Crankshaft damper pulley fell apart

David- Have never heard of that on any of the 65 deg V12s, but maybe one of our pros has heard about it. Any other damage?

Bad luck.

 

I personally have only come across this a couple times in various models. Not the sort of problem we advise people to be wary of. I'm sure there are extenuating circumstances that led to this failure.

 

I think the same problem on a 456 , on Ferrarista forum !
And Most weird torsion damper failure on my 456M ->http://www.tifosichat.com/forum/456-550-575/379141-most-weird-torsion-damper-failure-my-456m.html

 

David:

Don't know about our V-12's, but had one fail on an older Mazda V-6. Like yours, it just fell off in the driveway. Shouldn't do any damage at those speeds, except maybe new serpentine belt. I think they just wear out with age and heat.

Regards.... Mark in Houston

 

Someone here had it happen a few years ago. I have seen it in older cars but not something as new as a 550.

It seems like it wasnt a great idea to have the inertia ring drive the accessory belts. Usually the belts are driven by the part mounted to the crank, not the rubber.

 

Can you post a picture of the damper/pulley .

 

Within the last year we've had 5-6 456/550/575 owners documenting their torsional dampers coming apart:

Luis..........2000 456M........45,000km
Romain......???? 456
Laurent.....????
JLuce.......???? 575
Ian..........1999 550...........24,000mi
David.......2000 550

Not counting those the pros have seen.

So what can be done to detect a failing damper before it lets go and wipes out some other expensive bits? I shudder to think about the consequences of one failing at redline.......

According to LuK who are one of the largest manufacturers of dampners and dual mass flywheels for the OEM's, the dampner should be visually inspected off the car for any signs of rubber degradation, then grasping the outer hub, try to turn it while holding the inner. Any sign of movement is an indication of a problem.

John Deere recommend the same, and go on to say that the radial runout of their dampner should be checked, and if over 1.5mm, it should be replaced. This is 1.5mm on a much larger damper than on our V12's, however.

I also wonder if putting a timing light or a strobe on the dampner and checking for jitter would be useful?

Any pro's opinions on how to detect a failing damper?

 

I just completed a major service on my 550M. I inspected the damper very carefully...and she looked perfect at 13 years old/11,000 miles. Speaking of crank dampers coming apart, I've got one here off of a bb where the rubber (appears) to have seen better days. Anyone know of a rebuilder?

 

I know this is on the other side of the country but I have used him for vintage V12 dampers and he was very good.

Damper Doctor 530-246-2984 1055 Parkview Ave. Redding Ca.96001

 

This is very common on the 456/550 and we are starting to see it on the new models as well. We pay very particular attention to them during inspections as the generally walk backwards and take out the timing belts and drive pullys.

 

Perfect. Thank you.

 

John- More of them failing than I thought. At $752 from Ricambi for a 575M, kind of an expensive preemptive replacement, though.

 

After reading a few stories, including Luis', I had the damper pulley replaced during a recent belt change on my 456M even though it looked fine...345 Euros for the part

 

Happy my bad luck served you. Mine cost me 1.200€ for the flatbed transport, plus another 1.100€ for the repair as covers and pulleys had to be replaced too. Luis

 

David- Happy no further damage was done.

 

The one on my BB512 was in very bad shape. The part is NLA nowadays, so I had my tired old one refurbished by these guys:

harmonic balancers

 

I had it happen to a 2000 550 I had a few years back. Just had the major service done only to hear that awful noise and rubber from a shaved belt on the floor. I think the car was 6 years old at the time.

 

I don't even know where it is !

Thanks Guys.


cheers,

Bill

I think I found it on Ricambi.

This it ?
Image Unavailable, Please Login

 

Yes , Ferrari référence 168565

 

Scantera and everyone: have we established whether it was quality problem of a certain badge of pulleys, or whether the origine of the problem is to be found elsewhere (or simply worn out pulley?)A number of guys, both 456 and 550, seem to have had the problem occuring shortly after belts change.
Chris

 

Thanks Bernard !

cheers,

Bill