Date:         Sat, 27 Sep 2014 12:11:47 -0400
Reply-To:     Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject:      Re: Coolant Pump: wear at case
Comments: To: Neil N <musomuso@GMAIL.COM>
In-Reply-To:  <CAB2RwfjE_DVpuHTNF_ZayPqc3BOFfxDJ+th_09HBNnB5SRGAsg@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

The Hepu pumps still have the dished impeller. The other aftermarkets usually do not. I have also seen the impellers walk off the shaft with no other obvious problem. Good idea to periodically remove the belt and check for smooth pump operation. There should be slight friction from the seal but generally smooth operation. The impeller rubbing on the case will be obvious. 

Dennis


-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Neil N
Sent: Friday, September 26, 2014 2:53 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Coolant Pump: wear at case

Thanks Brett. I wondered if drilling small holes or at least scuffing the surface well, would help epoxy adhesion.
I likely won't repair the surface.

WBX coolant pump images from thesamba:
http://images.thesamba.com/vw/gallery/pix/442804.jpg
http://images.thesamba.com/vw/gallery/pix/440570.jpg

@ the list: Did the OEM pump have a dish shaped impeller?
If so, I now see how the previous damage was done.
My new pump doesn't have a dish type impeller that I'm aware of.



On 9/26/14, Brett Ne <brettn777@gmail.com> wrote:
> If I were to use some kind of epoxy to rebuild the missing metal, I 
> would drill a number of shallow holes at an angle using a tiny drill 
> bit to give the epoxy a good secure bite into the base metal.  In 
> addition, I would mix in some fine glass fibers with the epoxy to help 

> keep smaller chunks from cracking  apart and flowing through the cooling system.
>
> That said, I don't think that I'd bother messing with it.  I think 
> that the only way you'd see any significant loss in cooling capacity 
> is if the gouging is continuous from the outer portion of the housing 
> to the inner portion, which would allow pressure backflow into the 
> input portion of the impeller.
>
>
>
>
> --
> Brett in Portland, OR
> "Albert" '82 VanaFox I4 Riviera
>


--
Neil n

Blog: tubaneil.blogspot.ca

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http://tinyurl.com/d7gd5ej