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Lars E · Posted: Mon Feb 15, 2010 1:16 pm Post subject: Gear box adjustment

Hello snails.
I'm making a new gearbox for the orange 2CV, and now I come to that I should have adjusted the crown wheel.
In my Haynes manual says that you must let professionals do, but I never imagined, is of course a mechanic so I have a plan to make it myself.

There is an easy way to do it??
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Mvh. Lars E
2cv 0,6Tii special

backfire · Posted: Mon Feb 15, 2010 1:37 pm Post subject:

Not that I know of, you have to measure and adjust 2 shafts, that makes it a little time consuming. You could use blue ink (pruisisch blue) used to make visible where the gears touch each other. And that is most important for a long life. But maybe some mechanich building 2cv racers knows a simple sollution,I can imagine that they have to rebuild gearbox more then once.
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2CV, with Visa turbo charged

JoZeF · Grave Digger Joined: 25 May 2007 Posts: 1734

Clôd changed his on the side of the road Laughing

Didn't make a clean repair, but it worked.

I think he has Citroen garage manual, maybe he could scan the relevant pages ?
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O.E.

Clôd · Posted: Mon Feb 15, 2010 2:55 pm Post subject:

Well, my Citroen garage repair manual will not tell much more than Haynes manual I guess... And my manual is for early Ami 6 AM engines and gearboxes ...
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dyanut · Posted: Mon Feb 15, 2010 9:11 pm Post subject:

Lars,
I understand that you have been using a Dyane gearbox and weren't too
happy about that big gap between 3rd and 4th gear, which was why you
decided to rebuild a 2CV gearbox.

Maybe too late now, but for a fast road car, mixing the 8/31 Dyane/Ami
pinion and crown wheel pair with the 2CV's gearbox cluster gives a nice
'high(er) ratio' gearbox.

If the original Dyane gearbox casing is retained, there's no need to reset
the depth of mesh of the pinion, so it's only necessary to adjust the
backlash between the crownwheel and pinion using a dial gauge.

Even then, I still like to go 'back to basics' for a final check on the tooth
contact pattern, as described here on pages 412 & 413...
< http://books.google.co.uk/books?id=eL6TBaSnd78C&pg=PA411&lpg=PA411&dq=adjusting+crown+wheel+and+pinion+mesh&source=bl&ots=h9Y7YO_Nxv&sig=dPXHGGa8XiPHeE3onOnsHHIaH5Y&hl=en&ei=fZF5S63zEISM0gTTw-y0CQ&sa=X&oi=book_result&ct=result&resnum=1&ved=0CAYQ6AEwADgK#v=onepage&q=adjusting%20crown%20wheel%20and%20pinion%20mesh&f=false >

ken.

JuanNavarro · Posted: Wed Feb 17, 2010 1:52 am Post subject:

The thing is that you may need some special tooling, a micrometer and a set of calibrated washers but here is the repair manual (in spanish Cool

)
http://www.2cvsalamanca.com/manuald/imagepag/image73.html this page and next
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backfire · Posted: Wed Feb 17, 2010 11:57 am Post subject:

Hi Lars, as you can see on the page 413 the pictures with the contact area. The pruisisch blauw, the blue ink, you can see where the teeth touch each other. If I am not mistaken then measure the amount of mm how much the contact area should move and divide this by 7. This should give you the extra thickness you need to ad to the shims. The only disadvantgae of this system is, is that you have to completely build the gearbox, take is apart and do this untill you are happy with the contact area.
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2CV, with Visa turbo charged

Lars E · Posted: Wed Feb 17, 2010 3:39 pm Post subject:

Ok, super. I'll just adjust to it, thanks for your help.
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Mvh. Lars E
2cv 0,6Tii special

Lars E · Posted: Thu Feb 25, 2010 1:06 pm Post subject:

Hello snails, so now I am finist assemble and adjust the gearbox.
Do not know exactly where the parts come from, but now I have the following gear.

4. gear 5,1/1
3. gear 6,85/1
2. gear 10,2/1
1. gear 20/1
(this is the total gearing, from engine to driveshaft)
It will be exciting for the summer to get out and run with it
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Mvh. Lars E
2cv 0,6Tii special

ZexGrieri · Posted: Sun Oct 02, 2011 6:04 am Post subject: Gear box adjustment

I have this design on the gear box for my old Star G36. I still have to remove the gearbox from the frame to access the spring guide but I could see how access on the AR platform would be simple.
Its about time.
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