Zenith 35/40 INAT parts? - PeachParts Mercedes-Benz Forum

Karsten · #1 04-10-2006, 10:59 AM

I need to do a bit of work on these carbs.
First of all the actuating levers are worn in the bushings so the lever has pushed off the locking ring and thereby the spring from the float bowl vent valve. Furthermore it is not so good since it will make it difficult to syncronize the carbs.

I was careless enough to ask MB for the cost of these......which is more than I'm prepared to pay.

I'm looking for a good place to purchase these parts and also a rebuild kit?

It seems like BMW used the same carbs on some models, are the spareparts compatible with the 220Sb version?

Karsten

Karsten · #2 04-10-2006, 03:51 PM

He, I found a way to solve the "worn down bushing problem" in the actuating lever using a little sealed double ball bearing assembly. I'll have to make a little special bolt to replace the "pin part" of the bushing assembly and glue a little flange to the actuating lever instead of the female part of the bushing. It seems very doable, especially since the original spare parts are 500 USD for a set!!!

I'll post some pictures of the solution after the first lever is completed.

Karsten

autozen · #3 04-11-2006, 10:52 AM

I may have some parts for the zeniths collecting dust in one of my parts bins from yesteryear. I'll check. I can scan a chart of where all the jets go if you need it. Those are simple and beautiful carbs in my opinion. Many say they are pieces of junk and install Webers, but that is because they don't know how to set them up. There are three key points. Tighten the tiny spring in the starterdeckle, choke cover, set prethrottle gap correctly, and set high speed hot idle so connecting rod snaps in tension free. If you get these 3 items right, I guarantee you will be able to get into a cold car, touch the pedal once, fire the engine, and back out of the garage with an auto trans without the engine dieing. Good luck.

Karsten · #4 04-11-2006, 02:07 PM

Thanks for your reply. It would be nice if you are able to find some Zenith parts.

Generally speaking the Zenits has done a fine job for me, so I have no plans of swapping them out.

Karsten

Karsten · #5 04-21-2006, 09:22 AM

Still trying to find a carb rebuild kit for my W111 220Sb. There are plenty of kits for this carb but they are all stated to fit the 230, 250 or BMW.

I think it would be possible to use one of these kits with my carbs, but I'm not sure about the actual differences in the carb design other than some emission control features were added later. The basic design looks the same.

Could anyone tell me which problem it would give to use the slightly newer kit for the 230 carb version?

Karsten

autozen · #6 04-21-2006, 02:02 PM

Karsten,
Sorry I haven't been able to see what I still have, but I've been busy putting out fires on several fronts. You don't really need any kits. All you usualy need is a few individual gaskets. You need a gasket between the air horn and jet boby, a gasket between the jet body and float bowel assy, and possibly a gasket to create vacuum for pre throttle gap. Nothing goes wrong with the jets and emulsion tubes. Gotta run. Catch you this weekend.

ctaylor738 · #7 04-22-2006, 09:21 AM

Most of the kits come with several slightly different gaskets for the top and fuel block to accomodate the slight differences between models. I have some left over if you want them - send me an email.

There is a sort of strange website - ruddies-berlin that has a lot of stuff for Zenith and Solex.

Karsten · #8 04-23-2006, 09:16 AM

Thanks, I'll send you a PM.

Yes I did find the Ruddies-Berlin site, only problem is that I'll have to write him in German and although I sort-of speak German my writing is a bit rusty

Karsten

Quote:

Originally Posted by ctaylor738

Most of the kits come with several slightly different gaskets for the top and fuel block to accomodate the slight differences between models. I have some left over if you want them - send me an email.

There is a sort of strange website - ruddies-berlin that has a lot of stuff for Zenith and Solex.

cth350 · #9 04-23-2006, 12:27 PM

The zenith kits you found should have all the gaskets you need. And last I checked, extra gaskets are a few bucks each from the dealer. You will want to get acceleration pumps. These days, the kits only have a little plastic skirt for them rather than the complete pump.

Your best source for spare parts is a used set of carbs. They appear on ebay "all the time". Some times, they're only 10$/carb. Other times, it's 100$/carb. There is neither rhyme nor reason to it.

-CTH

Karsten · #10 04-23-2006, 05:43 PM

Hi Charles,

I do have spare carbs and actually just pulled an extra set from a parts car today. Also because I need an exhaust manifold with a working preheat valve. The shaft for this is unfortunately not available from MB anymore.

Is the pump prone to wear? It appears to look okay. I'm considering testing the pump volume using kerosine (more friendly aroma). The piston seal is from "leather like" material with a spring inside.

The car has relatively low milage, around 75k miles.

How is your 600 project going?

Karsten

cth350 · #11 04-24-2006, 07:13 AM

The 600 hasn't gone anywhere for year. No time.

They had the shafts 2 years ago. I got a pair from benz. Had to be special ordered from Germany. Took quite a while to get. Never did the work once the machinst told me how much work it was going to be for him to remove the frozen one. That pariticular car wasn't worth it.

Come to think of it, I have no clue where those shafts wound up. -CTH

Karsten · #12 04-24-2006, 09:06 AM

Quote:

Originally Posted by cth350

The 600 hasn't gone anywhere for year. No time.

I know the situation, too many cars too little time

Well it is nice to have something to do when we retire....eventually...

Quote:

Originally Posted by cth350

They had the shafts 2 years ago. I got a pair from benz. Had to be special ordered from Germany. Took quite a while to get. Never did the work once the machinst told me how much work it was going to be for him to remove the frozen one. That pariticular car wasn't worth it.

Come to think of it, I have no clue where those shafts wound up. -CTH

An acethylene torch or plasma cutter will have a frozen valve out in no time, I can't see this should be a big problem.

If you find the shafts and wish to part with them, please let me know. Meanwhile I did manage to free up the valve on the third manifold I tried. There is quite a bit of play in the bushings but it will work for now.

Karsten

autozen · #13 04-24-2006, 11:04 AM

Quote:

Originally Posted by Karsten

I know the situation, too many cars too little time

Well it is nice to have something to do when we retire....eventually...

An acethylene torch or plasma cutter will have a frozen valve out in no time, I can't see this should be a big problem.

If you find the shafts and wish to part with them, please let me know. Meanwhile I did manage to free up the valve on the third manifold I tried. There is quite a bit of play in the bushings but it will work for now.

Karsten

I'm not sure I'm totally following this thread, but if I understand correctly, you are going to use a smoke wrench to remove valves from a head. I wouldn't advise the procedure on MB exhaust, because they are sodium filled and become violent when open.

Also is someone looking for cam shafts for a 6.3 liter MB, because I have a brand new pair.

autozen · #14 04-24-2006, 11:07 AM

Never mind. I'm running late and didn't read thouroghly. I just reread the posts.

Karsten · #15 04-28-2006, 08:04 AM

Cleaning these carbs revealed some "red oil" inside the chamber which seems to be originally made for a second stage accelerator pump. This is not fitted on this model so the chamber seems to have no real function. It was the same on both carbs. How did that oil get there and should it be there?

Karsten