F355 Gear Lever Jumping Out of Second Gear

I've noticed recently that my 355 (5.2) has been jumping out of second gear into neutral. I really need to pull the stick back hard to make sure it stays in there. I haven't noticed any problems with other gears, there are no rattles and the gearstick goes into all gates smoothly when the gearbox is warm.

Is this more likely to be a wear and tear issue on the gearstick mechanism or an adjustment at the rear.

https://www.ricambiamerica.com/car-diagrams/ferrari/v6-v8/355-group/f355-m5-2-1996/outside-gearbox-controls.html

I have a new clutch, new 1/2/3 gears and mainshaft, new synchros on 1, 2, 3... My engine and gearbox mounts are good. After the recent overhaul of the gearbox, the clutch pedal engages gear quite high up, but it's not a problem.

At first, the loud clicking noise as the lever jumps out of gear makes me think the passenger seat has moved forward into a detent in the seat track (not that a Spider electric seat would do this), but then I try to accelerate and nothing happens...

Thanks in advance,
Cheers

 

Thanks, gents.

Sorry... seems my memory is getting a little fuzzy... I rechecked my notes...... It wasn't gear sets 1, 2 and 3 (I was confusing it with the synchros changed):

In January 2018 (500 kilometers/ 300 miles ago), I had the gearbox overhauled due to large bits of teeth found on the magplug. One of the main shaft bearings failed and it damaged a lot of components, including the main shaft. I'm not sure which gear set comes as standard with main shaft (1st?), but gears sets 4 and 6 were also damaged.

I don't recall any problems immediately after the overhaul. However, I had a major done 4 months later (about 300 kilometers/200 miles ago) and I did have to take the car back after the leaving the workshop after the major because I couldn't engage some of the higher gears. I helped the technician adjust the gears (me changing gears, the technician doing the adjusting under the car). I can't recall having any problems immediately after that, but as you can see, I haven't done much driving. I'm not 100% sure when the problem started.

Here are a couple of threads associated with the gearbox damage/overhaul

http://www.members.iinet.net.au/[email protected]/FerrariF355Spider/DamagedGearShaft.jpg

https://www.ferrarichat.com/forum/threads/complete-pinion-for-6th-gear-not-as-spare-part-f355-5-2.564215/

I have Redline friction modifier added to the Redline gear oil (in recommended quantities after a gearbox overhaul).

As you have recommended, I will do more tests on 4th and 6th, then take my car in for adjustment.

Thanks!

 

Sorry, Rob, just getting used to the terminology. I guess you mean parts 37, 36, 38?

https://www.ricambiamerica.com/car-diagrams/ferrari/v6-v8/355-group/f355-m5-2-1996/outside-gearbox-controls.html

I'm sure the nuts are tight (I have faith in my technician), so perhaps it's just out of adjustment. Perhaps if the car is jacked up in the air, the body flexes enough to put the adjustment out when the car is put back on its wheels?

 

That's basically how I did it on my car with the tech, Paul.

Just wondering how sensitive the adjustments are. e.g. one turn = x millimetres (fore-aft) at the gate. Will increasing the length of the rod be more likely to fix my problem or decreasing the length? Will the length adjustment throw out the rotary adjustment?

 

Unfortunately, this problem is getting worse. My tech adjusted the shifter linkages until they were perfect. i.e. no problem selecting any gear. Unfortunately, on my way home, the gear lever kept jumping out of second. On one occasion, I tried to stop it jumping out and there was a horrendous sound of gears clashing. I immediately released the gear knob and let it jump into neutral. I avoided 2nd for the rest of the trip home.

It doesn't appear to be an external linkage problem. Looks like I'll have to save my pennies for a gearbox overhaul.

 

The km's are low, but the time is now long (4 ~5 years). Anything could have broken in the meantime. Half the gearbox was changed. Probably the other half needs replacing

Here are the parts on the bench...

https://www.ferrarichat.com/forum/posts/145686727/

Thanks to @MAD828 for the photo

 

Update: There doesn't seem to be any new sliders (synchro sleeves) left on the planet. i.e. part number 156931. All the other parts are available for 2nd gear. The factory doesn't have them, and I've tried Superformance, Eurospares, FerrParts, Maranello Classics, Scuderia Car Parts... and Ricambi shows unavailable. Hill Engineering doesn't make them (yet).

Anyone heard of atd.parts in Germany?

They are also found on 456's and 550's, so this could be an issue for a few folks in the future.

 

Hill Engineering make sleeves for earlier cars and charge U$900 for them. I'm guessing they are difficult to make. Eurospares suggested buying a second hand one and using that as a template.

Having said that, it looks like Scuderia Car Parts have just found me a new synchro sleeve (from another company). Yay... but now Eurospares have said they can't supply another part I ordered. One step forward, two steps back....

 

Here's a comparison between the Ferrari sleeve and the Quaife sleeve.

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The Ferrari one seems to be a little more complex.

 

And here's the quality you would expect from Hill Engineering UK

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