Advice on gearbox/transmission problem ???

By any chance did you change your engine oil and drained the gearbox instead and have 16 quarts of oil in your crankcase?.......Don't laugh, long story!

 

Check the clutch and clutch hydraulics.
___________________
Samy

 

Yup.

 

I have to confess that your most recent post caused me to pay better attention to the first one. If the car is in N, no problem with the clutch or pilot bearing can cause it to creep forward. It has to be an internal problem of the trans. The short version is there are gear and shaft sets that should be able to turn in complete independance of each other and for some reason they are not. Something that should spin freely is binding and that may also be causing its reluctance to be put in gear. If 1st and 2nd are the difficult ones to put in gear the binding is probably in a different set. The syncros are having to stop something that is being forced to turn rather than turning freely and causing them to wear more quickly.

The amount of effort pushing the car in N would be telling too. If it is slight there is still the possibility that the shifting problems are a different issue.

In any event it is a diagnosis that really needs to be made in person. I have seen far too many incorrectly reassembled 360 shift mechanisims and broken, binding pieces to just point to one. It was a rather complex system when you tally up all the bits and pieces.

Is there any freeplay when the shift ball is moved in a side to side direction?


Also, was there any work or event that happened to cause it or took place just prior?

 

You are misunderstanding what freeplay is. It should have almost none. Freeplay and movement are 2 different things.


Without getting into a discussion of who works on your car this problem really really needs to be done by someone very up to speed on 360's. The trans and shift mechanisim are very different than any Ferrari except the 430

 

One of the big problems I find is that mechanics do not have all the special tools to do a job which encourages them to short cut and or make a diagnaosis that may not really be the "diagnosis". For example there was a clutch change and 1/2 synchros done. Well if the clutch plate with marcel compressed is within spec it is within spec. Also common sence would tell you that if you engage the clutch and it stops the car moving forward that the clutch is doing its job in disengagement. You can spec your flywheel and its companion pressure plate and clutch disc and if it is within spec you don't need a new one. I think you bought a new clutch that was not needed. If this was part of the diagnosis it sounds wrong from what I understand about clutchs. It is also easy to test a total linkage fubar by just disconnecting it and putting the gearbox in neutral to prove that linkage is not causing the moving in neutral issue. I believe that the mechanic took a short cut and found 1/2 synchro out of spec and assumed it was the problem and did not look for other problems or spec out the remains of the gearbox. While I have not taken a 360 gearbox apart it still follows all the laws of gearboxes and has a main and layshaft with companion gearsets in and out of mesh controled by control rods ultimately feeding a differential and axle shafts. While there may be different parts the concepts are the same. It is just a manual gearbox. While not familiar with the 360, Another guess could be that Ferrari has made gearboxes with syncho bodies with very difficult to properly place syncho pads and springs which control tension and deflection of the body, ring, and sleeve. The mechanic may have failed to bench test synchronizer function. Something is out of spec and binding to cause the lay and mainshft which can rotate independantly rotate tied together. Running the car this way will destroy more parts. Assuming you can definatively take the linkage out of the equation you will need to spec out the entire gearbox which means new seals and new bearings and adherance to WSM specs and proper assembly. You need to find someone who has done one like Brian and not have someone learn on your box and your nickel. I also would not assume FNA can do it, though they may be capable. Those part replacers scare me sometimes. Good luck!

 

Hate to drag up and old thread, but I was wondering what the final verdict on the transmission was, Schumi. I'm having similar symptoms in mine.