Re: Alternator Pulley

[Steve Stegmann <stegmann@domain.elided>]

Jim,

I think that there are two water pump belts because that's really the one 
you can't do without.  The others are inconvenient, but the water pump 
*must* be turning.

Steve

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Steven A. Stegmann
     _/_/_/    _/      _/_/_/ "No free man shall ever be debarred the use
   _/    _/   _/_/   _/    _/  of arms.  The strongest reason for the 
   _/        _/ _/   _/        people to retain the right to keep and bear
    _/_/    _/  _/    _/_/     arms is, as a last resort, to protect 
       _/  _/_/_//       _/    themselves against tyranny in government"
 _/    _/ _/    _/ _/    _/    
 _/_/_/  _/     _/ _/_/_/         Thomas Jefferson, June 1776
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On Mon, 27 Jul 1998, Jim Gearhart wrote:

> Dan says:
> 
> > I noticed that after crawling through the woods at 5-20 MPH i 4 hi,
> >when I shut down the engine and start it up I get a LARGE recharge
> >read
> >on the ammeter. I'm thinking this is because of the low RPM of the alt
> >not putting enough charge out. BUT, I was only using the engine and the
> >radio so the AMP draw should be minimal so that is making me think that
> >the stock belt pulley is grossly over sized and at low crawl idle (thats
> >Hofs crawl speed not Theberts) the RPM at the alt is not enough to
> >actually put out a substantial charge. John L. does this sound
> >resonable? Therefore, even if we were to cut the size of our alt pulley
> >in half at our top redline I don't think we would be hurting the alt.
> >So, I'm going to look for a smaller pulley for my alt. 
> >   Here is another question, I have a two belt alt. when I add my AC air
> >compressor, does the alt stay a two belt pulley?
> 
> I just went through this pulley swap project this weekend so I thought I
> would share it with you.  I went to an alternator rebuild shop on Sat. with
> the old pulley from my Scout alt. and asked the rebuild guy for a smaller
> diameter one for my Delco 10SI alt.  He went in the back and came out
> with a perfect replacement. The outside diameter of the pulley was
> 2-5/8" verses 3-1/2" for my stock one.  It was a  heavy duty solid
> machined double pulley that the guy said came off of a Chev. Blazer alt.  
> I asked him what he wanted for it and he said nothing!  He said he had a
> bunch of them and even offered to paint it for me!  I gave him $5 anyway
> just because he was a good guy.  
> 
> I haven't installed it yet because I need to get a different 15/16" socket to
> tighten the axle nut for the pulley.  Seems the original pulley nut was
> easier to get to because the stamped pulley was flared and you could
> get a wrench on the nut.  With this machined pulley there is a "hole" that
> the nut sits in and the outside diameter of my socket is too big to fit in this
> hole to tighten the nut.  I noticed that 3/8" drive sockets are a smaller
> diameter than the same size 1/2" drive ones so tonight I'm going to buy a
> 3/8" drive 15/16" socket and see if that fits in the hole.
> 
> On my Scout the A/C compressor belt runs off of the water pump. 
> The only belts that turn the water pump are the two alt. belts.  IMHO
> running an A/C compressor appears to be the only reason Scouts use
> two alt. belts with the alternator serving as the belt tensioner for the
> water pump.  Just a personal theory anyway.
> 
> HTH,  Jim
> 
>