Early '72 carb linkage & choke

[zerbit]

OK, I'm bad with carb linkage: how do you adjust the choke to operate the butterfly? The way it is now, with the choke button pushed in on the dash, the butterfly is open, pulling it it does nothing. If I loosen the screw on the cable and cable housing I can manually close the butterfly and the truck starts right up, but revs high. Does anyone have a good linkage diagram I could look at and how the choke is adjusted? The issues came up with poor cold starts, I saw that the butterfly was open, when I loosened it up and closed it, the truck fired right up. My linkage must be messed up, the butterfly does not open when the vehicle heats up.

Thanks,

Mike

 

[sepr2]

Sounds like the cable is frozen. Its all manual so when you pull inside it should move the choke plate on the carb. When disconnected from the carb does the cable move on the carb end when you pull and push the dash button? Might try some penetrating oil on the cable to loosen it up??

 

[FF LC FREAK]

Either your cable is frozen/rusted and not moving as stated above, or it is broken inside the sheath. As you pull the knob, it closes the butterfly and increases the idle speed. You can change the high idle/choke speed with the screw next to the red arrow in the picture.

You can pull the choke cable out of the sheath (assuming its not broken) and lubricate it with your choice of lube (I've seen where Mark A uses motor oil, so that is what I used awhile back - works great).

Good luck!

 

[Assassin]

my manual choke was stuck, pb blaster, steel wool, and it works great.......

my manual choke thread https://forum.ih8mud.com/40-55-series-tech/340642-manual-choke.html

 

[65swb45]

If your cable is stock, and you want to make it last as long as possible, I would recommend removing it from the vehicle to work on it.

Once removed, you can lay it on a flat surface and begin the process of straightening the kinks in the cable and housing with a mallet. If you spray the housing ahead of time, then the mallet blows will also help the lubricant penetrate. Once you have malleted the cable from end to end, THEN try to pull the cable out of the housing.

Once removed, you can finish straightening the kinks in the cable with a ball peen hammer on an anvil or bench vise.

I have used this method on my 40+ year old cables in both my 64 and 68, and they still work well to this day.

Best

Mark A.

 

[zerbit]

The cable works fine, but the linkage seems bound up somehow. Is the choke cable set up on the carb on a warm or cold engine?

 

[zerbit]

I loosened the cable housing and the wire, the butterfly was bound up, I lubed it, got it to move freely. Then I pulled the choke out fully, closed the butterfly, tightened both the wire and cable housing and truck fired up fast on the first try! Thanks to all.

Mike