How do you remove a broken throttle plate blade screw from the throttle shaft?
jim larson said
Dec 15, 2014
Well, I tried to remove the screws that someone else installed. I wanted to put in the original type screws with the slotted head and the H back in. It looks like the guy used Red Locktight instead of blue or staking the screws. 1st one was OK. 2nd one broke. 3rd one OK, 4th one broke. I guess I should have done something to loosed the lock tight. But what?
So, how to I get whats left of the screw out? Thanks in advance
It seems drilling it out is the only solution. Hardly seems worth the effort to do it right- you'll probably end up needing new throttle shafts once you drill the threads out.
So- be super careful. Or find another base, or a whole different carb that needs rebuilding. You probably want to preserve this one for the numbers on it, right?
jim larson said
Dec 15, 2014
Yes I want to preserve it. Throttle shafts are available.
Lost in the 60s said
Dec 15, 2014
Get a Dremel and grind the screw down flush with the shaft so you can remove it from the base and replace the shaft.
Chris S said
Dec 15, 2014
Are there any threads sticking out the back side that you can get a hold of? If so apply some heat to melt the lock tight and spin it out the back.
If there are no threads out the back I would still heat it up and use a small drill bit, may be it would catch and spin out. Sounds like a long shot but has worked many times for me on various projects. Just have to make sure and support the throttle shaft so as not to bend it.
Bungy L-76 said
Dec 16, 2014
Another way if there is some threads sticking out the back is use a dremel tool and cut a slot in it. Then heat and use a standard screwdriver to turn it out.
I'm kinda thinking like Mitch said. Grind it down flush just to slide the shaft out and replace the shaft.
Lost in the 60s said
Dec 16, 2014
The reason I didn't suggest heat is because it is a very confined area and it will take a good amount of heat to soften the Red loc-tite. That heat can spread quickly thru brass to the aluminum base. I would avoid that. You're most likely going to need to replace the shaft anyway. That's why I suggested just getting it out safely and get it over with...
jim larson said
Dec 16, 2014
Thanks everyone. The throttle shaft was off the carb, I first tried a sobering iron; but that didn't seem to do much. The I took a fine tipped torch. Heated it for 15 second, grabbed on the back side with a needle nosed vice grips. They came right out.
The throttle shaft was new, so I wanted to re-use it.
The fine tip torch was exactly what I would've used too. Intense heat in a small tip. I just didn't know if it would spread to the base and do harm. Good job...
John D said
Dec 16, 2014
Machinist gods were smiling on you...
Bobs_Place said
Dec 16, 2014
Jim
FYI That is an OEM Carb. That throttle shaft is about 1/2" longer than the aftermarket carbs and harder to find.
jim larson said
Dec 17, 2014
I actually have four 66 carbs, and a couple of extra bodies and parts. I will have to sell some of them. Planing to keep one list 3139 and one 3419.
Scott Parkhurst said
Dec 17, 2014
Congrats! Nice work to avoid the snowballing headache that could have been.
Well, I tried to remove the screws that someone else installed.
I wanted to put in the original type screws with the slotted head and the H back in. It looks like the guy used Red Locktight instead of blue or staking the screws. 1st one was OK. 2nd one broke. 3rd one OK, 4th one broke. I guess I should have done something to loosed the lock tight. But what?
So, how to I get whats left of the screw out?
Thanks in advance
So- be super careful. Or find another base, or a whole different carb that needs rebuilding. You probably want to preserve this one for the numbers on it, right?
Yes I want to preserve it. Throttle shafts are available.
Are there any threads sticking out the back side that you can get a hold of? If so apply some heat to melt the lock tight and spin it out the back.
If there are no threads out the back I would still heat it up and use a small drill bit, may be it would catch and spin out. Sounds like a long shot but has worked many times for me on various projects. Just have to make sure and support the throttle shaft so as not to bend it.
Another way if there is some threads sticking out the back is use a dremel tool and cut a slot in it. Then heat and use a standard screwdriver to turn it out.
I'm kinda thinking like Mitch said. Grind it down flush just to slide the shaft out and replace the shaft.
The reason I didn't suggest heat is because it is a very confined area and it will take a good amount of heat to soften the Red loc-tite. That heat can spread quickly thru brass to the aluminum base. I would avoid that. You're most likely going to need to replace the shaft anyway. That's why I suggested just getting it out safely and get it over with...
Thanks everyone. The throttle shaft was off the carb, I first tried a sobering iron; but that didn't seem to do much. The I took a fine tipped torch. Heated it for 15 second, grabbed on the back side with a needle nosed vice grips. They came right out.
The throttle shaft was new, so I wanted to re-use it.
The fine tip torch was exactly what I would've used too. Intense heat in a small tip. I just didn't know if it would spread to the base and do harm. Good job...
FYI That is an OEM Carb. That throttle shaft is about 1/2" longer than the aftermarket carbs and harder to find.
I actually have four 66 carbs, and a couple of extra bodies and parts. I will have to sell some of them. Planing to keep one list 3139 and one 3419.