? re: idle mix adjustment on 2150 2V carb - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-18-2005, 07:38 PM
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? re: idle mix adjustment on 2150 2V carb

This is my first experience with the Ford 2150 2V carb and I can't figure out how to turn the idle mix adjustment screws. They have what I think they call an "idle limiter cap" on the end of each screw. These caps feel like they are spring loaded (you can move them and feel the spring pressure). How, exactly, do you turn the idle adjustment screws with these caps on them?

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Old 07-18-2005, 08:39 PM
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If the caps are plastic, just pull them off with some needle nose pliers. They can be tough to get off too! If the carb is still off, its pretty easy to cut the cap with a knife or side cutters and then pull them off.

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Old 07-18-2005, 10:31 PM
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Unfortunately, the carb is back on the manifold - so they are pretty difficult to get at. Mine appear to be metal and are about the diameter of a nickel. Is there a regular screw head under there if I pry it off? And is there supposed to be a way to adjust the screws with these caps still in place? What the heck is the theory behind these caps anyhow?
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Old 07-18-2005, 11:47 PM
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Quote:
Originally Posted by cboy
Mine appear to be metal and are about the diameter of a nickel. Is there a regular screw head under there if I pry it off? And is there supposed to be a way to adjust the screws with these caps still in place? What the heck is the theory behind these caps anyhow?
Your style is a two piece sheet metal cup arrangement. There is an inner and outer cup. They snap together. The locking tang is on the outer cup and it snaps into the inner cup. Once the inner cup is removed, competely screw out the mixture screw and you can remove the inner cup.

The idea of this (and the previousy mentioned plastic cap) is to not allow field idle mixture adjustments on an emissions carburetor.

Oh...Do not try and pry them off as it will most likely damage the idle mixture adjustment screws.

Last edited by KULTULZ; 07-18-2005 at 11:53 PM.
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Old 07-19-2005, 06:56 AM
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Originally Posted by KULTULZ
Oh...Do not try and pry them off as it will most likely damage the idle mixture adjustment screws.
Thanks Kultulz, as usual, you come through on the Ford questions. Do you recommend pulling the carb off to tackle this or is there a way to find the tangs and remove the outer cap while the carb is still on the manifold.
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Old 07-19-2005, 12:16 PM
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It would be easier I suppose to remove the carb as you are not quite sure what you are looking at yet. I have an illustration, but am too damn lazy to get my scanner repaired.

It is similiar to two thimbles. The outer piece slides into the inner piece and is retained by two small tabs on the outer piece that slips into two holes in the inner piece.

Now if that makes any sense, you are brighter than I am...

FORD actually made special service tools to remove the caps (this style and the plastic) for field adjustment. It was a punch with a small slide hammer.

If for some reason you do bend the adjustment screws, use a set from an old 2100/2150/4100.
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Old 07-19-2005, 05:31 PM
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Thanks for the response Kultulz...but after my last post I went out to the shop and just pulled the carb. I'm glad I did because I don't think I could have figured out how to get those little buggers off any other way.
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