I have an 87 TII with S5 block and S4 internals. It has the S4 front housing with S5 waterpump and alt. i am also running the dual alt pully with two 15315 goodyear belts. at anyting over 6-7k they are flipping over on teir backs for some reason and it is getting very annoying. can anyone make any suggestions on why this is happeniong? i drive the car fairly hard, it sees alot of high rpms.

a coupel of things i was thinking were maybe to use a narrower belt to stay in the grooves? maybe i am using the wrong alt or maybe my pulys are slightly out of alingment somehow? since they are S4 and S5 pulleys?

please share your experinces

thanks!
brandon

 

sounds like the alternator spacer is backwards, the spacer is to the rear right?

 

check your belt alignment its fairly easy to do.

but putting on thiner belts realy wont help if your pullys are out of alignment.

 

They dont seem to be, the S5 alt that i have has NO spacer on it, it seems to be in good alignment however. i dont get it at all... i will try different belts and report back..

brandon

EDIT
What belts do you guy use? The ones i was using were "Powertorque".. lol
they are a cheap brand from goodyear

 

Could you rev the engine up to 6k & hold it there with the hood up to see if you can observe what's going on?

My first guess would be the alternator spacer issue, but you said that's not the case.

My second guess would be belt tension. I'm pretty sure my belts don't have enough slack to flip. Try tightening them a bit more?

-=Russ=-

 

you said the alignment is good so i will assume it is, even a loose belt should not flip so i only can imagine it is due to cheap belts on a pulley thet the belts do not like. a cheap belt with not enough reinforcement will be rubbery, a rubber band will twist but a good reinforced belt with plenty of webbing should not twist easily so i would suggest just trying a better quality of belt.


take a look at the pulley grooves though, do they look like they have a straight cut or does it more resemble a "U"? the pulley could just be worn from rust and age.

 

I solved that problem by installing RB pulleys...

 

Dito


I used to break belts like every 3 months. Since i got the RB duel i NEVER break belts

 

i was running into a similar problem, my belts would wear thin, leaving powdered rubber dust everywhere and flip over and stuff...

s5 block and water pump, with s4 alternator.... they were aligned correctly, and not wobbling!!! i dont know why, only thing i could think of was rust on the main pully....

my other cars s4 alt is spaced obiously way off but its belt has held up for over 15K miles now...

 

is there a spacer that goes between the alternator and the pulley? Mine doesn't have one, and it looks like its farking up the pulley alignment.

 

I have seen a good pulley have one belt flip, then run great on a different identically sized belt. The first belt was simply defective.

I have also seen a pulley whose v-groove was worn enough that the belt rubbed the bottom of the groove. It would eat any belt you put on it.

 

I'd put the old S4 pulley on the new S5 alternator you have. I think that will solve the problem.

 

i have a similar problem. EVERYTIME i drive the car my alternator belt snaps of after i installed the FD alternator. What is the best thing to do? i used the S4 pulley but had to make the hole in the pulley larger. the aligment is okey and the pulley doesnt seem to wobble....