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Sears Suburban 12 Throttle Shaft Loose


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#1 Nascar3244888 OFFLINE  

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Posted December 09, 2012 - 05:33 PM

Found some info on the old LME Carbs that the throttle shaft can become worn over time and cause air leaks. After spraying some carb spray at the shaft and finding that the hunting mine was doing went away and also finding the shaft itself loose, I figured I had to replace It. I was able to find that carb rescue sells these shafts and bushings if needed and I wondered if someone could tell me the specs of the throttle shaft diameter and specs of the holes the shaft goes into, that way I can figure out whther or not I need just the throttle shaft or the shaft as well as a new set of bushings. Also can someone tell me whether the shaft carb rescue sells is oem sized or made especially for use in the new bushings only. Thanks.

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Edited by Nascar3244888, December 09, 2012 - 06:15 PM.


#2 chris m OFFLINE  

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Posted December 09, 2012 - 06:20 PM

Not sure of the spec off hand. But all of the replacement shafts and bushings I have seen were the same size as the factory shaft.

As far as telling if it is the shaft or the bushing that is worn, you will be able to tell when you have it out. usually you will see the shaft worn down or the shaft hole worn oblong (like an egg)

When you go to reassemble the shaft and butterfly plate, use loctite on the 2 little screws that hold the butterfly to the throttle shaft.
This is a mistake that many of us learned the hard way!

If your shaft looks good, some people have even made there own bushings for the shaft.

Hope this helps! And good luck.

#3 MH81 ONLINE  

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Posted December 09, 2012 - 08:12 PM

Odds are they are both worn some, but is the shaft acceptable with new bushings...

In my limited experience, shafts tend to wear more in one direction than the other

After the shaft is out, mic both ways where the wear would be and see if there is much difference.

#4 Nascar3244888 OFFLINE  

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Posted December 10, 2012 - 01:35 PM

well i just got it out and did some measurements, the bottom part of the shaft ( below where the butterfly goes ) seems to be at .213", above the butterfly seems to be at .210", and the area above that where the return spring goes seems to be at .213". The only part I could measure where the shaft goes is the top hole by the return spring and that has an evenly worn .218" all the way around, so does this mean I need a throttle shaft and not the bushings?????

Edited by Nascar3244888, December 10, 2012 - 01:36 PM.


#5 Hugh OFFLINE  

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Posted December 10, 2012 - 03:08 PM

When did you pick this one up?! Looks awesome! Didnt see a video come up in my subs.. That tote box is rare

#6 Nascar3244888 OFFLINE  

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Posted December 10, 2012 - 03:52 PM

When did you pick this one up?! Looks awesome! Didnt see a video come up in my subs.. That tote box is rare


:bigrofl: about a month ago, the latest vid i posted on utube is from the summer I have 5 or so yet that are not posted that i took over the summer, I will post another one soon.

#7 EricFromPa ONLINE  

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Posted December 10, 2012 - 07:06 PM

I think I would drill the shaft out and put a brass bushing in.I've done this several times on old Carter carbs.Once it's done you don't have to worry about it any more.

That IS an awefully nice Sub 12.

Edited by EricFromPa, December 10, 2012 - 07:07 PM.





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