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[GMCnet] Dual alternator belt pulley [message #64376] Sun, 15 November 2009 18:32 Go to previous message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
Senior Member
G’day,

To make this easier to find I created a new message.

Here’s the blurb from Gene Fishers website:

Dual Belt Alternator Pulley
I have always had problems with the alternator belts on my 80 Amp
alternators. When I replaced the last 80Amp alternator with a 100Amp unit I
decided to replace the single belt pulley (that comes with the 100 Amp
alternator) with a dual belt pulley. The pulley I found is a bolt-on
replacement made of machined steel, 2 5/8" dia., part number 1101,
manufactured by BBB Industries. It costs $7.88 and can be ordered from Kevin
at Hedahls Auto Parts in Bismark, ND. http://www.hedahls.com/
(800-472-2112). The 2 5/8" diameter pulley is small enough so that the 100
Amp alternator will generate 80+ amps at engine idle.

When I replaced the alternator I also replaced my belts with two Gates
XL-7570 (3/8" x 57-5/8") for the alternator & PS pump and one Gates XL-7619
(3/8" x 62-1/2") belt for the A/C compressor.

I only have about 3K miles on the 100 amp alternator with a dual pulley but
so far so good. Even with the alternator putting out a full 100Amps my belts
stay put and make no noise.

I would suggest replacing all of your belts with new ones. My experience is
that when you mix old and new belts, the old and new belts will be slightly
different sizes. That causes the older belts to ride deeper in the shiv and
the new belts to ride higher on the shiv. Thus the new and old belts fight
each other. Since two of my belts share all pulleys, and three belts share
pulleys at both the crank and the water pump, I replaced all of my belts
with new ones. Dave

I fitted a dual pulley on Double Trouble and that was the end of my
generator belt problems. To make sure I got the max contact with the power
steering pump I pushed it away from the block as far as its adjustment would
allow; no problems with that either.

It has been recommended that you get two belts from the same batch so that
they will be the same length and that is a good idea. I did not do that, I
fitted one new belt and left the old belt. The new belt stretched out to the
length of the old belt fairly quickly and then they stayed the same. That
was about 5000 miles ago!

Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
 


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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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