Hey guys, my factory 28 year old AC belt broke today. Luckily I wasn't far from home, and only knocked off one of the other belts (I think for the PS pump).

I started taking everything apart, broke the bolt off in the alternator, took that out, had to drill and tap the hole again for another bolt.

Now I need to put it all back together, and we're having problems figuring out which belts go where?!?

Does anyone have any pictures of what belts go where?

Does anyone have any part numbers for the belts? O'Reiley's is completely lost when it comes to trying to figuring out which belt goes where.

It is a 460 and has factory AC, PS, and dual air pumps, and apparently not one of the California state emissions crap...that was one of the wrong belts that I got from O'Reiley's.

I'm stopping work on it tonight and will pick it up tomorrow.

Any help will be greatly appreciated.

Thanks

 

Well, it would help to know which engine is in the truck. . .

You pretty much have to post some photos. Even within the same engine type, there are still many differences.

 

Sorry, it's a 460.

 

 

How does this look?

 

That's great!!

The only thing it's missing is the AC compressor above the PS pump. From what I can tell, it looks like the power steering pump has 2 belts???

Do you have any other diagrams of one with the AC compressor and routing?

 

I don't know if this will help much. . .

I think that above drawing is correct except it doesn't show the AC pump. However, in the photos there is an extra sheave on the water pump pulley and, maybe, an extra sheave on the crank pulley. . . (?)

So, if I had to guess, I would say that there are two same-length belts around the two rear-most sheaves on the crank pulley, then around the two rear-most sheaves on the water pump pulley, and then around the two sheaves on the power steering pump.

Next, there is a short belt around the next sheave at the crank that goes to the alternator.

Then there would be a fairly long single belt around the most-forward crank sheave, then around the forward most sheave at the
water pump, and then to the AC compressor.

Does that sound right?

 

Yeah that sounds about right. Now the only problem is finding the correct belts that go where they belong.

 

Websites like RockAuto can be a great source of information (once you get used to how they work):

https://www.rockauto.com/catalog/rac...&parttype=8900

Belts are notorious for not seeming to fit the way you would expect. With luck, there will still be some numbers on the current belts that you can match up with RA's catalog. If not, you'll have to go with their listed part numbers as a starting point.

 

Can't seem to get that web page to work.

 

Yeah, it threw me a curve. It's fixed now.

 

Seems like the same sort of hoops I have to jump through at O'Reileys.

Once I get this sorted out, i'm going to post which belt goes where, i.e. Belt 4075 goes around the air pump and alternator, Belt 4035 goes around the AC and PS, etc etc....

 

Do you have the broken belt and the old belts? Maybe this would help;

I looked at Autozone's site, they have several alternator belts depending on what size alternator you have. Can you figure out which old belt goes where? If you can, and you can't read the numbers, just take a tape measure and measure the outside of the belt all the way around. Then look at Autozone's site. For instance;

70,100 amp alternator takes a 15345 belt. The "15" is the width in mm. The "345" is 34.5 inches long. They also list a 15465 for this same alternator. That would be a 46.5 inch belt.

40,60 amp alternator takes a 15455 belt. 15 is the width, this belt is 45.5 inches long. They also list a 15330 for this application. That would be a 33 inch belt.

I kept looking at the listings, they list all those different belts for the same application. It is a little bit ridiculous, but I think the measuring tape is going to be the only way to figure it out. If you get desperate, you can take a long belt you have laying around, cut it, and run it through all the pulleys with the adjuster all the way in, mark where it stops, measure the mark length, and get a guess as to what belt will work.

 

I have the old belts, but here's the weird part, we brought in my old alternator and tested it and it's a 55 amp. Not 70, not 100, not 40, not 60...nothing that is listed in their catalogs is what I have. Very weird.

I think the first diagram you posted will help perfectly. I just need one with the AC compressor. Do you have that one by chance?