Ferrari 355 Gearbox Adjustment Tool AV2731 or 95972731

As far as I can recall, it only jumps out of second gear (repeatedly). As soon as I use any accerator, it jumps out and I can't hold onto the stick to keep it in gear. The gearshift linkages have be finessed endlessly.

Somewhat miraculously, I was able to find a new gear, shift fork (#20), 1st/2nd rocker arm control fork (#32), spring, ball bearing and a few other assorted pieces* to be fitted after I find/make a tool for the job. I just want everything to go right this time.

*The slider I could only find second hand and I may have overlooked some parts related to 1st/2nd.

Thanks... By selectors, which parts are these? I'm wondering how critical the interference fit is. Hopefully, the tool can be modified afterwards if there is too much interference.

This I'm not sure of. I don't see anything turning "sideways".

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The 1st/2nd fork doesn't seem to have any matching fork control rocker arm. Is it only driven by #32 on the end of the rod?

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The other forks seem to have slots for matching control arms.

I'm having trouble understanding which parts are hitting what.

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Are the control rocker arms (1, 2, 3, 4) hitting the fork control rocker arms (39) or the "rod control small forks" (32, 33, 34, 35) or both?

Unfortunately, YouTube doesn't seem to be too much help as the videos don't show the control of the forks.

Sorry to take up so much of your time.

 

Here I'm completely lost. Is your small tool replacing ours? Which angle are we talking about? Is the bevel on the edge of our tool critical?

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Understood, but I would like that tool made up as my indy tech has requested it. He seems to have everything but that.

Slider part 14... P/N 164126?

Strange, I'm not seeing available. Only "Enquire/POA"

 

Understood, Brian. I am not doing the job personally. I am not a mechanic. I am a retired avionics maintenance engineer with some electrical knowledge. Through necessity, I have had to switch to Ferrari electrics (steep learning curve here).

Recap: I only have one tech near me who sounds remotely competent to complete the job. He even told me how hopeless the local dealer techs were when it came to this kind of thing. He has been trained by Ferrari. He requested the tool (before the job is to be started). I've been looking for this tool for over 9 months. I don't live in the USA. I'd be surprised if even my local dealer tech has this tool. We just need as much knowledge as possible to design the tool (especially to know if there are any critical measurements). None of us currently have access to a gearbox. There aren't that many F355's in Australia, let alone ones with gearbox issues.

The gearbox had dozens of parts replaced after it blew up several years ago. The obviously broken parts were replaced. Some wear items may have been overlooked at the time, but we took the opportunity to change some normal wear items like lower gear synchros and the gearbox seemed to be ok after the overhaul. As far as I can recall, several (?) months later, it would occasionally jump out of 2nd gear and I put it down to me not putting the lever in the slot properly, but now it happens every time I select 2nd gear. My tech probably doesn't want to take any chances and I imagine he wants to go by the book this time.

I'm ordering as many parts as possible in the hope that one of them is causing the problem. One part took me 3 months to procure. I don't want my car in the shop for 3 or 4 months.

No, I am not familiar with all the terminologies of the gearbox. I assumed a "slider" was the rod on which the fork is mounted. From your message, I see it is called a "synchro hub" in the parts manual. Yes, I have a new one (although it may have been changed the last time). I've simply been ordering everything in the 2nd gear "train". I can always give away the unused parts later FOC to my fellow needy F-chatters.

 

Fabulous. I guess that takes the place of this tool



Haven't seen one of these for sale for a while.

That looks harder to make.

 

When you say that other tool holds the shift rods in place, how does it apply force on the rods when the rods run in a different direction?

 

I'm guessing the thumbscrews are spring-loaded. I wonder if that's necessary.

 

I think the spring loading may allow some lateral movement when fitting the tool over the shafts... When the shafts are located, I guess the screws can be fully screwed in. We'll have to ask the experts.

I guess the elongated holes in Wade's tool provide the same function.

 

Did you use the original tools as templates?

Looking at an old video of my gearbox, I see the mounting point for the thumbscrew tool

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I guess it would be possible to take measurements from this.

Short video of the 1001 pieces

https://youtube.com/shorts/s9HsjqN6odg?feature=share

 

My mechanic is highly recommended, his prices are good and he always goes out of his way to help me despite being always busy (because of his good reputation). I am simply returning the favour.

As I have explained, he only has a small workshop and I don't want to occupy significant space in his workshop should a part not be available in the short term. When I have a major done, I supply all the parts that I think that will be required to help him out (timewise).

I'm not doubting your credentials or advice. I just don't have the resources (money) to send the car to you This is not Mainland USA or Europe. My choices are limited. No one here routinely overhauls F355 gearboxes.

Maybe someone can tell me, if it was a simple adjustment problem, why has it been progressively getting worse in time? It seemed ok when it left the workshop.