456GT MT overhaul - Ferrari Life
 
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post #1 of 20 Old 05-20-2014, 05:38 AM Thread Starter
 
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456GT MT overhaul

I started gear overhaul
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post #2 of 20 Old 05-20-2014, 06:55 AM
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Certainly looks like a few teeth missing here and there.

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post #3 of 20 Old 05-20-2014, 09:56 AM
 
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Hi what were the symptoms and what caused the broken teeth on the gears?
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post #4 of 20 Old 05-21-2014, 12:41 AM
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Too many launches I suspect.

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post #5 of 20 Old 05-21-2014, 06:00 AM Thread Starter
 
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Quote:
Originally Posted by tazandjan View Post
Certainly looks like a few teeth missing here and there.
All parts are aligned.
The middle of decomposition still
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post #6 of 20 Old 05-21-2014, 06:03 AM Thread Starter
 
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Hi what were the symptoms and what caused the broken teeth on the gears?
This transmission is in a state that can not shift to the first and second gears.
In the early stages, it can shift gear oil if Atatamare. Last no longer accepts the speed at all.
Shift fork is worn to the limit value measurement result.
The other part is not measured
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post #7 of 20 Old 05-21-2014, 06:04 AM Thread Starter
 
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Too many launches I suspect.
Not Really
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post #8 of 20 Old 05-21-2014, 06:13 AM
 
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I am mechanically inexperienced but curious...

What happened the bits of metal that used to be the teeth? Did they disintegrate inside the transmission, if so this must have been problematic for the unbroken gears?

It must be nice to do this work for your own car - I can only imagine. Hope you have it back on the road soon.

Cheers.
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post #9 of 20 Old 05-21-2014, 06:24 AM
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The appearance of broken/missing teeth is misleading. That is normal. The problem that prompted the overhaul (appears to be) that there is excessive shifter fork/syncro clearance. That could be due to improper lubricants, poor materials to begin with...and/or simply resting one's hand on the shifter all the time (which seems unlikely).

FWIW...

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post #10 of 20 Old 05-21-2014, 08:40 AM
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Quote:
Originally Posted by David @ FluentInFerrari View Post
The appearance of broken/missing teeth is misleading. That is normal. The problem that prompted the overhaul (appears to be) that there is excessive shifter fork/syncro clearance. That could be due to improper lubricants, poor materials to begin with...and/or simply resting one's hand on the shifter all the time (which seems unlikely).

FWIW...
David,
affermative, same thing on the gearbox of my old 550, I opened the box Because During 2nd 3rd up shift sometimes scratched ....
I found, the three spring of synchronizer spheres was "tired", and the fork of 2nd 3rd gear was worn excessive, - 1 mm .....
I have replaced the two synchronizers, th efork and the 3+3 springs, after those replacements all ok.

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post #11 of 20 Old 05-21-2014, 09:25 AM
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Sorry to hear that. I suspect that was an expensive repair...

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post #12 of 20 Old 05-21-2014, 11:37 AM
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David- Fabio did it himself, so not too bad.

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post #13 of 20 Old 05-21-2014, 06:38 PM
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David- You can also tell I have never ripped one apart.

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post #14 of 20 Old 05-21-2014, 08:22 PM Thread Starter
 
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next
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post #15 of 20 Old 05-22-2014, 01:49 AM
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Jun, David, Terry,
fortunately in my case was the 3rd and 4rd gear, then in my case was sufficient remove the first gear box section, i not even removed shift mechanism.
Also on my gearbox, the steel cone on 3rd gear was overheated ..
As indicated on workshop manual, I have reset the cone surface with sandpaper and i have checked the coupling to the new synchronizer with Prussian blue.
The final chek is: pushing slightly and rotating with hand the new synchronizer on the gear cone, you will have to lock almost immediatly.
Follow some pictures of my revision, and the tools that i built by myself, is a gearbox easy to open and close.
Jun if you need to check the 2nd gear you must to open all box parts, you have a good work !!!
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post #16 of 20 Old 05-22-2014, 03:48 AM Thread Starter
 
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Quote:
Originally Posted by David @ FluentInFerrari View Post
The appearance of broken/missing teeth is misleading. That is normal. The problem that prompted the overhaul (appears to be) that there is excessive shifter fork/syncro clearance. That could be due to improper lubricants, poor materials to begin with...and/or simply resting one's hand on the shifter all the time (which seems unlikely).

FWIW...
I think that it's right.
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post #17 of 20 Old 06-27-2014, 01:39 AM Thread Starter
 
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1st 2nd fork wear limit
Small deficit in reverse gear
Metal powder in mesh filter




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post #18 of 20 Old 09-11-2014, 06:00 AM Thread Starter
 
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I strt assmble
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post #19 of 20 Old 09-11-2014, 07:14 AM
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Akai- Late in production (gearbox 1805), the 575M introduced an improved retaining set for reverse gear, a known weakness of 456-575 transmissions. You might want to take a look and see if those parts can be used on a 456 transmission.

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post #20 of 20 Old 09-11-2014, 02:37 PM Thread Starter
 
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thanks! tazandjan.
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