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So I've been going through this guide (https://therangerstation.com/tech_li..._2150_carb.pdf) to set my choke and I started with "Choke major adjustments - if someone has messed with the adjustments" section and through the first choke setting but for the life of me cannot follow this portion:
"Partially unbend a paper clip and use a pair of pliers to make a 90 degree bend 1/8 of an inch from the end. Put the bent end of the paper clip into the right side of the slot on top of the small piston in the choke housing. Push the piston and paper clip down until the paper clip catches on the ridge on the inside of the cylinder. At that point push on the lever inside the choke housing counterclockwise. The paper clip on the ridge should prevent the choke piston from going up...."
I have stared at this choke housing for about an hour now and have no idea where the location of this elusive piston is. Also, from the directions I cant tell exactly how you bend this paper clip? Attached is pic. Thank you all.
The piston is inside the cylinder thing right in front of your thumb in the picture above. The small bend and tip of the paper clip is right over it in the picture.
Here is another link with possibly some better pictures. It looks to me that to do this procedure, the ranger station guy is using the paper clip, the procedure in this link are starting the engine. I believe they are putting vacuum on this piston to pull it down, while the ranger station guy is using a paper clip to pull it down. Looks like this whole part of the procedure is setting the fast idle speed of the engine in relation to how far open or closed the choke is. If you know the history of this carb, and it ran ok before when the choke was working, I would not mess with this adjustment myself. You can check it to see if it's close though.
The piston is inside the cylinder thing right in front of your thumb in the picture above. The small bend and tip of the paper clip is right over it in the picture.
Here is another link with possibly some better pictures. It looks to me that to do this procedure, the ranger station guy is using the paper clip, the procedure in this link are starting the engine. I believe they are putting vacuum on this piston to pull it down, while the ranger station guy is using a paper clip to pull it down. Looks like this whole part of the procedure is setting the fast idle speed of the engine in relation to how far open or closed the choke is. If you know the history of this carb, and it ran ok before when the choke was working, I would not mess with this adjustment myself. You can check it to see if it's close though.
That my take on the this part of the adjustment.
I have not known anyone that has done this part on a carb?
Now with that said I have to check mine as I just got the hot air part hooked up and it is pulling way to much vacuum thru and causing a vacuum leak and now cant adjust the carb.
A member told me mine might be missing the piston assy. I don't know as I did not look that closely when I rebuilt it so need to pull it apart again.
Thing is the truck starts and runs, for moving, pretty good but it also has not been that cold here yet.
Dave ----
That my take on the this part of the adjustment.
I have not known anyone that has done this part on a carb?
Now with that said I have to check mine as I just got the hot air part hooked up and it is pulling way to much vacuum thru and causing a vacuum leak and now cant adjust the carb.
A member told me mine might be missing the piston assy. I don't know as I did not look that closely when I rebuilt it so need to pull it apart again.
Thing is the truck starts and runs, for moving, pretty good but it also has not been that cold here yet.
Dave ----
Dave, that is exactly it. Mine does not have the piston assembly. And that was an untouched reman carb, and the extra old carb that came with the truck did not have the piston assembly either. I’m getting confused on the adjustments now. I’m just gonna throw it on the truck and see what happens.
Looking at it further, does the 2100 series carb have the piston (using it as the choke pull-off) and the 2150 carbs use the external choke pull-off? In other words, if you have the #1 piece in the picture below, you probably do not have the piston?
Now I was told the piston limits the amount of vacuum that is pulled thru the hot air system.
As I posted when I got the hot air system plumbed the idle was too high and the idle mixture did nothing because idle was high.
I have yet pulled the black cap off to see if mine (Carter 1v for a 300 six) has the piston or not.
If not I do have a 2100 I took some other parts from that I can check and steal from.
The other thing I was thinking is to limit the vacuum the system could pull by closing off the fresh air tubing little by little till I get a good balance for that system to work but not pull to much vacuum to cause a leak.
I’m just gonna throw it on the truck and see what happens.
That's what I would do you may find you don't have to do anything other than idle speed & mixture and have it run great.
Dave ----
That's what I would do you may find you don't have to do anything other than idle speed & mixture and have it run great.
Dave ----
Yup, all is well, all I have to do now is adjust my idle. I have this post and another that have kind of converged into the same topic but all I had to do was the 1 choke adjustment to get me at the baseline. Amazing how one obstruction in your carbs affects performance. Didn’t know this truck accelerated so well/quickly, super sluggish since the day I’ve had it until cleaning/tuning it up.
