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/~b744er@ozemail.com.au/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?