Weber 32 ADFA rebuilding question

[KLC356]

I have a rebuild kit but there are no detailed instructions on where parts go.
I have a blow up of carb and part list.
Can anyone tell me the diagram # for A, B, C, D and F I marked on paper. I can identify other items.


Here is chart


Here is list


I am not sure if other kits had better instructions but hopefully someone can help. Otherwise I’ll try to match up pieces as I pull it apart.

Thank you

[PaulC]

C are the three throttle shaft bushings labeled 38, 44, and 36.

B I believe is the gasket for the needle valve in the bowl, #8 most likely

D, E and F are o-rings used in various places. I had the same issue identifying them when I was rebuilding an ADHA. One for sure is the o-ring #61 for the mixture screw #60.

A I believe is the gasket #88 for the auto choke bolt #89. I didn't use this because I couldn't remove the bolt and was afraid of breaking it off. It wasn't leaking water anyway so it really didn't matter.

Might help to note the part numbers on the list - all the o-rings start with 41565. So by my count there are two .001s, one .002, two .008s and two .010s.

I had to wait until I disassembled something with an o-ring so I could match the size.
Pierce manifolds lists seven different 41565 o-rings but unfortunately not the size.
Hope this is of some help.

[KLC356]

Thank you for responding.

I was working on it last night and was stuck on size for mixture screw. The largest o ring was too big. The middle size did fit but I was unsure if the smaller size would be a tighter fit. And there are 2 notches on screw where it could fit. My old o ring was broken when I removed screw so I could not tell where it was seated. I am going with notch closer to threads instead of the one above it and middle size o ring.

I did get the needle valve one figured out.

Did you remove shafts? I am not sure if I should go to that level. There are some tab washers that were not included with kit at end of shaft that I’m not sure I could reuse(?) if you did - how did you tackle it.

I am surprised this is not documented somewhere or step by step listed.

Thank you

[PaulC]

The shafts can be removed if you first remove the throttle valves. Just be sure to use a well fitting screwdriver. The tabbed washers can be reused, just bend the tab enough to let the nut turn.

I did a whole write-up when I rebuilt an ADHA but I'm not sure how to post it here.
If I can figure it out I'll add it.

[PaulC]

In the meantime If you do decide to remove the shafts, take lots of pictures of how the parts are assembled first. That way you can get all the springs and other parts back in the correct orientation.

Once the throttle valves are off and other parts removed, the shafts can be tapped out with a small hammer. The seals just press into the casting but note the orientation before removing the old ones.

[PaulC]

As promised a link to my ADHA rebuild write-up:
https://drive.google.com/open?id=1DLaHY ... LPJhnPPROL

[KLC356]

This is amazing.

I was looking for something EXACTLY like this document. Thank you. I can finish up rebuild now.

[wetminkey]

I would also like to thank PaulC for posting this link!
My ADHA is on my workbench right now, and I have been threatening to post a rebuilding thread.
I'll just post up anything I observe, or find, different. My Fiat Shop Manual refers to the carb as a 28/32 ADHA (I've decided that it means "A Dozen and a Half Addons"), due to the size of it's primary, and secondary bores. The manual also gives a full step-by-step of the tuning procedures,...
Best of luck with your rebuild! I hope I can keep warm enough to complete mine! I'll bring it inside once the carb cleaner is rinsed off,...
Thank you again, very much!
Todd.

[wetminkey]

And I'd like to add this link to this thread.
Pierce Manifolds Exploded Diagram 28/32 ADHA and parts list:
https://www.piercemanifolds.com/category_s/226.htm
That way this thread will contain all the info necessary to rebuild the carb, and with a info/parts source,...
Todd.

[wetminkey]

Question. I believe that the main jet resides behind the power valve housing and diaphragm. Is this part not removed and cleaned? Must not be replaced,...
I do not see that in the rebuild thread, and mine turns, but does not seem to back out,...
Also, mine is "28/32 ADHA 4/179 8M". Stamped on bottom flange of main housing.
Mine is missing it's filter screen and the amount of crap in the bowl (and the fact that I'm having to rebuild it) is a result. I've got a nice external filter now,...
Anyone know about the main jet?
Todd.

[PaulC]

Looks like 18 is the main jet. Must have missed that, but I did blow out all passages and jets so I probably hit that one too. From the PM page looks like it's threaded in, so it should unscrew?

[wetminkey]

Yeah, I've seen the replacement part,...
Mine turns, but doesn't back out,...it's tight. I chose to stop, rather than continue.
Since I have no replacement, and there's none in the rebuild kit, I'll leave it. Carb cleaner will get into that area via the opening in the carb bowl,...I'll just replace the diaphragm.
I have the whole thing laid out, disassembled, right now,...so I'll get a pic before I throw it all in cleaner.
Thanks again, PaulC!

[wetminkey]

So,...if I'm correct, Kevin's 32 ADFA is a similar carb without several of the ADHA's addons.
I know that most rebuild kits are quite simple (with just a few replacement parts) and are designed to service both the ADFA and ADHA carbs.
I had to purchase a few extra diaphragms for the ADHA addons to have all the diaphragms I would need to rebuild this carb. And I had to source some replacements for the 'two hole' throttleplate gaskets because they did not come in my rebuild kit. Sounds like one of these paper 'two hole' gaskets should be used on either side of the phenolic spacer under the main carb body,...
I'll have to check to see what I've got for a carb/manifold gasket,...seems like it's thick,...
Anyway, these Weber carbs are quite similar,...ADHA must have been an adaptation to higher emissions standards,...
Todd.

[wetminkey]

Here's my 28/32 ADHA carb disassembled:

Notes: Strainer was missing. I was unable to remove the main jet (springy ball bearing entrapped in brass housing), under the power valve housing. Missing the gaskets, either side of the phenolic spacer. Some of the auxiliaries are not disassembled yet in the picture.
I also question my carb to manifold gasket,...how thick should it be? Mine looks like a reused phenolic spacer,...but I guess it shouldn't have a bunch of holes in it!
Cleaning/rinsing in progress,...
If only you knew the history,...I wonder how many air filters burnt up and went down this carburetor?
Todd.

[KLC356]

Ok- I messed up and did not take a before picture . Did I reassemble this correctly?