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Automatic Choke Problem
Posted by: jimrob ()
Date: June 05, 2017 11:08AM

I have a '64 Monza that I am working on. On an 80 degree day the right side choke rod position holds the choke valve plate completely open. I understand that it should hold the choke valve closed. The automatic choke rod did not seem to be correct so I ordered a new one from Clarks. Still holds the choke valve full open. If I attempt to unscrew the rod from the threaded connector it comes all the way out before it becomes high enough to reach the point it should reach. The choke coil appears to have a good "spring" action. Do I need to replace the choke coil? If so, how do I access it to replace it? :doh:

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Re: Automatic Choke Problem
Posted by: Timothy Shortle ()
Date: June 05, 2017 11:24AM

Is your rod or linkage bent? You should be able to compare it to the one on the left side. Does the butterfly (valve) move freely with the rod disconnected?

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Re: Automatic Choke Problem
Posted by: RobertC ()
Date: June 05, 2017 11:25AM

What is the height of the threaded tube the rod goes in?

When cold (choke set), mine is about 1" above the sheet metal.

I think the tube is threaded on both ends, but not sure.

To change the choke coil you need to remove the lower shroud. The coil is held by a "stud" that needs to be twisted out.

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Re: Automatic Choke Problem
Posted by: jjohnsonjo ()
Date: June 05, 2017 12:14PM

The shop manual tells you the best way to remove it, But I doubt the coil is bad.

J.O.

65 Corsa Turbo Vert
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69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

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Re: Automatic Choke Problem
Posted by: MattNall ()
Date: June 05, 2017 12:18PM

We recently had a Topic on this.... there are different length threaded tubes

IIRC





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Re: Automatic Choke Problem
Posted by: MattNall ()
Date: June 05, 2017 12:23PM

[corvaircenter.com]





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Automatic Choke Problem
Posted by: JimBrandberg ()
Date: June 06, 2017 04:49AM

Sometimes the rod coming up through the head is off to the side and dragging against the head so it's not free to operate like when it's properly centered in the hole.
Sometimes there's some other restriction in the linkage on the carburetor, something bent or misaligned.
Sometimes the wrong clip is on the link to the carburetor, the one for the accelerator pump is the wrong direction. I have lots of the AP ones but always run short of the choke ones and have to buy the slightly too big ones from Clarks.
Sometimes the lower shroud has been removed and the little screwy rivet doesn't hold the choke bracket in place without the shroud bolt too.
It's harly ever something wrong with the spring or the female coming up through the head unless the upper rod has broken off in there.
Just my 2 cents worth and I could be wrong or lacking knowledge. I learn and forget all the time.
Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: Automatic Choke Problem
Posted by: jimrob ()
Date: June 06, 2017 03:15PM

I replaced the old rod with a new one.

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Re: Automatic Choke Problem
Posted by: jimrob ()
Date: June 06, 2017 03:16PM

The female threaded part does not come up past the sheet metal at all. It is about 1/8" down below it.

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Re: Automatic Choke Problem
Posted by: jimrob ()
Date: June 06, 2017 03:18PM

According to Clarks, both sides are identical.

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Re: Automatic Choke Problem
Posted by: jimrob ()
Date: June 06, 2017 03:24PM

Thanks Jim, but I don't believe any of those are the problem. The female rod is currently sitting in it's most "up" position. I can push it down and feel the spring resist but cannot pull it up. Not even to where it is up past the sheet metal.

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Re: Automatic Choke Problem
Posted by: Frank DuVal ()
Date: June 06, 2017 04:27PM

Jim Rob, did you look at Matt's link to the difference in the rods, both upper and lower?

Both sides are supposed to be identical, yes, are they?

Mix up parts and there WILL not be enough adjustment range.

Read that link and then get back to us.smiling bouncing smiley

Frank DuVal

Fredericksburg, VA

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Re: Automatic Choke Problem
Posted by: Wagon Master ()
Date: June 07, 2017 05:42AM

jimrob Wrote:
-------------------------------------------------------
> The female threaded part does not come up past the
> sheet metal at all. It is about 1/8" down below
> it.


Ding Ding Ding. There's your issue. As stated earlier, the female threaded rode should be appox. an inch above the sheet metal on a cold engine.
1. The rod is too short for the coil you're using.
2. The wrong coil is being used with correct lower rod.

The rod and coil must be meant for each other. A mismatch will result in your dilemma.

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Re: Automatic Choke Problem
Posted by: Wagon Master ()
Date: June 07, 2017 06:29AM

May have misspoke slightly. There are 2 styles of choke coils. There are 2 styles of choke UPPER rods. Lower rods from coil to upper rods are the same for all years with automatic chokes. 62-63 and 64-69. These must match each other.

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Re: Automatic Choke Problem
Posted by: jimrob ()
Date: June 12, 2017 01:22PM

Today I removed the automatic choke coil and female threaded rod. The automatic choke was mounted correctly so that was not a problem. The choke is stamped "B-C" whatever that means. The length of the threaded rod is 5 3/4". The length from the choke coil mount to the end of the rod is 6 1/2". Photos attached. Is this the wrong coil, wrong rod, or wrong both?

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Re: Automatic Choke Problem
Posted by: jimrob ()
Date: June 12, 2017 01:23PM

I certainly don't want to have to remove the left one just to compare them.

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Re: Automatic Choke Problem
Posted by: jimrob ()
Date: June 12, 2017 01:25PM

The female threaded tube and rod is 5 3/4 inches long.

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Re: Automatic Choke Problem
Posted by: Timothy Shortle ()
Date: June 12, 2017 01:26PM

Years ago I had a rod that would not go down. Found out a very small rock (pebble) had found its way into the head and was jamming it.

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Re: Automatic Choke Problem
Posted by: jimrob ()
Date: June 13, 2017 08:28AM

On my car the female threaded rod is 5 3/4" long. Clark's tells me that it should be 7 1/2" long. However, my automatic choke coil does not look like the one that Clark's sells.

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Re: Automatic Choke Problem
Posted by: davemotohead ()
Date: June 13, 2017 08:42AM

Do you have any pictures of what you have? The EM design the rod from the coil to the head would not stick up past the head, it used the longer top rod to the carb, the later design the rod from the coil would stick up past the opening in the head, it used the shorter top rod to the carb, the top rods are different, the choke coils are different, not sure but think the middle rod are the same, the coil makes the difference in height I believe, But not positive.





Email me at: Dave Motohead

1960 4dr sedan caveman car
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