engine and drivetrain Weber 32/36 Choke Shaft "bushings" ??

[im3crazy]

Im rebuilding my 32/36 and discoverd that my choke shaft binds badly due to the shaft gouging the holes way out of round.  Bushings seem to be the way to go, but I've not found any references to this fix.  Any thoughts on correcting these??  Thanks.

['76mintgrün'02]

Many hardware stores sell bronze flange(d) bushings in a variety of sizes.  You might find one with the proper ID to fit the shaft and trim the length to suit your needs.  A smaller ID will be easy to drill out as well.  You could also trim off the extra OD, if needed, and then epoxy them in with JBweld.  Alignment will be a concern, so maybe let the glue set with them in the closed position.  I have had good luck modifying bronze bushings using a hand drill and a wooden dowel.  I put a slight taper on a dowel (slightly larger than the ID) and pushed it on snug, then spun it against a smooth surface to true it up, before "machining" it.  Let the extra epoxy spooge out and clean it up with a knife when it gets rubbery hard.  Make sure the surfaces are very clean and slightly scuffed prior to gluing.  Leave enough room to achieve alignment and let the epoxy fill the void.  Maybe "crazy", but that is what I would be tempted to try.  

[im3crazy]

Great approach. I'm used to using the JB weld and think this would allow a "soft" fit up with the bushings & shaft in place to make sure it doesn't bind. Thanks.

['76mintgrün'02]

you're welcome

 

I hope it works

[peterschop]

I wonder how worn the shafts are?

[im3crazy]

I haven't mic'd them yet, but they don't appear worn anywhere near the carb body. As expected, the most shaft wear is on the lever side. The accelerator pump lever is also badly grooved where it contacts the main shaft cam lobe (which is also obviously worn).

[Guest_anonymous]

Just scrap the whole choke mechanism and call it good

[im3crazy]

Because it gets cold here I don't want to dump the whole setup.  I have a manual choke on my Power Wagon which is foolproof and thought of going to a manual choke setup.  Problem is that the butterflies bind because of the out-of-round holes.

[TobyB]

Buy a new shaft, and find someone who really rebuilds carbs.  Around here, it's Autosport- Jonnie will redrill and bush them out.

 

Or buy another carb- it's a $300 option, and rebushing may run to half that.  Especially since your main shaft will probably be pretty oval too.

 

t

[Rocan]

I could potentially do the work for you... re-drilling and making new bushings for carbs should be a piece of cake. I have a lathe and other equipment and can properly repair the holes by JB-welding them shut and re-drilling the holes so they are no longer slotted.

 

The reason you don't weld them is because welding warps the barrels and requires honing the barrels and other work afterward; really not worth the hassle. 

 

 

Post pictures of the whole assembly, including the shafts. PM me regarding having me do the work.

Edited April 13, 2014 by Rocan