Helpful ReplyKeeps Breaking Fly Wheel Keys 
Cokeman
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Keeps Breaking Fly Wheel Keys
Hello, I have a Craftsman mower with a 5HP Tecumseh engine. The engine model number is 143.975016. The mower model number is 917.387140. The fly wheel key broke when it hit cement and I replaced it. It broke again half way through mowing the lawn and again before finishing. I noticed that the fly wheel nut was loose when I replaced it again. I thought I had it tight. I have seen many posts where people had this same problem because they didn't tighten it to the proper torque setting. I am trying to find the torque setting. Where can I find it? Does this sound like it's the cause of the problem or could it be something else.
post edited by Cokeman - 2021/05/02 15:15:32
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Scrubcadet2010
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Re: Keeps Breaking Fly Wheel Keys
2021/05/10 18:05:08
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450 Inch pounds, roughly 37.5 ft lbs. (37.499999)
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Cokeman
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Re: Keeps Breaking Fly Wheel Keys
2021/05/11 02:33:17
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I set to to 40 foot pounds and put everything back together. Now we’ll see if that gets it.
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AVB
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Re: Keeps Breaking Fly Wheel Keys
2021/05/11 07:14:58
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☄ Helpfulby Scrubcadet2010 2021/05/11 11:27:25
Scrubcadet2010
450 Inch pounds, roughly 37.5 ft lbs. (37.499999)
The 143.975016 is a Tecumseh TVS 115 - 61065D If TVS 4 cycle engines used a cast iron flywheel. Note service has Flywheel Nut (Cast iron) but I believe they are referring to the flywheel itself as being cast iron. Torque specs 550 in-lbs (46 ft-lbs) (64 nM) per the service manual. Otherwise if Aluminum then Scrub is right on the torque spec. Cokeman
I set to to 40 foot pounds and put everything back together. Now we’ll see if that gets it.
If you torque to only 40 ft-lbs it will shear again if it is a cast iron flywheel.
post edited by AVB - 2021/05/11 07:27:36
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Cokeman
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Re: Keeps Breaking Fly Wheel Keys
2021/06/05 00:22:55
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I hit the fly wheel with a screwdrivers and it sounded like aluminum. I then scratched its surface and it looks like aluminum. I left it at 40 ft-lbs and it’s working fine now.
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AVB
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Re: Keeps Breaking Fly Wheel Keys
2021/06/05 06:54:36
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Cokeman
I hit the fly wheel with a screwdrivers and it sounded like aluminum. I then scratched its surface and it looks like aluminum. I left it at 40 ft-lbs and it’s working fine now.
You might need to know it is much easier to check the flywheel with a magnet. Magnets don't stick to aluminum but do stick to cast iron something you should have learn in school science class. Now of the magnet will stick to other magnets.
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Cokeman
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Re: Keeps Breaking Fly Wheel Keys
2021/06/05 12:00:58
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