a considerable gap if form between the 2, it could
considerably diminish the pump capacity and coolant could be wrongly
redirected, what I think that less or more coolant could be going to the
right head or left head, and the result would be an uneven flow to each
side!
My Hepu pump came with a small instruction including some specs and
measurements check /verification. One is too check the flat surface (mating
surface side of the pump) with a flat metal plate and verify the tolerance
between the pump body contour and the impeller (flat wise!!!). Why? So if
the impeller / pump body (view sideway) minimum tolerance are crucial it as
much to do with the engine mating surface of the pump also.

Well anyway, this is a very interesting / important subject as many are
having overheating problem and coolant flow problem.

Have a good month of July, I am out!!!!!!!!!!!! (Just for a few weeks!!!)
;-)

Cheers, Ben

Ps.: captain Ben was there until the last moment... (he he he)