I have done a rebuild sinds a +-200 km ago and today i took the car to go for a ride and when i came home i smelled a little bitt of rubber
so i open the hood and see pieces of my belt hanging over the engine

http://i160.photobucket.com/albums/t...3/Image030.jpg

and then i saw the belt ...

http://i160.photobucket.com/albums/t...3/Image031.jpg
http://i160.photobucket.com/albums/t...3/Image029.jpg

Are there more person who had this problem ??? don't know what the problem could be

 

Maybe the belt was old

 

warped pulley?

 

Rubber smell may mean that something (air pump, for example) is binding and causing the belt to slip. Check that everything moves as it should.

The next thing I would check is to make sure the pulleys are correctly aligned with each other. If one is too far forward or back, or at an angle to the others (something mounted wrong after the rebuild?) it can cause this (the belt can climb off the side of a pulley if they are not aligned, causing the belt to shred just like yours). Also make sure the belt is not rubbing on anything.

Alos, looking at the pictures of your belt it looks like the side that ripped is the front edge, which is already at the edge of the pulley. Was the belt installed correctly (all grooves properly engaged with EVERY pulley)?

 

it could be it was old but if i look to the aligment then it looks like the one from PS is more to the back then the one on the left from the PS
also looks like the Mail pulley (double one) is more to the front.
i don't know what i could do to check for sure about the aligment the tension was good so it wasn't slipping too

about the installation about the belt i don't know if that was good i didn't do it myself. The person who did my rebuild also said that it could be that the belt was old but it looked good before the rebuild and now it looks VERY old .

 

if a pulley is stuck, it can cause this..make sure that all pulleys can turn easily,
the tensioners aswell

 

Get a new belt make sure it's on all the pulleys correctly, with correct tension on the idler. after setting the tension make sure you lock down the adjusting nut and then crank it up and make sure everything is tracking correctly. From the looks of it the belt may not have been correctly installed and walked a couple of ribs without being noticed then eventually wore through just shedding the two ribs it moved off the pulley. Just a guess as I've seen this happen when the belt shifts on the main crank pulley, it then aligns itself and shifts on the other pulleys but isn't noticed. Not a big deal and what's left on the pulley will surely run the accessories till you get the new one as long as it looks to be tracking correctly now.

 

This may not be the problem, but your tensioner pulley is backwards.

 

^ Eggie, I think that *is* the problem. IIRC, it isn't symmetrical and the belt will be misaligned and rub on the lip if the pulley is backwards.

 

i had the same problem before and didnt have a tensioner pulley.

 

Mine did this when the air pump went out. It was causing the belt to slip due to the fact that the air pump pulley would not turn.

 

The tensioner pulley is put on backwards, the rib on the front should be in the rear.

 

turbo jeff. Are you talking about the pulley that is to the left of the power steering pulley when facing the engine bay from the front? To clarify, the shiny one with one flange?

If so, then no, that pulley is not on backwards. Unless Mazda installed mine wrong from factory.

 

Facing the front of the car the tensioner pulley is on the left with the flange.

Did you buy your car new and photo document the tensioner pulley?

I've had 21 FDs and put engines in many other FDs. The pulley is on backwards.

http://rides.webshots.com/photo/1277...34192742KTuPkY

http://rides.webshots.com/photo/1084...34192742KsCCrb

Sort of hard to see in some of the pics but they are pretty decent high res. You should be able to see that the flange is facing the rear of the car. Hope that helps you see how the pulley is supposed to be installed.

 

Just a cut and paste from the original poster.

http://i160.photobucket.com/albums/t...3/Image029.jpg

Tensioner pulley is backwards...

 

A few more pics...

https://www.rx7club.com/showthread.php?t=714260

https://www.rx7club.com/showthread.php?t=685741

http://pincusa.googlepages.com/IMG_2..._2437-full.jpg

The flange is always pointed to the back of the engine, not the front...

What do you think?

 

i orderd a new belt and i'll turn the pulley the other way then and see what it does. if it brakes again after 100 Km then it's something else i think

 

Not to question you, turbojeff, because you are much more experienced than me, but to add some more logic to the process:

If the pulley is on the wrong way, the belt should look misaligned. If the belt fits correctly with the pulley backwards, I don't know why that would make it fail. So, if it is on wrong, there should be a difference in the way it fits, compared to the correct direction.

Dave

 

The pulley will go on either way and work in either configuration (all other things being equal) Tom has had his on the same way as the one everyone says is backwards without any belt issues. I have mine on with the flange towards the rear of the car with out issue (most likely because that's the way it should be) but logic would have it move towards the bracket if the bearing spun in the pulley and the pulley were to walk off the bearing. If it did move towards the bracket the belt wouldn't necessarily come completely off without the pulley making a hell of allot of noise when it did so. I still think the original problem was the belt wasn't on the main crank pulley when it was installed and no one noticed when it ran up over the edge of the power steering and AC pulley.

 

To be totally honest with you guys I haven't ever put the pulley on backwards...

Maybe it does work that way. WTF I could be wrong!

 

Actually, it makes sense that it would put pressure on that edge of the belt, and at high rpm the belt could ride up the flange and then shred on the edge of it.

It makes me wonder why mine is on backwards... the original owner said it had never been taken off, and i haven't taken it off. So I am gld I know this now, before I got her running and chewed up a belt.

Thanks Jeff.

 

I was having this issue awhile back. It turned out that one of my pulleys was bad. Replaced it and never looked back!