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Chucks Stude
Golden Hawk Member

USA
598 Posts

Posted - 12/22/2008 :  5:22:44 PM  Show Profile  Email Poster  Reply with Quote
Have never had the opportunity, or the reason, to compare a regular versus an Avanti or heavy duty water pump. I know this is pretty basic stuff, but untill the end was broken off of my water pump did I even think about it. Here are a few side by side pics showing the differences, and why one costs more than the other. I guess as we hang heavy duty parts on our cars, such as AC, power steering, fan clutches, the strain on the parts becomes higher. Anyway, this is old hat to the veterans, but for some of the newer members, this may be enlightening.





ivorydan
Starlight Member

USA
88 Posts

Posted - 12/22/2008 :  6:40:16 PM  Show Profile  Email Poster  Reply with Quote
Hey Chuck: which is which?
Thanks! Dan
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N8N
Commander Member

USA
4472 Posts

Posted - 12/22/2008 :  6:41:51 PM  Show Profile  Email Poster  Visit N8N's Homepage  Reply with Quote
The standard pump is the one on the left, without the reinforcing ribs in the casting.

nate

--
55 Commander Starlight
https://members.cox.net/njnagel
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Tom B
Commander Member

USA
1037 Posts

Posted - 12/22/2008 :  6:49:29 PM  Show Profile  Email Poster  Visit Tom B's Homepage  Reply with Quote
Glad you posted these, I've wondered just where the difference was.

Below is a drawing (.dwg) of the critical dimensions in the un-heavy duty pump.



The 15/16 dim. (.9375) is meant to wind up .016 from the back of the cavity at that point. The impeller should be adjusted to meet this dimension. The .240 dim is unique to the un-heavy duty pump.


Tom Bredehoft
'53 Commander Coupe (since 1959)
'55 President (6H Y6) State Sedan
(Under Construction 571 hrs.)
'05 Legacy Ltd Wagon
All Indiana built cars
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Chucks Stude
Golden Hawk Member

USA
598 Posts

Posted - 12/22/2008 :  6:59:34 PM  Show Profile  Email Poster  Reply with Quote
You know, I didn't notice it, but in the last picture, notice how on the left, or std duty pump, the impeller looks to be off center. I went back and looked at the part, and it sure looks to be slightly off center. No such issue on the heavy duty pump. Better built, I guess. Both came from our vendors.
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ivorydan
Starlight Member

USA
88 Posts

Posted - 12/22/2008 :  7:01:08 PM  Show Profile  Email Poster  Reply with Quote
OK, what I'm tryig to figure out is which one is correct for a Hawk with an R1 engine? I seem to remember someone telling me I could not use the Avanti pump on an R1 Hawk!If not, why not? Thnks.
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N8N
Commander Member

USA
4472 Posts

Posted - 12/22/2008 :  7:19:50 PM  Show Profile  Email Poster  Visit N8N's Homepage  Reply with Quote
I thought that the larger nose wouldn;t fit into the viscous drive. I'd be happy to be proved wrong though.

nate

--
55 Commander Starlight
https://members.cox.net/njnagel
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Chucks Stude
Golden Hawk Member

USA
598 Posts

Posted - 12/22/2008 :  9:08:44 PM  Show Profile  Email Poster  Reply with Quote
I have just bench assembled the water pump, double pulley, spacer, viscous drive and 6 blade fan. Pics


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jimmijim8
Regal Member

USA
374 Posts

Posted - 12/23/2008 :  06:57:04 AM  Show Profile  Email Poster  Reply with Quote
I used an avanti pump on my fan clutch/ac equipped 63 Hawk 289 non R engine. I had to make a spacer for in between where the fan clutch meets the pulleys. My car didn't come with a spacer as pictured in this post. Thickness was if I remember correctly 3/16".This was to keep the pump flange from bottoming out in the fan clutch pilot hole.
Let me know if this explanation is clear. As far as I am concerned, a heavy duty pump is needed for the x-tra weight of the clutch. I feel that the pump will last longer. jimmijim






"

Edited by - jimmijim8 on 12/23/2008 06:59:16 AM
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