Nightmare Week

[Elliot]

Yesterday women across road broke my headlight unit - Great!!

Today i washed the car so i could take it to be assessed. Drove 50 yards down the road and heard a whoosh noise from the rear

Flip - i had left the cloth in the bay that i cover the engine with whilst cleaning and it had rotated and snapped both Alternator belts.

Stoped instantly. Picked belts out, nut and shim had come off spindle, pulled cloth out very cross wirth myself.

Anyway - drove very slowly the 50 yards back to garage and belt light came on and ABS light.

Question is - Why does the ABS light come on?

hopefully a belt refit and tension should do the job but not feeling great tonight.

Has anybody had this happen to them??

Any advice on fitting would be welcomed also

cheers Elliot

 

[szklarek]

Does sound like a nightmare! Wouldn't worry too much about the ABS light - the two times I've had the belts go the dash has lit up like a Christmas tree and returned to normal as soon as the belts were replaced. I don't know if perhaps the electronics shut down once they realise that there is no alternator power.

Can't help with tips on the belt replacement as I've always had it done at my local indy - although with the right tools it should be very straight forward.

Hope you get it all sorted.

Anton

 

[A Ward]

The belts are pretty straight-forward to renew - it is just the tensioning of them that is important - the shims that came off are what provide the tensioning of the belt; and they are either fitted or removed accordingly to adust tension.

The porsche manual states that the hex head nut is 50Nm +/- 5 for torque when securing the pulley, but you need to secure the inner spindle with a splined drive which means you will need a crows foot or such like to torque it, or simply a spanner and apply what you feel to be 50 Nm.

It also states to only rotate engine at lower belt pulley or by operating starter, and to make sure that the hex-head nut (mentioned above)on the alternator shaft is fully tightened after completing renewal and tensioning.

There are 2 different types of shim 0.5mm and 0.7mm - the 0.7mm is identified by a 2mm drill hole through the shim. From memory removing a shim from between pulley halves and refitting in front of the front pulley half increases belt tension - it should be obvious from the tapering of the alternator shaft.

As you can probably imagine there is a special Porsche tool for measuring belt tension and specifications of 23-35 increments for a cold engine, and 28-40 increments after you have run the engine for 15 minutes at idle or 10 mile drive.
It is unlikely you will have access to this tool, and although belt tensioners are readily available I am not sure it is worth the cost of purchasing one for this infrequent job.

When I renewed mine (due to wear in the teeth through to the outer sheath) I gauged it by the tension that my brothers was set at, and set mine to a similar level using the mk1 eyeball and finger. So if you have someone locally that could perhaps bring theirs over for a comparison? It is always more fun skinning your knuckles with an audience anyway!!

Best of luck.

 

[szklarek]

Just remembered - I think there was also a pulley replacement for the 993 which would be well worth fitting if it hasn't been done on yours. Somebody else on the forum, with more information, might be able to advise.

Anton

 

[A Ward]

Hi

The pulley only needed to be renewed if the belt failure occured as part of normal operation caused by the pulley - and I believe only affected certain models with a specific pullet part #.

As the OP stated that he left a rag in the engine bay following cleaning - and that got 'dragged in' and knackered his belts - I would think it is unlikely that he will need to renew the pulleys (unless they got damaged in the process)

There are 2 technical service bulletins pertaining to the pulley and belt tensioning - links to both are below - I hope that I haven't breached any rules by posting the links up...it is info readily available on the internet.

Belt tensioning - http://www.pcarworkshop.com/images/e/ed/1378_1994_611094geolab.pdf

Pulley bulletin - http://www.pcarworkshop.com/images/7/7b/Pulley_update_1997-06.pdf

Hope that helps you get your car back on the road quicker - it is not a difficult DIY.

Regards

 

[A Ward]

And as if by magic - here is a link to belt DIY with photos

http://www.pcarworkshop.com/index.php/993_-_Belts

 

[Elliot]

Thank you very much for your replies

Ordered two belts today from Lancaster Porsche £25 which i am sure i could have got cheaper elsewhere but thought she deserved the real mckoy as i was so mean to her.

Thanks for links - will study and give it a go on tuesday when belts arrive.

Elliot