Hi Guys,

I have been having serious problems with my alternator/fan belt, it keeps breaking all the time. Furthermore, as can be seen in the following pics, it flips upside down in preparation of breaking up.
Ive noticed some rust in the crank pulley.
Im just clueless on how to solve it.

thanks

Najeeb
--------------
'95 993 Iris blue

 

Hi,

I think that firstly you need to establish why one stud is so much longer than the others. Take them all out and make sure they are all fully threaded in and seated as if one isn't in, the pulley will flex as it goes round throwing the belt. Also, do you have any shims between the pulley halves which determine the belt tension?

Having said that, looking at the amount of belt deflection at the belt sensor I would say the belt is either way to loose or you have the wrong belt.

Hope that helps
GR

 

+2

 

then the little wheel stops spinning and cuts the belt then you call for a flat bed.

 

There is a pully update for the 993 with cast metal pully halfs. I did the update years ago. Some cars had problems some didn't. I noticed the red fan. I have not seen this on a 993 before. Is your fan the stock set-up or did some previous owner do somthing?

I have attached the technical info on the pully update.
Andy

 

On my stock 1996 993 there sre two pullys one attaches to the end of the alternator shaft the other drives the fan at different rate. Seems different than your pictures. See attached

 

+3 on guards red's comments. Belt is way loose, should deflect 1/4" or so from straight with finger pressure. If the pressure of the sensor is doing that, its loose. Remove shims between pulley halves to tighten.

btw, with the RS Pulley set up you can remove the sensor now (search for how to avoid a permanent dash light)....you'll get an alternator warning light if that belt goes now anyways.
<edit>Also a reason to get rid of the sensor, the sensor wheel has been known to self destruct, then can wear the belt and take it out. hmmmmmm, convincing myself to do the RS pulley conversion now...

pp,
this is the RS pulley setup that combines the normally separate fan & alternator belts into 1. Do a search on "RS pulley" for more info. Due to this, there is no need for the updated (outer) alternator pulley you reference, because its just not there. And his fan has been painted.

 

I think your sensor will also be vibrating like crazy on that belt with all the indents in it. Try a porsche or similar belt. As others have said its not a tensioner (the round roller) only rides on the belt to show it's not broken. It should not be pushing in on the belt.

 

Replace with factory belts. Aftermarket are typically not sized exactly 760mm and 776mm. Don't know if that's why, but I've had a couple failures with aftermarket and none with factory.
Disassemble your pulleys and see if any shims present. If not, likely too tight. Get a crikt belt tensioner and figure out how to use it. Not perfect but will do the trick.
Recommend you get replacement bolts for fan pulley before you start as a precaution.

 

Oh, can't see pics on my phone. Sounds like you have RS setup from thread.

 

Hi gents,

Where i can buy the pulley halfs online, i have the same problem, The dealer in my reagion does not know about the updated pulley.

Thanks

 

The pulley ont the red cooling fan does not look right, I have a RS pulley and it does not have studs, just the 3 bolts. The pulley on the red fan is also chromed?

What I also would like to know: how is it possible that a V-belt gets turned up-side down during normal operarition? (too lose?)

 

Search for "alternator pulley update" here on RL for more info.

HOWEVER, first figure out why you have the same problem as the OP.....is your belt tensioned properly? (The OP's belt is far too loose.) Lookup "Kriket" (which is the belt tension measurement tool) or "belt tension".

Can't comment on RS pulley version or bolts. Pulley might be silver, but the rim is also being regularly polished by the loose belts that get thrown so it may be shiny because of that. As well the front of fan is showing some "polish" itself...

 

As others have stated, start by using the proper Porsche OEM belt. Any other belt doesn't have the right V profile, or are slighly different in size causing CEL's and other gremlins.

Also, maybe an optical illusion, but I see a small dent on the crank pulley? I see it on your first 2 pictures, close to where the belt is at the bottom. Check closely and make sure that there is not a dent or a pinch on that pulley as it may be squeezing the belt out.

 

His photo's show the belt flipped upside down = the indents.
:-)