Belt part numbers

Rupert8 · Jul 7, 2024

Hi all,

I just know it's here on the forum somewhere but I can't find it - does anyone have the part numbers for the four V-belts on a 1986 6.9 F250?

Just had the air conditioning belt snap (about a week after checking them, so good work eagle eyes there...) so figure I should replace them all.

This would be: vacuum pump, alternator, air conditioning compressor and power steering pump.

Looks like the power steering is Motorcraft JC 604L - but wouldn't mind confirming.

Thanks for the help. I can't read the numbers on the existing belts and my owner's guide is missing so many pages now I can't find it there either. Looked on Autozone and O'Reilly etc and they show so many belts all of which are different lengths and all of which say 'will fit your vehicle'. Hmmm.

Is there a reliable manufacturer cross-reference online anywhere?

Much appreciated.

Kdo58 · Jul 7, 2024

O'reilly's carries them, ac has three different sizes.

Cubey · Jul 7, 2024

The Alternator and power steering (at least with Saginaw on vans) is the same exact belt.

AC is a different belt.

I only run and recommend Gates Fleetrunner. They're very expensive retail but good priced online.

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Rupert8 · Jul 7, 2024

Cubey said:
The Alternator and power steering (at least with Saginaw on vans) is the same exact belt.

AC is a different belt.

I only run and recommend Gates Fleetrunner. They're very expensive retail but good priced online.

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Thanks so much. I'm willing the pay a little extra for reliability.

Sorry to ask, but do you have the vacuum pump belt number? Tried going from the numbers above and got nowhere.

Cubey · Jul 7, 2024

Rupert8 said:
Thanks so much. I'm willing the pay a little extra for reliability.

Sorry to ask, but do you have the vacuum pump belt number? Tried going from the numbers above and got nowhere.

I put this. Not fleet runner but it's not under as much load, and that's the easiest belt to replace.

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Rupert8 · Jul 9, 2024

Thanks as always, all.

Digging around online I did find this, if it helps anyone else out in the future: https://www.garysgaragemahal.com/drive-belts.html

Cubey · Jul 9, 2024

Rupert8 said:
Thanks as always, all.

Digging around online I did find this, if it helps anyone else out in the future: https://www.garysgaragemahal.com/drive-belts.html

RockAuto too, for part numbers in general.

Rupert8 · Jul 14, 2024

Hi again,

I got the belts installed, not too bad a job. But one issue has popped up.....:

I installed the Gates 9580 Fleetrunner between the fan and alternator. All good.

I installed a Gates 7330 XL between the alternator and vacuum pump but when I get the alternator-fan belt nice and tight the 7330 is very loose. If I try I can make it slip around the alternator-side pulley by hand. It runs the vacuum pump without squealing but it's flapping all over the place. I have the alternator-fan belt tightened very tightly but the 7330 is still loose.

I tried a smaller belt - a Dayco 15325 - on the alternator-vacuum pump. This belt is so tight it will barely go over both pulleys. And when it does it is so tight that it doesn't give me enough movement to tighten the alternator-fan belt, so that one is loose.... (I also tried a Duralast 15325 in case it made a difference - no luck.)

Seems like it's a choice between loose alternator-vacuum pump belt or loose alternator-fan belt right now.

So my questions are:
*Am I installing the wrong belts either on the alternator-fan or alternator-vacuum pump?
*Is there a belt sized in between the 15325 and the 7330 that I've missed?
*Will running these v-belts for a while cause them to snug up?
*Is there just a trick here that I'm missing?

Thanks as always!

Rupert8 · Jul 14, 2024

Cubey said:
RockAuto too, for part numbers in general.

Oh, and that's my first time checking out Rock Auto. Great resource, and store. Thanks.

Cubey · Jul 15, 2024

Rupert8 said:
Hi again,

I got the belts installed, not too bad a job. But one issue has popped up.....:

I installed the Gates 9580 Fleetrunner between the fan and alternator. All good.

I installed a Gates 7330 XL between the alternator and vacuum pump but when I get the alternator-fan belt nice and tight the 7330 is very loose. If I try I can make it slip around the alternator-side pulley by hand. It runs the vacuum pump without squealing but it's flapping all over the place. I have the alternator-fan belt tightened very tightly but the 7330 is still loose.

I tried a smaller belt - a Dayco 15325 - on the alternator-vacuum pump. This belt is so tight it will barely go over both pulleys. And when it does it is so tight that it doesn't give me enough movement to tighten the alternator-fan belt, so that one is loose.... (I also tried a Duralast 15325 in case it made a difference - no luck.)

Seems like it's a choice between loose alternator-vacuum pump belt or loose alternator-fan belt right now.

So my questions are:
*Am I installing the wrong belts either on the alternator-fan or alternator-vacuum pump?
*Is there a belt sized in between the 15325 and the 7330 that I've missed?
*Will running these v-belts for a while cause them to snug up?
*Is there just a trick here that I'm missing?

Thanks as always!

Tension the main alternator belt first, then install and tension the vacuum pump belt.

The vacuum pump bracket has a square hole for a socket wrench (3/8" i think) to tension it. Loosen the two bolts (10mm i think) for the vac pump bracket and you can easily slip on the belt. Use a socket wrench to tension with one hand and another socket wrench or wrench to tighten the bolts on the bracket.

In other words, the vac pump has it's own pivot, and tensions separately from the alternator. You don't tension the vac pump belt with the alternator.

V belts can get looser as they wear/stretch, unlike serpentine that has an automatic tensioner that takes up any slack.

Rupert8 · Jul 15, 2024

Cubey said:
Tension the main alternator belt first, then install and tension the vacuum pump belt.

The vacuum pump bracket has a square hole for a socket wrench (3/8" i think) to tension it. Loosen the two bolts (10mm i think) for the vac pump bracket and you can easily slip on the belt. Use a socket wrench to tension with one hand and another socket wrench or wrench to tighten the bolts on the bracket.

In other words, the vac pump has it's own pivot, and tensions separately from the alternator. You don't tension the vac pump belt with the alternator.

V belts can get looser as they wear/stretch, unlike serpentine that has an automatic tensioner that takes up any slack.

Ugh, how did I miss that......? Belt on. Five minutes. Thanks once again.

Rupert8 · Jul 16, 2024

So a couple questions....

1) That fan-alternator belt sure does flap around some (and I'm sure it is sufficiently tensioned). Does anyone else have this experience? Really don't feel comfortable tightening it more, but that's a long stretch and it moves a lot.

2) I have the fan-power-steering belt tensioned as much as the set-up allows. (In other words, the power steering pump is raised as much as it will go.) But the belt is the loosest of the lot. It's working OK as it is, but won't a new belt stretch as it gets broken in, causing it to be too loose?

Overthinking this? Maybe. But learning via this forum is golden and I like to get things as reliable/right as I can for peace of mind.....

Thanks!

Cubey · Jul 16, 2024

Rupert8 said:
So a couple questions....

1) That fan-alternator belt sure does flap around some (and I'm sure it is sufficiently tensioned). Does anyone else have this experience? Really don't feel comfortable tightening it more, but that's a long stretch and it moves a lot.

2) I have the fan-power-steering belt tensioned as much as the set-up allows. (In other words, the power steering pump is raised as much as it will go.) But the belt is the loosest of the lot. It's working OK as it is, but won't a new belt stretch as it gets broken in, causing it to be too loose?

Overthinking this? Maybe. But learning via this forum is golden and I like to get things as reliable/right as I can for peace of mind.....

Thanks!

V belts are just crappy about having to tension.

Try retensioning the power steering belt. It has a 3/8" hole in the bracket too to help with it.

Alternator tends to be floppy on the longest run between the water pump and alternator. if it's not squealing, it's probably ok. mine was a bit loose a few months ago and it squealed at lower RPM. tightened it up again and it's been good since. i use a big harbor freight tire iron.

Rupert8 · Jul 17, 2024

Thanks again, Cubey, good to know on the alternator belt. Yes, that's exactly where it's moving a lot, kind of wish I had benchmarked by checking the old belt before I removed it. I'll just keep an eye on it.

Thing is, I can't tension the power steering belt any further - the pump is at its maximum point and won't go any further. (I used a socket wrench earlier today to see if I could persuade it to move a little more, with no luck.) That's my concern as the belt wears in some - I have no means of tensioning it any more. Hmm. I installed a Gates 9600HD Fleet runner since that is what Rock Auto's page suggested after your initial post recommended the Fleet runners, but am wondering if I should use a slightly shorter belt. I now see you specifically suggested the 9580 HD (same as the alternator belt), I missed that. Did you scrawl over the 9600 for this reason....?

Cubey · Jul 17, 2024

Rupert8 said:
Did you scrawl over the 9600 for this reason....?

I scribbled over another 9580 in another brand.

9600 doesn't come up at all for my Econoline application, which is what I was going by:

1989 FORD E-350 7.3L 445cid V8 DIESEL Belt | RockAuto

RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.

www.rockauto.com

Do you have a Ford power steering pump or Saginaw? 9580 being for both is based on that, hence I said:

Cubey said:
The Alternator and power steering (at least with Saginaw on vans) is the same exact belt.

The blue "info" button on RockAuto products often give you this type of details.

9580 is about 2 inches less longer than 9600, according to the info on RockAuto:

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Belt part numbers

Rupert8

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Kdo58

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Cubey

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Cubey

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Cubey

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1989 FORD E-350 7.3L 445cid V8 DIESEL Belt | RockAuto

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