Zenith 35/40

1961-1968: a.k.a "Finnie" or "Heckflosse" models
190, 190D, 200, 200D, 220b, 220Sb, 220SEb, 230, 230S, 250SE coupe, 280SE coupe, 280SE 3.5 coupe, 220SEb cabrio., 250SE conv., 280SE cabrio., 280SE 3.5 Cabrio., 300SE, 300SE coupe, 300SE conv., 300SEL
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Joined: Thu 27 Oct, 2016 8:35 am
Model you own: w111
Location: Brisbane, QLD

Zenith 35/40

Post by dynamike » Fri 12 Jan, 2018 10:59 am

I've been researching my Zenith carburetors and thought I share some of the more useful information I curated:


English Manual - Jaime Kop (as per Drew's Finnie bible)


Extensive GERMAN literature and step-by-step guides - Strich Acht ForumImage
http://www.strichacht-forum.de/knowhow- ... INAT_35/40 including:


The Zenith Carburetor Explained
The Zenith Carburetor Adjustments Basics
The Zenith Carburetor Adjustments part 1 of 2
The Zenith Carburetor Adjustments part 1 of 2

Common issues:
The pre 1972 models have a fuel return valve to avoid vapor locks. The diaphragm within the assembly starts to leak over time due to wear. Whilst some people in colder climates (particularly Germany) apparently have success with simply closing it off using a 2 cent piece it's not recommended. The valve assembly is hard to come by and goes for upwards of $200. However, you can get the diaphragm (154) and two fibre washer (155) which should fix this issue. Ensure the gap is set correctly as per http://www.jaimekop.com/CarbManual/Page28-29/index.html


Rebuilt Kit
Fibre washer within fuel return valve that is known to leak due to worn diaphram

And, of course, always worth checking with the forum sponsor for availability of parts.

1965 220 Sb Sedan
1962 220Seb Sedan (stripped for parts)

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300 SLR
Posts: 1937
Joined: Fri 10 Oct, 2008 12:10 am
Model you own: w111
Location: Perth WA

Re: Zenith 35/40

Post by Bartman4800 » Fri 12 Jan, 2018 12:12 pm

Good stuff!

This should go in the library

1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)

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