Fiat Coupe Club UK

Cause belt breakage

Posted By: carmine

Cause belt breakage - 03/12/2018 17:02

Hello.
I ask for information to those who had experience with distribution belt failures.
I wanted to know,
breakage of the timing belt is more common, caused by: wear / time / km etc.
Or is it caused more frequently by the service belt, than by breaking itself it coils on the main belt causing it to break?
Thank you.
Posted By: Anonymous

Re: Cause belt breakage - 03/12/2018 18:13

The 20vt cambelt is pretty strong, it's more common for the aux belt to fail and the remains to get wound around the crank pulley and into the cambelt causing it to fail.

1 or 2 guys did make pulley guards to stop the aux belt failure interfering with the cambelt.

I left my cambelt for 10 years but it had only done about 30K miles. It still looked fine but had stretched to the point of being a little loose, so it really did need changed by that time.
Posted By: barnacle

Re: Cause belt breakage - 03/12/2018 19:18

For 16v owners, however, the cam belt is a lot more fragile... it's quite happy to break on its own, without troubling the aux belts!
Posted By: carmine

Re: Cause belt breakage - 03/12/2018 19:52

OK understood.
I had seen somewhere, the pulley to protect the cambelt, any of you know where you can buy?
Another question, to change the belts of services and need to move the engine?
Do I have to change everything?
Thank you very much.
Posted By: carmine

Re: Cause belt breakage - 04/12/2018 20:01

Does anyone know where to find a guard pulley?
Posted By: Anonymous

Re: Cause belt breakage - 04/12/2018 20:09

Try http://www.midlandscarservicing.co.uk/
Posted By: Submariner

Re: Cause belt breakage - 04/12/2018 20:17

I read that on fitting the main belt it has 150% of the strength required and at end of the belt change duration/mileage/cycles it is still at circa 100%. One Coupe mechanic told me he has never seen the main belt go on it's own on the 20v turbo; it is as we know the aux belt/tensioners etc that usually take out the main. I have taken the main belt up to 8+ years and circa 40k+ miles (wouldn't recommend it though) but do the aux belts and tensioners every 3-4 years.

JBT http://www.midlandscarservicing.co.uk/ had a pulley manufactured with a guard I seem to remember.

Traffic light Grand Prix's and banging the car off the limiter are a no-no for the Coupe and it's belts IMO especially so if running big power increases.
Posted By: Countrycruising

Re: Cause belt breakage - 05/12/2018 16:48

I have known the pulley guards not to work and still allow an aux belt to jump and be caught by the cam belt, one last year and another big bhp build in Germany so I've copied Flea's design, new batch being made from stainless.

click to enlarge
Posted By: carmine

Re: Cause belt breakage - 05/12/2018 21:33

thank you all for the answers.

Mr. countrycruising
I would be very interested in the coverage shown in photos, bhp and a user who lives in germany?
can you please give me some other information?
I'd like to have a protection like the one in the picture?
thank you.
Posted By: Countrycruising

Re: Cause belt breakage - 06/12/2018 09:11

Originally Posted By carmine
thank you all for the answers.

Mr. countrycruising
I would be very interested in the coverage shown in photos, bhp and a user who lives in germany?
can you please give me some other information?
I'd like to have a protection like the one in the picture?
thank you.


I'll send you a pm after I have received the guards, we can chat further then.
Posted By: jonnyboy54321

Re: Cause belt breakage - 06/12/2018 09:16

Joe - you have pm from me ref these
Posted By: carmine

Re: Cause belt breakage - 06/12/2018 11:14

Thank you,
I will wait willingly.
Posted By: carmine

Re: Cause belt breakage - 18/03/2019 11:59

Hello everyone.
I apologize in advance for this,
I wanted to contact Mr. Joe with a Pm but I couldn't
(shame). box
I wanted to ask Mr. Joe information about the timing belt guards. bow
Posted By: barnacle

Re: Cause belt breakage - 18/03/2019 12:39

pm country_cruising.
Posted By: Edinburgh

Re: Cause belt breakage - 18/03/2019 13:33

Originally Posted by carmine
Hello everyone.
I apologize in advance for this,
I wanted to contact Mr. Joe with a Pm but I couldn't
(shame). box
I wanted to ask Mr. Joe information about the timing belt guards. bow


He's been "away from the office" for several days carmine but should be back very soon if not already...
Posted By: carmine

Re: Cause belt breakage - 18/03/2019 15:03

Thanks for the reply
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