Throttle Linkage

nickair

nickair

Senior Member
Guys,
I have a friend that has a 28 tudor that is not getting full power with a top speed of 45.

Upon inspection today the carb is not getting full throw from the throttle linkage. It appears that the Accelerator Pedal Linkage shaft end piece (carb side of engine) has some slop. There is no obvious provision for adjusting? Photo at post #3

Need some ideas to resolve this.
 
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Hey Nick,
Pictures would help explain what it is your talking to. Myself, I'm thinking , from you verbiage , that you MAY be talking about the carb 'throttle shaft' ..no?
 
Hardtimes is right. Thank you. A photo is worth a 1000 words.

The Accelerator Pedal Linkage shaft shows some slop. When inspecting operation today, located at the right side (bottom in photo) of the shaft and the end fitting that connects to the carb link. The slop is at the end piece twisting on the shaft enough to realize over 1/4 inch throw shortage at the carb.
 

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  • Carburator throttle linkage.JPG
    Carburator throttle linkage.JPG
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the throttle brackets get all buggered up, usually from pulling or installing the engine with the bracket attached. It catches the firewall and gets bent back on the way out, and bangs into the firewall, crushing it on the way in. If the part that has the throttle button attached and which bends around the flywheel housing bolt was bent, it will hit the bolt and interfere with full throttle throw.. If the entire bracket was bent back towards the firewall, that will also restrict full throw. If it was crushed up against the engine block, you will have trouble getting the throttle to go to idle position. Some people, when it does not go to idle, then bend the long arm back so it will go to the idle stop, but then it will not go to full throttle. So you will have to study it and determine how you want to bend it to get it back to the original condition. If it is really loose at the pivot, find a better one.
 
I have not worked on the early assembly, but I wonder if any of the pins that hold the arm on at the passenger side, or at the foot feed are wallowed out. if the arms are moving on the shaft I would fix that first. you can get home if a pin breaks with the throttle arm on the steering column, but, to diagnose the short throw on the throttle at the carb I would first correct the slop in the throttle assembly before I started doing any bending.
 
The arm on the earlier accelerator assemblies where the throttle rod that goes to the carb connects is pinned in place . It could be loose where the arm pins to the shaft on the accelerator assembly that is giving you some slack. I've had the pins to shear on the earlier assemblies. The later accelerator assemblies had the arm and shaft made as one piece and could be bent to adjust movement for full throttle or idle, which ever way it needed to go. The early accelerator assembly was prone to shearing a pin if the lever was bent in an attempt to adjust . Or it could just as easily be any of the things that Pat in Santa Cruz says above.
 
Pat may very well be spot on with the Accelerator Pedal Linkage being bent from an engine install. We will look for clearance issues as suggested.

I agree with Bob and Purdey as to the shaft pin needing replacement.

Thanks Purdey for pointing out that bending it for compensation may further compromise what is left of the pin.

Anyone have a location for drawings and specs on the Accelerator Pedal Linkage.

Q: Is the 28 tudor Accelerator Pedal Linkage shaft pinned with roll pins?
 
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Sorry Brentwood Bob and Bob C I'm real slow at typing By the time I proof read and corrected a few mistakes, you beat me.
 
All on the same page. I am sure I don't have the early throttle assembly to check.
A roll pin has to be an improvement. I think Henry would have used them.
Bob
 
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