Hi Charley,
The theory is that the new carbon face seal in the pump may need to be
bedded in for a completely leakproof seal. If the seal is run in coolant
which acts as a lubricant, it may not bed in. Some pump rebuilders dry
run the pump before shipping. Some don't.
All you need to do is spin the pump while dry for a couple of minutes.
If there is a hub on the pump you can hold the hub against a wire wheel
buffer to rotate the hub. Similarly, you could spin the shaft with a
drill press or drill motor. Ten minutes on a lathe would certainly work,
but it's not really necessary.
Charlie wrote:
> Getting ready to install a new water pump on my 63 BJ7. Was told I
> should "run it in" for ten minutes on a lathe before installing in
> the vehicle or it may leak. Any ideas on that theory from the more
> experienced folks out there? Thanks in advance.
>
> Charlie Carpenter
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