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-   -   Shifting support fork (http://forums.pelicanparts.com/porsche-911-technical-forum/868331-shifting-support-fork.html)

Marc-André 06-03-2015 05:50 PM

Shifting support fork
 
So I'm having a few problems shifting in the 1st - 2nd gears. I've changed, the bushings (shifter, tunnel, coupling) and oil (swepco) but still no improvements... So I opened up the cover underneath the tranny, where the support fork is located. It's not loose or broken, although there seems to be a bit of wear on one side (see picture) but I doubt this is what's causing me trouble. Any ideas? Time to change the synchros?:(http://forums.pelicanparts.com/uploa...1433382605.jpg

Oh Haha 06-03-2015 05:53 PM

Looks fine to me.

Probably worn synchros if you have trouble going into 2nd from 1st.

john walker's workshop 06-03-2015 08:46 PM

As long as the swepco is out, put some kendall 80/90 in there so it will shift as well as possible.

chris_seven 06-03-2015 11:32 PM

These forks do bend and open up slightly which is easy to measure.

Any wear or bending will be seen as increased stick movement and reduction in the 'definition' of the gate, it doesn't really affect the shift as such.

I would agree with chucking the Swepco out - we use a Motul Technosynthese with good results as I can't find Kendall in the UK.

winders 06-04-2015 12:35 AM

Of course it is Swepco's fault.....:rolleyes:

chris_seven 06-04-2015 06:30 AM

Possibly :eek: - I have never much liked the shift quality of a 915 with Swepco.

Matt Monson 06-04-2015 06:38 AM

At what rpm do you make your 1-2 shift?

Josh D 06-04-2015 07:33 AM

Looks like classic gear contact due to output shaft walking. This happens when there is significant wear on the 4 point bearing and/or the bearing retainer.

sc_rufctr 06-04-2015 03:25 PM

Quote:

Originally Posted by Marc-André (Post 8651058)
So I'm having a few problems shifting in the 1st - 2nd gears. I've changed, the bushings (shifter, tunnel, coupling) and oil (swepco) but still no improvements... So I opened up the cover underneath the tranny, where the support fork is located. It's not loose or broken, although there seems to be a bit of wear on one side (see picture) but I doubt this is what's causing me trouble. Any ideas? Time to change the synchros?:(http://forums.pelicanparts.com/uploa...1433382605.jpg

It's interesting that your shift fork plate looks a lot like mine.

Here's mine... Note the sealant and I had broken studs when I took it out.
Please double check yours.

http://forums.pelicanparts.com/uploa...1433460313.jpg

Marc-André 06-04-2015 04:51 PM

Quote:

Originally Posted by Matt Monson (Post 8651622)
At what rpm do you make your 1-2 shift?

Upshift usually is around 4K RPM, downshift is about 1K I guess...

Marc-André 06-04-2015 04:56 PM

So far Swepco 0 - Kendall 4 !!

As for my studs, I haven't taken them apart since the fork seems well secured to the cover.

djb25 06-05-2015 04:48 AM

Quote:

Originally Posted by chris_seven (Post 8651344)
These forks do bend and open up slightly which is easy to measure.

Any wear or bending will be seen as increased stick movement and reduction in the 'definition' of the gate, it doesn't really affect the shift as such.

I would agree with chucking the Swepco out - we use a Motul Technosynthese with good results as I can't find Kendall in the UK.

Where would I find the correct dimensions?

john walker's workshop 06-05-2015 05:20 AM

Measure inside the fork at the bottom and see if the top is the same.

djb25 06-05-2015 07:55 AM

Quote:

Originally Posted by john walker's workshop (Post 8653059)
Measure inside the fork at the bottom and see if the top is the same.

Well, that makes me look like a damn idiot, doesn't it?

So it should be fairly consistent from top to bottom?


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