Adding belt driven alternator on an 8v71

AndyyCoulic · April 17, 2015, 09:21:29 PM

I'm looking to add a 24v alternator to my gm 4106 to charge my 24v house battery bank. The bus is 12v so i can't do anything with that.

Wondering if anyone else has added a belt driven alternator to their 8v71 and how they did it? There is a pulley but it looks fairly hard to get at.

Or if anyone knows a way to up-convert 12v to 24v. Saw there are some upconverters but only do 20amps.

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bottomacher · April 18, 2015, 05:31:01 AM

Years ago I bought a takeoff assembly for my 4106 to provide a pulley. If you're interested I will pull it down and take a photo.

OneLapper · April 18, 2015, 05:37:56 AM

The rebuilt 8V71 I bought came from the NY transit authority. Located over the oil cooler is a bracket that had, what I assume, was an alternator that ran off one of the cam pulleys. It's under the front exhaust pipe and above the oil cooler. It's a very tight spot to work in, let alone the fan, torus drive and muffler which will all be in the way.

It might be the same price to just replace the inverter with a 12 volt unit. It certainly will be easier!

Anyhow, someone may have that bracket available. It's not a stock 4106 item.

Good luck!

luvrbus · April 18, 2015, 06:37:52 AM

You have the transmission pump,power steering,air compressor and alternator on the rear there should be a place left for a accessory drive pulley at the rear below the alternator some GM's have it some don't

TomC · April 18, 2015, 08:24:25 AM

I have a V-drive also. I wanted to add an A/C compressor, but the front pulley is just about impossible to get to to build a bracket. Cliffords suggestion on using the lower rear accessory drive is the best. Only thing-might not have the drive gear inside. Good Luck, TomC

AndyyCoulic · April 18, 2015, 04:17:57 PM

Bottomacher,
I would love to see this assembly you speak of!

Thanks for the insite clifford and tom. I will also look into the other drive gears. Bus used to have a/c so maybe i can use that one.

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HB of CJ · April 18, 2015, 05:04:52 PM

Room or space would be a concern. Any way you can look and see if you have the space to consider mounting a transmission PTO driven generator? I do not know if the 730 had such. The Spicer may. Just me. HB of CJ (old coot)

RJ · April 18, 2015, 10:36:57 PM

Andy -

If your 4106 engine is stock, there should be a PTO near the torus fan drive that was used for the A/C compressor. Other '06 owners have used that PTO to mount both alternators and/or twin A6 GMC A/C compressors. A little tight, but you do have that access hatch between the rear wheel and the radiator that makes it a little easier.

FWIW & HTH. . .

AndyyCoulic · April 19, 2015, 01:16:06 AM

I will check the next time i go out to the bus! The engine is stock, but not the original engine from the bus, and the ac has been removed. But I'm hoping its there behind a block off plate.

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Bill Gerrie · April 19, 2015, 05:32:25 AM

Andy
If you are referring to the block off plate on the fan drive for the A/C and there is a plate then the drive is gone. If you have a V730 and there is a plate between the converter housing and the shift linkage I have a complete drive assembly with pulley you can have for $75 plus shipping but to install it you have to remove the transmission. The drive gear must be installed inside the transmission. The mounts are in all V730's but no gear.

AndyyCoulic · April 19, 2015, 12:11:46 PM

Dang! Its blocked off so thats a bummer. I have the 4 speed spicer, so that sadly won't work for me either.

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bevans6 · April 19, 2015, 01:14:56 PM

What drive positions are free on the back of the engine? I've seen pictures of GM's with belt drives. If you could drive it off the blower drive position that would double the speed of the pulley and make it a lot easier.

Brian

luvrbus · April 19, 2015, 01:45:01 PM

With a 4 speed manual that takes away 1 drive for the oil pump for the transmission so you are screwed on the back with the 4 accessory drives most 4106 have

TomC · April 20, 2015, 03:46:08 PM

Unless you already have the V730 PTO drive shaft sticking out, there won't be the drive gear inside. You'll have to pull the trans to install the PTO gear for the shaft. Good Luck, TomC

luvrbus · April 20, 2015, 04:01:46 PM

The AC on a 4106 drives off the Torqus fan I have the drive, the ring gear will still be there you pay the shipping and it's yours but that is a awful place for a alternator