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Antique Gas Engine Discussion

IHC M throttle shaft worn


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Old 05-24-2005, 10:46:39 PM
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TomFG TomFG is offline
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Default IHC M throttle shaft worn

My IHC M 1 1/2 hp has a very sloppy throttle shaft. The shaft
wobbles around in the bore too much, and will be sucking
too much air, if and when I ever get it running for the first time.
Any suggestions? I'm guessing my easiest course of action would
be to drill out the shaft bore, and put a bushing in it.
Might be a little tricky on the inner shaft bore hole though.
I don't think making an oversize throttle shaft would be too
easy, as the old brass shaft is pressed into the pot metal end.
I could see that breaking real easy.
How have any of you tackled sloppy throttle shafts on the M's?
Thanks, Tom
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Old 05-24-2005, 11:53:50 PM
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Junkologist Junkologist is offline
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Default Re: IHC M throttle shaft worn

I think what I would do, is get some epoxy like JB Weld and fill the throttle shaft holes with it and then drill them out to fit the throttle shaft. It would be hard to notice and I think it would last a good long time. I have fixed many carbs with sloppy throttle shafts this way.

Mike
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Old 05-25-2005, 02:16:17 AM
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John Hammink John Hammink is offline
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Default Re: IHC M throttle shaft worn

When it is worn out, I use a new trottle assy and drill the shaft hole out and place new made bushings with a press in fit and add a little loctite 270 at the od, it sits like a rock. The excess of the bushing inside the trottle plate hole, can be milled away like in the picture.This works great for me.
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Old 05-25-2005, 09:44:24 AM
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Default Re: IHC M throttle shaft worn

Thanks Mike and John for the great ideas. I was pondering bushings....but didn't even think about JB Weld. Thanks again for the help!
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Old 05-26-2005, 01:01:02 AM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: IHC M throttle shaft worn

The IHC M heads are dry heads - they get real hot, especially if you use Kerosene! JB Weld may not stand up to the wear and heat. Get a new throttle shaft from one of Harry's advertisers, and see how much slop you have with the new shaft - the originals are soft brass, and the head may not be worn badly. If the head is worn, have a shop install new bushings. If the shaft is not centered, when installed, the throttle will not close properly. Also, make sure to stake the screw for the throttle plate, so it can't work out, and drop the throttle plate.
Andrew
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Old 05-26-2005, 09:45:47 PM
Chip Watford Chip Watford is offline
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Default Re: IHC M throttle shaft worn

Tom,I repaired the throttle shaft on my 6hp M as Mike said,with JB Weld and have had no problems.JB Weld is rated at 500 degrees and the shaft is in the gas and air stream which I figured should keep it cool enough.I filled the rear hole then stuck a 3/8 drill bit, shank first,into the epoxy.When it set up I twisted it out and had a perfect hole.I agree with Andrew and John,a bushing would be the best fix but your not doing anything that can't be undone should you decide. Chip
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