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Hit & Miss Gas Engine Discussion Meet collectors of hit and miss engines, ask questions about collecting, restoring and showing antique flywheel engines.

Hit & Miss Gas Engine Discussion

Installing a fly wheel key


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  #1  
Old 09-12-2009, 05:29:05 PM
Rag
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Default Installing a fly wheel key

I'm installing the key on 1 1/2 hp fly wheel. The fly wheel hub is at least 3 inches deep. The old key, and a new one I bought, only goes in an inch even with tapping.
How should they be installed? Do you file and fit them to penetrate at least 2 inches? Pure pounding seems like a bad way to go.
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  #2  
Old 09-12-2009, 05:51:54 PM
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Byron Roberts Byron Roberts is offline
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Default Re: Installing a fly wheel key

So if the old key only went in about 1" ..i would say it was installed wrong..i would think if it was shaped to size of end of key that fits..it should be good..to big of taper will not be good..and pounding in will not help in a long run..B,
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Old 09-12-2009, 06:10:47 PM
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Default Re: Installing a fly wheel key

So, you say I should file/sand to get good penetration and a bit of wedging at the end?
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Old 09-12-2009, 06:33:56 PM
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Default Re: Installing a fly wheel key

Yea..I agree the more you can get fit into the hub the better..Maybe someone more knolagable(sp) than me knows ..I don't remember the keyway ever on a flywheel being cut at a taper...B,
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Old 09-12-2009, 09:30:28 PM
Joe Morris Joe Morris is offline
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Default Re: Installing a fly wheel key

You can't get the riht answer to your question until you tell the brand of engine you have . If the engine has a split hub with bolts spanning the split use a straight square key. spread the hub slightly with a chisel. Then drive the key in. THEN tighten the bolts. If the flywheel have no split in the hub it takes a tapered Gib key driven in until ti is securely driven in. Give us little more info. Good luck in a good hobby Joe Morris
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Old 09-12-2009, 11:33:57 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Installing a fly wheel key

If it's a gibb key you need to fit it. I use a pemanent marker, but you are supposed to use bluing. I mark the key, slide it in and remove it, file the high spot. It should go all of the way nearly through the flywheel if fitted correctly, should not bottom out angainst the flywheel on the outside, or the crank or gear on the inside, try to get maximum contact with the flywheel.
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Old 09-13-2009, 01:46:49 AM
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Default Re: Installing a fly wheel key

Many old engines used non-standard keys and keyways.
In those cases you HAVE to do the best you can with what you have.
If you have a large enough grinding wheel the side of the wheel can be very handy for removing material from the key more evenly than across the face of the wheel.
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Old 09-13-2009, 05:26:22 AM
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Default Re: Installing a fly wheel key

Quote:
Originally Posted by Craig A View Post
If you have a large enough grinding wheel the side of the wheel can be very handy for removing material from the key more evenly than across the face of the wheel.
A belt sander works quite well too!
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  #9  
Old 09-13-2009, 10:17:18 AM
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Default Re: Installing a fly wheel key

Thanks guys. It's a 1 1/2 hp IHC-M using a gib key. That is, it has a raised end, but if tapered, very slight.
I'll try fitting with file and sand paper.
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Old 09-13-2009, 11:32:36 AM
Dave Rhoades Dave Rhoades is offline
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Default Re: Installing a fly wheel key

I use a candle to blacken the key then draw file the shinny areas.
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Old 09-14-2009, 09:02:55 AM
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Default Re: Installing a fly wheel key

Got it fitted with marker and file. Thanks
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Old 09-14-2009, 10:53:17 PM
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Default Re: Installing a fly wheel key

Good job. The taper on a gib key is 1/8th inch per foot.Rag I just bought a McCormick Deering 1 1/2 hp with WICO mag.It ran all weekend at Penns Cave.Dick
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Old 09-14-2009, 11:32:27 PM
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Default Re: Installing a fly wheel key

1/8" per foot is the standard........but LOTS of 'em aren't standard.......
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Old 09-15-2009, 11:09:22 PM
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Default Re: Installing a fly wheel key

Quote:
Originally Posted by Dick Graybill View Post
Good job. The taper on a gib key is 1/8th inch per foot.Rag I just bought a McCormick Deering 1 1/2 hp with WICO mag.It ran all weekend at Penns Cave.Dick
I wish I had made it up there to say hi, Dick.
Would like to have seen the M.
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