> I have in my possession two County (an English company, according to the
> box) water pumps, model GPA29. I also have the alternator conversion
> kit from Revington, which included a thin-belt water pump pulley. The
> problem is, when the pulley is installed on the pumps (they are
> basically identical, just from different sources), not enough of the
> thread remains on the shaft to tighten the pulley down. I can only get
> about 2 turns on the rather large nut. Seeing as this is a vital part
> of the engine, Id like to have it at least down 6 or 7 full turns, or
> preferably all the way through the nyloc ring.
>
> My first thought was locktite, but with so little thread actually in the
> nut, Im leery of going this round. My second thought was getting a
> nyloc jam nut (basically a thin nyloc, less than = of the usual nut
> height. Unfortunately, the threads on the pump dont match any threads
> that I can find it mics out to be about =-16, and the normal =
> threads are either 13 (NC) or 20 (NF). Doesnt appear to be metric, as
> 12mm doesnt fit and 14 is loose.
Your fractional symbols didn't make it through the list, as they are not
7-bit ASCII. However, since 13 tpi NC is 1/2", I'm guessing that's what you
typed. 1/2-16 is BSF.
However, the threaded portion of the shaft on my pumps is much smaller
diameter, like maybe 5/16".
> So what to do?
First of all, is the pulley seating all the way down against the front
bearing ? Some comparative measurements should show this ... if not, then
fix the problem.
Otherwise, I'd suggest contacting Neal Revington and asking him. My
inclination would be to cut the pulley to fit, but that's an awfully
expensive piece of kit, it should fit without modification !
Randall
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