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I have an old Opel Kadett KJ 1938 and this part of the carburetor broke:

enter image description here

I think it's supposed to be the needle or the float valve. You can see clearly that this part is broken. How could I fix this?

EDIT (by Pᴀᴜʟsᴛᴇʀ2):

In case anyone is wondering, this is what it should look like regularly:

enter image description here enter image description here

1 Answer 1


That is the top of the float bowl.. there should be like a triangular shaped cap and I assume seal on there with a bolt or filler type jet going through the centre holding it in place. You could try a bolt with the same thread, but you'll have to find an alternative way of sealing it without that cap. And this is assuming it's not some special fluted bolt etc.

I could only find this weird video of the same type of carb.. but it does show what fits there a bit more clearly.


  • Yes, a Opel P4. I think both of the cars has the same engine. I could replace this part of the carburetor, but the problem is where to find another carburetor like this. The car is in a mechanic workshop, but it doesn't seem they are competent to handle this (due it's age).
    – Jazzguy
    Mar 14, 2017 at 12:59
  • It that bolt and cap don't actually control fuel flow (I'm not sure you see) or control float height, you could likely just plug and see what effect it has. As I say though if it's some sort of fuel/float control your going to need the correct part, or have one machined.
    – Orb
    Mar 14, 2017 at 13:05
  • Why don't you source a simple carburettor from a similar sized engine and make some adaptor plates to make it fit? Or, are you trying for a "factory standard" re-build?
    – Solar Mike
    Mar 15, 2017 at 8:42
  • @Orb "It that bolt and cap don't actually control fuel flow (I'm not sure you see) or control float height" - I I thought the same thing, but why this part broke?
    – Jazzguy
    Mar 15, 2017 at 14:28
  • @SolarMike, almost 100% of the car is original, so I won't change for a new carburetor and I don't think is necessary to replace for another one.
    – Jazzguy
    Mar 15, 2017 at 14:29

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