The Ford Barn

Standing Elk · 11-23-2017, 02:00 PM

During my carb. rebuild I noticed that the throttle shaft is a bit loose in the holes. Not super bad but you can feel a little there. Which works best, drill and install bushings to bring it back to factory specs. or drill and install an oversize shaft?

Ian in Mississauga · 11-23-2017, 02:28 PM

There is a third option: Apply a little solder to the shaft. I use lead-free solder which is harder. Not just a farmer fix, do a search here on fordbarn for Rex Reheis.

Synchro909 · 11-23-2017, 03:29 PM

The shaft has to be very sloppy in the housing for it to cause a problem. I think many quite serviceable bodies/shafts are messed with unnecessarily. By the time it should be done, a little JB weld on the shaft and filed to fit will do the job fine. If you must do it, I don't think it matters much whether you used an oversized shaft or rebush the body.

johnbuckley · 11-23-2017, 03:41 PM

I find it much easier to drill and fit oversize shaft rather than the palaver of drilling and re-bushing ( in fact I can see no reason to re-bush now that oversize shafts are available). The body has to be drilled out a bigger hole to accommodate the bushings than a new o/s shaft takes so from a preserving metal point of view o/s shafts are better. Agree with Ian in #2 try solder if you don't want to send any money at all on new parts!

Gary WA · 11-23-2017, 04:08 PM

solder easy,and dosen't have to be all the way around. as per Rex Thanks

Chuck Sea/Tac · 11-23-2017, 06:42 PM

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I think regular solder is a little soft, and will re wear. Unfortunately the better solder # 8 staybrite bearing solder is pretty expensive.

Larry Jenkins · 11-23-2017, 06:49 PM

Isn't there something about air leakage from a sloppy fitting shaft and good carburetion?

mike657894 · 11-23-2017, 07:31 PM

you could solder the opening and drill that to get a tight fit. or fill it and drill it.

johnbuckley · 11-24-2017, 03:45 AM

Quote:

Originally Posted by Larry Jenkins

Isn't there something about air leakage from a sloppy fitting shaft and good carburetion?

Yes a sloppy shaft can allow air air to be drawn through it ( especially at idle) making the mix weaker, having said that I'll add ....if it runs OK it is Ok!

BRENT in 10-uh-C · 11-24-2017, 09:20 AM

Quote:

Originally Posted by johnbuckley

Yes a sloppy shaft can allow air air to be drawn through it ( especially at idle) making the mix weaker, having said that I'll add ....if it runs OK it is Ok!

Yes, this is very true. Adding to the comment, the way you control the engine speed is by controlling the air, -not the fuel. Leaky shafts will not allow an engine to idle down low. Also, carburetors that have leaky shafts will not idle well and can contribute to stalling issues on quick deceleration.

One note of caution is you really do not want to drill the housing bore but instead you need to ream it to size. I actually have modified a large angle plate where I can bolt the upper house to the angle plate to index it vertically, and then it is easy to ream it with the Mill if your head is trammed in correctly.

Big hammer · 11-24-2017, 12:24 PM

Good advice Brent! How about using a oversized shaft and turn it down to fit the body?

HoarseWhisperer · 11-24-2017, 01:40 PM

x2 to what Brent said. Repairing or replacing sloppy throttle shafts goes a long way towards reducing stalling at stops.

Terry, NJ · 11-24-2017, 07:26 PM

X3 to what Brent said! Use a reamer! HA! Where do you find a reamer that size? I was getting .267-.269 . I went out in the shop (colder than a witch's underwear) and I was shaking a little bit. And I was trying measure with a vernier. In any event, I would normally tell someone to ream the bore for trueness, trying to drill it often produces a three sided hole. If I'm any where near to correct on that shaft size, it's not a standard fractional size so I don't know what you would ream it with. 1/4' = .250 1/64 over 1/4 (17/64) or .265 9/32 or 1/32 over is .281. There might be a letter size reamer. I don't know. I've probably got the shaft size wrong I was shaking so much, it should be verified.
And old toolmakers trick, use a ball from a ball bearing (about 3/8 to 1/2 in, dia.) seat it on the hole and give it a sharp rap. This is called "staking" and will "tighten" a bore. Many a loose bearing seat has been been "Fixed" using this method. Good luck!
Terry

katy · 11-25-2017, 11:26 AM

Bratton's catalogue says the standard shaft is 9/32" and the oversize shaft is 19/64"

JD 1931 · 11-25-2017, 02:30 PM

got drill press it is easy to install bushing....

11-23-2017, 02:00 PM	#1
Standing Elk Senior Member Join Date: Aug 2017 Location: St. Maries, Idaho Posts: 162	Throttle shaft ??bush or go oversize During my carb. rebuild I noticed that the throttle shaft is a bit loose in the holes. Not super bad but you can feel a little there. Which works best, drill and install bushings to bring it back to factory specs. or drill and install an oversize shaft?

11-23-2017, 03:29 PM	#3
Synchro909 Senior Member Join Date: Jun 2014 Location: Melbourne, Australia Posts: 7,496	Re: Throttle shaft ??bush or go oversize The shaft has to be very sloppy in the housing for it to cause a problem. I think many quite serviceable bodies/shafts are messed with unnecessarily. By the time it should be done, a little JB weld on the shaft and filed to fit will do the job fine. If you must do it, I don't think it matters much whether you used an oversized shaft or rebush the body. __________________ I'm part of the only ever generation with an analogue childhood and a digital adulthood.

11-23-2017, 03:41 PM	#4
johnbuckley Senior Member Join Date: Jul 2010 Location: United Kingdom Posts: 1,441	Re: Throttle shaft ??bush or go oversize I find it much easier to drill and fit oversize shaft rather than the palaver of drilling and re-bushing ( in fact I can see no reason to re-bush now that oversize shafts are available). The body has to be drilled out a bigger hole to accommodate the bushings than a new o/s shaft takes so from a preserving metal point of view o/s shafts are better. Agree with Ian in #2 try solder if you don't want to send any money at all on new parts!

11-23-2017, 06:42 PM	#6
Chuck Sea/Tac Senior Member Join Date: May 2010 Location: Between Seattle & Tacoma Posts: 2,354	Re: Throttle shaft ??bush or go oversize Sponsored Links (Register now to hide all advertisements) I think regular solder is a little soft, and will re wear. Unfortunately the better solder # 8 staybrite bearing solder is pretty expensive.

11-23-2017, 06:49 PM	#7
Larry Jenkins BANNED Join Date: Feb 2015 Location: East Central Iowa Posts: 1,275	Re: Throttle shaft ??bush or go oversize Isn't there something about air leakage from a sloppy fitting shaft and good carburetion? __________________ Good enough.. Isn't.

11-23-2017, 02:28 PM	#2
Ian in Mississauga Senior Member Join Date: May 2010 Posts: 136	Re: Throttle shaft ??bush or go oversize There is a third option: Apply a little solder to the shaft. I use lead-free solder which is harder. Not just a farmer fix, do a search here on fordbarn for Rex Reheis.

11-23-2017, 07:31 PM	#8
mike657894 Senior Member Join Date: Oct 2015 Location: Bay City Michigan Posts: 1,050	Re: Throttle shaft ??bush or go oversize you could solder the opening and drill that to get a tight fit. or fill it and drill it.

11-24-2017, 12:24 PM	#11
Big hammer Senior Member Join Date: Jun 2014 Location: Land of Lincoln Posts: 3,127	Re: Throttle shaft ??bush or go oversize Good advice Brent! How about using a oversized shaft and turn it down to fit the body? __________________ Don't force it with a little hammer tap, tap, tap get a bigger hammer tap done

11-24-2017, 01:40 PM	#12
HoarseWhisperer Senior Member Join Date: May 2010 Location: Ontario, Canada Posts: 1,470	Re: Throttle shaft ??bush or go oversize x2 to what Brent said. Repairing or replacing sloppy throttle shafts goes a long way towards reducing stalling at stops. __________________ I know a lot of things; I just can't remember them all. 1928 CCPU 82-A 1931 Roadster 40-B Dlx (Canadian)

11-24-2017, 07:26 PM	#13
Terry, NJ Senior Member Join Date: May 2010 Location: Bucks Co, Pa Posts: 3,740	Re: Throttle shaft ??bush or go oversize X3 to what Brent said! Use a reamer! HA! Where do you find a reamer that size? I was getting .267-.269 . I went out in the shop (colder than a witch's underwear) and I was shaking a little bit. And I was trying measure with a vernier. In any event, I would normally tell someone to ream the bore for trueness, trying to drill it often produces a three sided hole. If I'm any where near to correct on that shaft size, it's not a standard fractional size so I don't know what you would ream it with. 1/4' = .250 1/64 over 1/4 (17/64) or .265 9/32 or 1/32 over is .281. There might be a letter size reamer. I don't know. I've probably got the shaft size wrong I was shaking so much, it should be verified. And old toolmakers trick, use a ball from a ball bearing (about 3/8 to 1/2 in, dia.) seat it on the hole and give it a sharp rap. This is called "staking" and will "tighten" a bore. Many a loose bearing seat has been been "Fixed" using this method. Good luck! Terry

11-25-2017, 11:26 AM	#14
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,042	Re: Throttle shaft ??bush or go oversize Bratton's catalogue says the standard shaft is 9/32" and the oversize shaft is 19/64" __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!

11-25-2017, 02:30 PM	#15
JD 1931 Senior Member Join Date: Jul 2010 Location: west coast Fla.. Posts: 311	Re: Throttle shaft ??bush or go oversize got drill press it is easy to install bushing....