147 gearbox replacement, start up? - Alfa Romeo Forum
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(Post Link) post #1 of 7 Old 30-09-16 Thread Starter
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147 gearbox replacement, start up?

What is the procedure after installing another gearbox?

When you got your "new gearbox' did you just put it in and it worked?

Or do you have to calibrate before it will work ?

Don't mind if it works roughly just so i can get it moving , then i will do the calibration, waiting on the software.
How does the car know it's a different gearbox?
Need to know this.


Thanks
Cas
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I'm guessing you are referring to selespeed. No way for software to know you have new box in... Chances are the old calibration is close enough to the new box, but chances are a bit more likely it is far enough out not to work properly without re-calibration. Worth a try, but absolutely no guarantee.
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Gertie ,
that was what i was thinking.
The ECU would have no way of knowing it was a different gearbox.

Then i guess the worst case is that it that it runs like a Selespeed that needs calibration?
If luck is on your side and you put a new clutch in it won't the system revert to the setting that it was calibrated at , hopefully last clutch replacement?
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Are you changing the clutch while the gearbox is out? I would.... How about the Selespeed actuator, I guess you are moving that from the old gearbox onto the new gearbox?
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But you will need to check, and almost certainly adjust, the clutch rod to the correct length first - that is a manual task in conjunction with MES, alfadiag etc.
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Pud',

new clutch assembly.
The actuator has been lifted off the old gearbox , no disconnection at all.
The previous fault was jumping out of 3rd gear but i see now that selector detent is faulty and not locking in gear.
Gearbox is out but it did clunk in 3rd and i found the the clutch worn, as you suggested.
However Smacky said the selector post mount could be cracked which was why i went for another gearbox.

Had they put a relief in the subframe or slightly different shape it would be easier to install.
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Just driven the car on a test drive, perfect .
No calibration needed.

I do want to suggest to anyone doing this job two things.
Make a metal guard to depress the selector shaft.
There is a lug/mounting that fouls on the subframe grind the bugger off , it does nothing!

I ground it off completely and rounded the case area and the gearbox went in about 5 minutes.
This saved me about two hours time on the last one i did.

Purists will hate this but life is short.
The angle grinder can be your best friend?
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