New needle sticking

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rednax
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New needle sticking

Postby rednax » Mon Dec 14, 2020 9:29 pm

I'm rebuilding a zenith 68 and I put the new needle and seat and the needle was sticking. There's a little clip (pictured) which I think is supposed to hold the float to the needle. The problem is that the clip doesn't fit. The rebuild kit is from hamiltonbobs.
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the clip
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outdoors4evr
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Re: New needle sticking

Postby outdoors4evr » Tue Dec 15, 2020 8:01 am

Bend the clip to fit the needle. The clip should sit in the groove of the needle with a pretty sloppy fit. (able to move generously)
If the needle has a Viton tip, you may want to find another needle that is all metal.
The Viton Tipped needles have a habit of getting sticky.
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rednax
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Re: New needle sticking

Postby rednax » Thu Dec 17, 2020 4:02 pm

Is the pin the correct way and am I supposed to attach it to the float? Sorry about the photo being out of focus
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Eugene
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Re: New needle sticking

Postby Eugene » Thu Dec 17, 2020 5:02 pm

The pin fits over the float near the anchor pin. So that when the float drops, the pin pulls the needle valve down.
I have an excuse. CRS.

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Re: New needle sticking

Postby john2189 » Thu Dec 17, 2020 8:20 pm

The clip didn’t fit mine either. Carb didn’t have one when I took it apart. So I put it together with out it. Runs great, no problem.
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rednax
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Location: Michigan

Re: New needle sticking

Postby rednax » Thu Dec 17, 2020 9:10 pm

Yeah, mine's got a tab that sticks out and it didn't have a clip before. I'm going to try to bend the clip around the float because the needle's sticking, but maybe I'll leave it off and see how it works.
Last edited by rednax on Thu Dec 17, 2020 9:53 pm, edited 1 time in total.
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Eugene
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Re: New needle sticking

Postby Eugene » Thu Dec 17, 2020 9:38 pm

To prevent the needle valve from sticking in the seat, shut off the fuel, let the carburetor run dry, then shut off the ignition.
I have an excuse. CRS.

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Re: New needle sticking

Postby feg7846 » Thu Dec 17, 2020 9:44 pm

I have not had good luck with the new Viton tipped needle valves. The last few Farmall cub carbs that I have rebuilt, I used the old needle valve and not the new Viton tips. The first time that I used the new tips, it liked to run me crazy. I know I was doing everything rights, but finally narrowed it down to the new tips.

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Don McCombs
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Re: New needle sticking

Postby Don McCombs » Thu Dec 17, 2020 10:49 pm

rednax wrote:Yeah, mine's got a tab that sticks out and it didn't have a clip before. I'm going to try to bend the clip around the float because the needle's sticking, but maybe I'll leave it off and see how it works.

Use the old needle.
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rednax
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Re: New needle sticking

Postby rednax » Fri Dec 18, 2020 8:57 am

The old needle also has a viton tip. Is there a place that sells metal needles for these carburetors?
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Don McCombs
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Re: New needle sticking

Postby Don McCombs » Fri Dec 18, 2020 9:12 am

You could check with Morgan at McDonald Carb & Ignition.
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rednax
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Re: New needle sticking

Postby rednax » Fri Dec 18, 2020 3:29 pm

I put the carburetor back on and found where it was leaking. It looks like a plug made of a bunch of little rods. I don't see it on the parts diagram. Should I cover it up with JB weld? It ran really rough with the choke on.
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Re: New needle sticking

Postby Dale Finch » Fri Dec 18, 2020 5:00 pm

No, don't block that up. It is doing its job, by draining the fuel that the updraft carb draws up when you are trying to start the engine. If it does not start, that fuel needs to drain back out.

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Don McCombs
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Re: New needle sticking

Postby Don McCombs » Fri Dec 18, 2020 5:21 pm

Dale is absolutely correct.
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Re: New needle sticking

Postby Gary Dotson » Sat Dec 19, 2020 8:28 am

There are basically 3 locations, in these carbs, where a leak may occur. No. 1 is, of course, is a non-sealing needle and seat, we've all experienced that. No.2 is the gasket under the needle seat. If the pot metal surface is rough, the gasket may not seal. No.3 is the gasket under the fuel discharge tube, the same reason as No.2. The fuel level in the carb. is higher than the base of that tube and fuel in the metering well will leak, if the gasket does not seal. In all of these cases, the fuel will drain out through the sintered drain filter circled in your picture.


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