DC-7 Linkert

[dukekleman]

I'm servicing a DC-7 Linkert carburetor for the second owner of a original 1966 FL.
Overall the carburetor is in pretty nice condition for having over 65,000 original miles on it.
IMG_20260117_111853958.jpg
The threads on the bowl were damaged. Over years of service, this unfortunately can occur. When this happens, it creates an annoying and dangerous fuel leak.

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After a bath in the Ultrasonic cleaner, things cleaned up nicely on the air cleaner inlet side of the fuel system.
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As well as the carburetor body parts.
One thing to remember and take notice of is the installation of the throttle disc. It is directional. This one, like many was installed incorrectly. To insure proper fuel delivery and transition, be sure to verify it's orientation upon installing it.

Hope this helps,

Duke Kleman

[T. Cotten]

Can you tell us, Duke,

What is the difference between a DC 9/A disc and a common 9/X?

9ADISC.jpg

9ºdiscs.jpg

I really couldn't find any!

Is the bore really different? Thanks..

....Cotten

[dukekleman]

Cotton,

The DC-7 Linkert is referred to as a 1.375 Bore using a throttle disc labeled as a 9A. This disc measures 1.492" on the "X" axis, parallel with the throttle shaft.

The M74B Linkert is referred to as a 1.500 Bore using a throttle disc labeled as a 9X. This disc measures 1.557" on the "X" axis, parallel with the throttle shaft.

Below is an image of the DC-7 9A throttle disc placed over top the M74B 9X throttle disc.
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Another close up photo of the bevel on each disc. The top bevel shown is of the 9A disc for the DC-7 carburetor
IMG_20260118_131656586.jpg

I hope this helps,

Duke Kleman

[T. Cotten]

So it is indeed smaller, Duke?

Unfortunately, I have have no samples handy to measure, but,..
The nominal 1½" Models had a 1.5625" bore;so your disc has typical clearance.

An actual 1 3/8" bore would be a hair less than 35mm, but 1.492" sounds like it was the full one and a half.

(I never was required to fit a fresh disc, as the cast iron housing not only resisted wear far better than bronze, the machines rarely saw the decades/mileage of service that earlier models suffered. Thus, in my opinion, the DC was not only the pinnacle of the DLX design evolution, it was the first truly modern production American carburetor.
They rarely required more then disassembly, cleaning, and reassembly.)

...Cotten
PS: A caveat on requirements: How many points do the judges deduct if it doesn't have the yellow Henkel Alodine iridescent finiish?

DCYELLOW.jpg
Note how it survived better than the cad in spots.