Alt. A/C belt size

[mvent]

Need to replace alternator/ air conditioner compressor dual belts on 68 GTX 440. I’ve looked on a couple of web sights and they list different sizes, they are 7/16” v belts but how can I determine length without removing first?
TIA

 

[pnora]

Is there a number on them?

 

[mvent]

Is there a number on them?

Not that I can see.

 

[pnora]

Not that I can see.

There usually is. It might be hard to see as it most likely is stamped into the belt and being all black can be hard to see. I would pull them off and inspect them closely. Most auto parts stores can measure them.

 

[69Bee]

They are also a "Matched Set" for the AC/WP belts

 

[mvent]

Is there a number on them?

Real difficult to see with my eyes but looks like 2668778 ? Does this number make sense?

 

[pnora]

Real difficult to see with my eyes but looks like 2668778 ? Does this number make sense?

Not sure on that number. I did see a 2658793 listed for 69 and 70. Your original number should be 1533532 and it shows it at 55 inches long.

 

[AR67GTX]

Very difficult (maybe impossible) to find dual matched belts. I finally bought 3 belts and selected the two that were closest in size.

 

[AR67GTX]

I went back to a 2019 thread of mine on AC belts. A 44” belt was almost too big and put my alternator adjustment out towards the end. A 42” set of belts was snug but has worked OK. This is on a 67 GTX with a 68 motor - not sure if any difference in brackets between the two years or not. I ended up with Dayco top cog belts, although not too original looking. Funny - you can’t see the cogs in this recent photo.

 

[mvent]

Thanks for all the replies, very confusing. I guess the only way to know what I have is take it off and bring it to a real parts store.

 

[qkcuda]

Here's a picture of the ones I replaced. You should be able to cross reference the numbers.

 

[pnora]

Thanks for all the replies, very confusing. I guess the only way to know what I have is take it off and bring it to a real parts store.

That most likely will be your best choice. The part number I listed is from the 68 factory parts manual. Also ask them for a matched set. They may have to order them but its the best way to do it.

 

[lemondana]

The correct number is 13651. Most places don't carry the 13 series belts anymore, they actually don't make very many of them anymore. Rock auto has Continental 13651 belts listed. 10.32 each, you have to look under the Part Number Search at the top of the page, type in 13651 for the part number and Continental for make. These won't be matched belts, but you might get lucky-and they be fairly close. PM me if you have any questions.

 

[lemondana]

Those Goodyear belts you took off are very good quality belts, better than anything you can buy today. Made in the USA. If they are not wore too bad, I would keep them and put them back on when your present belts

Here's a picture of the ones I replaced. You should be able to cross reference the numbers.

View attachment 1265551

fly apart.

 

[AR67GTX]

The Goodyear belts are not from the OP’s car.

 

[lemondana]

OK.

 

[mvent]

Removed belts today number on belt has Pentastar symbol then
2843242 2658778 42882
I measured 65.5”
Belts almost look like they could be original, real worn.

 

[mvent]

The 65.5” dimension is outside diameter of belts

 

[qkcuda]

I believe the 67 in the number on my belts is the length, or 1 1/2 inches longer than stock.

 

[mvent]

Is it reasonable to assume belts could have stretch a bit over 1/2" ? Belt recommended on Rock Auto list length at 65.1" about 1/2" shorter than my take off belts measured outside diameter.