flathead accelerator rod/spring
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Laughing Gas
Joined: Feb 2014
Posts: 794
Likes: 120
From: Behind the wheel, IN
flathead accelerator rod/spring
My flathead had a custom accelerator spring configuration. This consisted of the spring being hooked on to another, larger spring, which was zip tied to the plug wire loom/bracket.
I replaced the spring, and the linkage rod (old one was bent) last night. I'm not sure where the spring it supposed to be hooked up. I hooked it into a hole on the back of the carb, just behind where the vacuum for the distributor connects.
Now, when I hit the gas, the accelerator doesn't return where it used to. I reached under the hood and pushed the linkage forward. When I did that, the engine began to idle lower than I've ever noticed before. After messing with it a little more, I'm thinking that maybe the carb is sticking open, and thats why PO did the custom spring setup.
Thoughts? Suggestions?
I replaced the spring, and the linkage rod (old one was bent) last night. I'm not sure where the spring it supposed to be hooked up. I hooked it into a hole on the back of the carb, just behind where the vacuum for the distributor connects.
Now, when I hit the gas, the accelerator doesn't return where it used to. I reached under the hood and pushed the linkage forward. When I did that, the engine began to idle lower than I've ever noticed before. After messing with it a little more, I'm thinking that maybe the carb is sticking open, and thats why PO did the custom spring setup.
Thoughts? Suggestions?
Freshman User
Joined: Jun 2014
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FWIW, I'm having the same problem. In my case, it seems as though it is actually the accelerator pump in the carb that is sticking and preventing everything from returning to the idle stop position. Having this problem with both an original Ford script carb that I rehab'd and a brand new one I just got from Dennis Carpenter.
Keep me posted on any solutions.
Keep me posted on any solutions.
Senior User
Joined: May 2013
Posts: 119
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carb spring
JP, i'm looking at your pic and i see NO extension of the spring. u need to find a better location a little forward of where it's at now.. spring being in a relaxed point or very close to it, ain't gonna work.
FTE Chapter Leader
Joined: Dec 2001
Posts: 3,636
Likes: 11
From: Crossville, Tn
My spring is hooked around the heater hose connector on the right side head, I saw it there in a picture somewhere. (When I got the truck, it was actually hooked on the choke cable bracket, but it would bind there.
But the REAL QUESTION IS, where did you get that new accelerator rod? There are several of us that have been looking for them.
But the REAL QUESTION IS, where did you get that new accelerator rod? There are several of us that have been looking for them.
Elder User
Joined: Aug 2012
Posts: 751
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From: Cuba, AL (NO internet)
I agree. Mine is way more stretched than that.
Fleet Owner
Joined: Jul 2004
Posts: 27,296
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From: NM
There is a hole in the choke cable plate, that is where it goes. I can't see the carb end of the OP's spring but it appears to be in about the right spot. I believe the correct installation tho is to put the coiled end at the carb, so it won't foul the linkage.
Usually when there is a problem returning to idle it's because of a worn throttle shaft.
Usually when there is a problem returning to idle it's because of a worn throttle shaft.
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Laughing Gas
Joined: Feb 2014
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From: Behind the wheel, IN
Thanks
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Thread Starter
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Laughing Gas
Joined: Feb 2014
Posts: 794
Likes: 120
From: Behind the wheel, IN
My spring is hooked around the heater hose connector on the right side head, I saw it there in a picture somewhere. (When I got the truck, it was actually hooked on the choke cable bracket, but it would bind there.
But the REAL QUESTION IS, where did you get that new accelerator rod? There are several of us that have been looking for them.
But the REAL QUESTION IS, where did you get that new accelerator rod? There are several of us that have been looking for them.
It's probably not the right part, but this is the one I bought:
Ford - Ford Accelerator To Carburetor Rod - 10.75 - Ford Deluxe | 91A-9747 - Macs Auto Parts
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Thread Starter
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Laughing Gas
Joined: Feb 2014
Posts: 794
Likes: 120
From: Behind the wheel, IN
There is a hole in the choke cable plate, that is where it goes. I can't see the carb end of the OP's spring but it appears to be in about the right spot. I believe the correct installation tho is to put the coiled end at the carb, so it won't foul the linkage.
Usually when there is a problem returning to idle it's because of a worn throttle shaft.
Usually when there is a problem returning to idle it's because of a worn throttle shaft.
That is where I had it hooked up. Shortly after posting this, I realized I probably needed to reverse the spring. I did that last night.
While messing with it last night, I noticed that the carb has a small fuel leak. It's probably time to rebuild it.
Thanks,
FTE Chapter Leader
Joined: Dec 2001
Posts: 3,636
Likes: 11
From: Crossville, Tn
It's probably not the right part, but this is the one I bought:
Ford - Ford Accelerator To Carburetor Rod - 10.75 - Ford Deluxe | 91A-9747 - Macs Auto Parts
Ford - Ford Accelerator To Carburetor Rod - 10.75 - Ford Deluxe | 91A-9747 - Macs Auto Parts
FTE Chapter Leader
Joined: Dec 2001
Posts: 3,636
Likes: 11
From: Crossville, Tn
Yea, midwest list it as a 91A9747, the same as Mac's which like the hot rod sites I have found list it for the 32-48 flatheads. I have a homemade one that somebody made out of a piece of copper tubing, I'll have to measure it. I was going on the parts list which as you can see calls for 11.69"
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