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Posted by: Tdskip Mar 5 2020, 01:01 PM

It’s a fairly major effort to swap out the shaft on a Weber, correct?

I have a pair of 40s we are the shafts are mismatched, the other one does not have this extension on it and I need both to be the short style.

This is for the 912 but air cooled Porsche so I figured why not ask here.

Thanks!

Posted by: Root_Werks Mar 5 2020, 01:09 PM

Do you have screws or the rivets on the butterflies? To me, the screws make it easier.

Either way, it's not a small task. It's hard to remove the screws or rivets without damaging something. That's probably mostly because I don't have the proper tools.

Posted by: Tdskip Mar 5 2020, 01:31 PM

Thanks for the confirmation, appreciate the coaching.

Posted by: Root_Werks Mar 5 2020, 01:57 PM

And if you want to dump those 40's, I have a set of P11-4's bored to 44's with matching manifolds for a 356/912 engine.

Posted by: Tdskip Mar 5 2020, 02:28 PM

I have a spare set of 40s and a set of Dels, but I’ll probably mess those all up so I’ll let you know!

Thanks again

Posted by: rgalla9146 Mar 5 2020, 03:34 PM

The spring is positioned incorrectly on that carb

Posted by: Tbrown4x4 Mar 6 2020, 05:57 AM

Messing with the throttle plates is fiddly. The progression holes are drilled after the plates are installed, so changing anything around can mess up their relationship. Better to have Pierce Manifolds go through them or maybe @http://www.914world.com/bbs2/index.php?showuser=13527 .

If the relationship between the progression holes and the plates is wrong, you'll have a hard time tuning the carbs.

Also, isn't there a small nut deep in the end of that extension?

Posted by: Tdskip Mar 6 2020, 06:46 AM

Thanks for the responses.

Thanks for the eyes on the spring, how it came to me.

@http://www.914world.com/bbs2/index.php?showuser=17338 - Another member here also suggested removing a nut in that shaft opening. There isn’t on in there. Looks like Allen head fitting and you cannot rotate the shaft because it will hit the idle screw housing. Pretty sure the whole shaft needs to come out (on this one anyway).

Posted by: Tbrown4x4 Mar 6 2020, 07:48 AM

It makes sense that there isn't enough room for a regular nut. Probably a barrel nut. Put an Allen head down there and hold the shaft. You might also turn in the idle screw so the throttle plates are not touching the carb throats, and turn the Allen wrench against that.

Posted by: Tdskip Mar 6 2020, 02:39 PM

QUOTE(Tbrown4x4 @ Mar 6 2020, 07:48 AM)

Posted by: Tdskip Mar 6 2020, 03:56 PM

Checked again and just can't see a way to rotate the shaft loose as pictured - it must have the long extension assembled and then the narrow (other) side passed through.

So good for a 914, so not going to mess with it, but bad for a 912.

Posted by: Tdskip Mar 6 2020, 10:08 PM

@http://www.914world.com/bbs2/index.php?showuser=17338 - you were right.

I came back to this after re-reading your posts and it clicked. Shaft extension off, easy.

Thanks again and sorry it didn’t click.

Posted by: rhodyguy Mar 7 2020, 07:54 AM

Nice catch Todd.

Posted by: Tdskip Mar 7 2020, 08:10 AM

QUOTE(rhodyguy @ Mar 7 2020, 07:54 AM)

Posted by: Tbrown4x4 Mar 7 2020, 03:17 PM

Glad it worked out. Happy to help.

Posted by: Tdskip Mar 7 2020, 03:24 PM

Also realized, as was pointed out, the DPO wasn't using the correct spring set up so I fixed that as well and they now snap shut as they should.

Thanks!