512TR Gearbox problem.

The postman delivered my Forza Components diff yesterday. It looks as good as it gets. Very nice piece of work. Now it is up to the other parts for completion.
To hear again about another failliure makes me confident that the TR and the 512 TR and the 512 M have a clear issue that first needs to be attended. And yes, you're reading right, my friends 512 M in Italy had even a diff problem with his car but replaced it with a OEM.
I think these cars are beautiful and can be enjoyed in their range of potential when basically equiped with a proper diff. So, don't wait for the bad vibe strucks you. I was in luck with only (!) a broken diff and a broken main shaft as a result. I could easily be confronted with some nasty cracks in my gearbox housing.
I feel that a better diff is no guarantee for other gearbox parts to parrish. But for normal intended use this is no special issue of concern in my opinion because every car that is going to be used on track or abused, will have failliure. Am I right?
Image Unavailable, Please Login
Image Unavailable, Please Login

 

You are absolutely right Marcel!

Did you order next to the diff the 2 Timken bearings and a shimm set also ?

Please keep us informed of all the work that will be done shortly

 

Hi Mel,

I asked Phil about these bearings. he said that dimensions are equal so the new ones allready ordered are just fine to match the diff. Rest is at the gearbox specialist too.
So everything is ok in this perspective.

Best

 

Any improvements/progress Marcel ? Any photo's available ?

 

After my purchase of the diff my next challenge was finding a second speed gear set.
The smallest gear of the two had lost much of its hardened surface and needed replacement.
In Italy I found a fine used set for Eu 2250,- . This is just Eu 400,- less than a new set from Eurospares. For me an easy choice. I ordered the set in the UK of wich I can be sure that it is matching and the quality will be better.
Together with the main shaft, new bearings, shims etc this week everything should be considered as gathered. Then, at last, it all can be put together again.
I enclosed pics of the new diff, the old second gear with the wearing signs on it and the new second gear set.

Best, Marcel
Image Unavailable, Please Login
Image Unavailable, Please Login
Image Unavailable, Please Login

 

You are absolutely right ordering a brand-new set ... would pitty yourself if -after all job is done- your gearbox would squeek in that gear all the time ...

Good luck, we like to follow your improvements here Marcel! (Drop me an e-mail !)

 

Just wanted to say that I hate the differential on the 512 TR. 6 hours ago I busted it for the second time. And the first owner before me had it done 1 time. So 3. times overall for my 1993 model 512 TR. First time must have been around 40 000 km. The next around 55 000 km and now at 85 000 km.
I have sent Forzacomponents an email.
Just hope the rest of the gearbox is OK...

 

Janrb17, what broke? Did you do the upgrade?

 

may be the 2 times before they put in an "original" diff?

 

Sounds like thats exactly what they did Romano.
From memory I believe Melvok had the same in his 512TR a few years back.


Phil

 

Yes, of course that is what happend; the oem dealers MUST install oem parts ....

We had a great and heavy discussion here with an official F dealership.

Owners wanted an upgraded Forza diff; dealer said he would not install it because the factory would punish this dealership if they found out.

Happened in my car exactly ALSO ! So the Forza diff was the third diff in .... at 75.000 kms.

The second diff must have been installed before my but at 56.0000 ...



He guys ... despite many doubts .... IT'S STILL GOING ON ! ... so not IF .... but WHEN in yours ....

 

Is the chim and bearing set offer new on the forza website?

 

I think so ... (shimms) ... Christian, but I am almost sure Phil will react on your Q !

 

At the time i made the upgrade i didn't saw the new bearings but my bearings were like new, so no problem.

But i remember that it was a little bit work to fit the diff excactly and perhaps the new shim set is a strong buy for other who plan the upgrade.

 

Imo it is absolutely wise to install new bearings allways if a gb is open; shimms will prove themselves as only then the diff will fit perfect.

Phil tweets that he is not able to answer your Q himself right now due to work but the shimms and bearings are available through Forza.

Bearings link and shimm link

Nice: I only now see that Forza has a brandnew site !!!

 

Yes, although my bearings were fine, a change would been wise.

But i think they will not give me problems.

 

Your gb is absolutely fine imo Christian !

An upgraded diff is so important and:... an investment imo

 

The car has not been taken apart yet. Will be repaired in the autumn/ winter.
I am not an expert on cars, but I have been thinking a bit more about "my case": when the gearlever is in the middle ( free/ no gear) - the rear wheels lock up after 2 meters when pushing the car by hand. And when I tried to drive it directly after the incident, it did go 20 cm forwards before "klunk!" and "slipped". Like it was missing a few teeth.
So I think it can be either pinion, crown wheel or the diff pack itself. Maybe the diff-pack is ok?? ( when I rotate the one wheel, the other follows in the same direction - is that evidence that the diff pack is broken??).
But anyway it will be a huge repair. And my question is now; do I install something else this time? The diff is OK - I will use the Forza-diff if its still available. But what about pinion and crown wheel?? Are they being made by someone other than ferrari also?

 

Where you with us in Nordic F-club meeting this year?

 

Be prepared for the worst ... as happened to me .....and start saving lost of money already

Who is your gb builder ? I know a fabulous gb builder near Hamburg who did mine ....

I know that Romano has a good set op C&P for sale; better than pay K$10 for an aftermarket set ...

But a few factories are able to make them .... IF they want to do that and IF they find time ... (took me 6 months waiting )

 

I am using a local but experienced ferrari/lambo-repairshop ( Autocura.se). The last time I used a german repairshop ( bpr-racing.de). The guy who did it then was very good and had worked on ferraris since the 1960. And the first time the diff broke it had been installed by ferrari ( at the factory when new). So I guess even if its correctly installed it may brake.

 

Jan, what Mel want to explain is that for a perfect diff install there are not many shops around who can work out that.

Gearbox is really a very special part!

 

Correct ! Only a few can really install Diffs and GB's ... BB-motors in Stuhr/Bremen is one of the very few I know ...

For that reason we invented UPGRADE diffs Jan.

READ this thread, take time for it ! It explains why OEM diffs fail and will fail in future !
Image Unavailable, Please Login

 

Yes, Christian I understand that. Maybe the first repair back in 2004 was done badly ( licenced Ferraridealer in Switzerland) because som oil canals had been clogged with gearboxsealent when sealing the gearbox. But the second repair was by a renowned Ferrari-Wizard in Ludwigsburg near Stuttgart. And the first time the diff was installed was by Ferrari in Maranello. It has broken every time.
I drive the car quite hard, but I don`t abuse it ( I did do a couple of donuts a few years back, but never gonna do that again). Typically I give full throttle in every gear at least 10 times every hour of driving. Maybe the car just isn`t up for it....

 

If you read this thread Jan (please DO !!) you will read that breaking of the diffs has nothing to do with riding hard or not ...

It's the wrong (too weak) construction of the F factory .... it was created for the F365 with 300 PS and used in the TR with 400 PS ...