Peter,
Isn't there an aluminum water pump available with a cast impeller? I
have one in my 1275, but I don't remember where I got it.
Mike MacLean
60 Sprite
56 BN2
On Wed, May 20, 2009 at 10:17 AM, Peter Caldwell <peter@nosimport.com>wrote:
> Tim,
> There are several generations of water pumps and their bearings. The
> one you "took apart" I consider the middle generation. The bearing and shaft
> are one unit and called a water pump bearing. The shaft typically has 2
> races and the outer housing has 2 races with a series of balls in each.
> These are preset angular contact bearings. They typically are "lubricated
> for life" as they are sealed at each end. There is also a groove around the
> outside of the outer race for a wire that locates the bearing into the pump
> housing. I assume you took that out, else the bearing or casting would have
> broken earlier.
> The way you took it apart is correct, so far. Now, to get the
> impeller off of the shaft! It is usually rather fragile cast iron, and is
> difficult to take off. We put the shaft of the bearing assembly, once we've
> broken the cage away as you did, into a lathe and center bore the hardened
> shaft so that we can remove the impeller without breaking it. New
> replacement shaft and bearing assemblies WERE available as WERE the original
> seals. Now, a better seal is available so that we don't have to rely on the
> cast impeller face to do the sealing, but the installation of it requires
> some machining of the pump, and impeller. The new bearing must also be
> modified to fit. But.... it can be done. Then, as Bud said, the clearance of
> the impeller to the pump body must be set properly. Takes some time and some
> tooling.
>
> The old pumps with a working grease zerk had 2 separate ball
> bearings, and some spacers and a shaft and they were more rebuildable, but
> the seal was worse.
>
> the newer alumin(i)um pumps use a similar (though not
> interchangeable) bearing, a different seal, and a crappy stamped impeller.
>
> New/modern car pumps are using plastic impellers.... hoo boy, are
> those hot sellers!
>
> I could write a book on this stuff.
>
> Peter C
> ===
> At 07:36 PM 5/19/2009, Timothy H. Collins wrote:
>
>> I opened my box of used Sprite parts and found an old cast iron water pump
>> there.
>>
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