3rd and 5th gear crunch F1 360

Begs the question: What does your mechanic think is the problem?

 

What I would be wondering if it were a stick is if the alignment of the cables were off, of if the clutch weren't completely disengaging or dragging.

Are there any leaks of fluid from the holes below the clutch housing? (might suggest in complete clutch actuation)
Are they any leaks from the valve body in the right fender? How about from the hoses or the actuator on the transmission?
(rationale here might be that if there were a leak from the 3rd or 5th gear actuator that might result in slower or incomplete actuation of the gear selector for 3rd and 5th gear.)

Because the F1 system is mechanical, there shouldn't be any imperfection in the selection of the gears or synchro wear like you have with "imperfect" shifts with a manual shifter. It should all be perfect and timed consistently. Only thing I can think of (and I'm not an F1 guru) is that the selection of the gears in the gearbox by the hydraulic mechanism is imperfect, and for those gears only suggests it might be those actuators and their mechanisms.

 

Is your mechanic a local gas station mechanic or a Ferrari mechanic? I ask because he focused immediately on the gearbox but no mentioning of him diagnosing the hydraulic or electrical aspect of the F1 system. I would do a purge and bleeding of the F1 system and initiate a TCU relearn to see if that will solve the problem.

 

My 2002 is doing the same thing. I also switched to a CS TCU a few hundred miles ago. I would describe the noise as more of a clunk shifting into 1st, 3rd, and 5th. It gets worse as the car warms up. I'm hoping it's a TCU setup issue. I haven't talked to my mechanic about it yet.

 

If there is too much LSD additive in the 75W-90 transaxle fluid, the synchro rings get too slippery to do their job.

 

GL4?? I thought it was GL5., as in 75w90 NS of redline

 

You have a PM.

 

My car has exactly the same issue. Who is your mechanic? My mechanic told me it was a sticky throwout bearing and that I needed to replace the clutch. $6000 later the problem is still there. The fact that it is temperature dependent makes me pretty sure it isn't actually the synchros, I think it is a problem with hydraulic leakage in the F1 system causing an incomplete throw of the clutch. I have tried bleeding and flushing the F1 fluid with different ATF blends and it makes a noticeable difference, but hasn't totally solved the problem. Next thing I want to try is replacing the bleed block with a hill engineering one. It's possible that as the car warms up the fluid gets thinner and seeps through leaky seals more. The funny thing is, if I shift over 6000rpm at full throttle it's fine, I think because the system is asking for max pressure on the clutch release.

 

why can't you switch back to ur old TCU and see if problem vanish?

 

I installed a cs Tcu and having the same issues. If I try to shift to aggressively I get grinding. If I back off the throttle then no grinding. And it does it in any gear. I’m going to install my old tcu and see what happens.


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Did you setup the PIS correctly after putting in the TCU? It sounds like your PIS is too low if it's every gear.

 

My mechanic has the car now. I'll post if he figures it out. Otherwise we'll try putting the original tc u back in.

 

Yes the synchros are likely worn, but why did that happen? You could change the synchros, but in my opinion we haven't diagnosed the problem yet. I did a flush of my F1 circuit with different fluids and noticed very different results. I think there is something definitely going on with the F1 system that causes this, although reading the transmission oil thread makes me worry that GL-5 may have contributed to the synchros dying in cars that have been parked most of their life.

 

I had same problem after changed my oldest TCU to CSTCU. (did some post in other thread about this problem)
2000, F1, 360 Modena

Problem seems solved with transmission oil change in my case, so now sharing some information.

After changed to CSTCU, strange crunch noise started when shifting 1st to 2nd, and 4th to 5th.
adjusted PIS when changed to CSTCU with Leonardo (PIS = 4.398, with NEW clutch component)

Change back to original TCU, but still same big noise, so, worried much (transmission is damaged !?)

Asked to few ferrari professional engineers and their answer was
1. Mission gear problem
2. Synchro problem
Really bad.

But, seems not in my case.
one engineer tried what he can do to solve this problem.

Thanks to him, problem solved.

1. change PIS to 4.477
2. change transmission oil to Fuchs sintopoid 75w 90 LSD
3. drive around 1 week after small noise

after 1 week, strange noise disappeared almost completely (very little noise), and now shifting with no problem.

one problem is that LSD seems a bit noisy chattering when driving very slow.

so changing transmission oil can be the key of shifting noise.
maybe according to other thread, "too slippery" can cause problem when shifting, and making sound.

Hope this information can be helpful.

 

My car was having a problem mostly with 3rd gear. Turns out the F1 pump was in bad shape. After a new pump and accumulator it seems the problem is solved.