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Farmall & IHC Tractors Discussion Forum
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Re: F-20 flywheel installation update

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cleddy

07-01-2013 18:17:34
174.74.58.129



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Wow-Not much question about how most of the folks feel about this subject. Every Flywheel I seen taken off old tractors or trucks have scoring and surface cracks from excessive slipping of the clutch and heat. I have never heard of a Machine shop refusing to grind them because of liability reasons and do it for the purpose to get more use from them and those cracks don't grind out.

Am I missing something here or is it the general feeling flywheels with any defects should be replaced? I know the restorers tend to be perfectionist and money is not a object most of the time. How many of you have witnessed a Flywheel exploding?I have seen fan blades break and that seems to be a more imaginable disaster which could happen at any moment. cleddy

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Janicholson

07-01-2013 20:53:10
74.60.94.18



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 Re: F-20 flywheel installation update in reply to cleddy, 07-01-2013 18:17:34  
Heat checking is a surface issue that is not in the location this crack is located. Stress risers at the end of a crack is dramatic, and can cause catastrophic failure. The Iowa air crash (in the 1980s) was caused by such a crack. The fact that a keyway was abused in the process and difficulty putting it on the crank stub, puts expansive strain on the wheel. Not good at all.
My grandfather was almost killed at a saw mill when the governor belt came off of the steam engine and it ran away exploding not only the saw blade (after spitting out the inserts at extreme velocity) but the flywheel as well.
A student in my auto school lost both feet in a 57 Chevy when racing at a drag strip. The wheel took out the dash and windshield nearly cut the tin of the body in half and took both feet at the ankles. We are serious about safety and would not make the point as firmly if it were not an issue. Don't give grief about the low speed engine compared to a jet, every one was designed to be crack free at the expected speed and was not. Jim

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riverbend

07-02-2013 18:48:52
74.46.182.81



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 Re: F-20 flywheel installation update in reply to Janicholson, 07-01-2013 20:53:10  
geez, yuk.

My brother always wrapped the bell housing with a ballistic blanket when drag racing. Makes sense now.

Greg



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cleddy

07-01-2013 21:17:26
174.74.58.129



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 Re: F-20 flywheel installation update in reply to Janicholson, 07-01-2013 20:53:10  
Thanks for the information. I see your point and being around this equipment all the time this may advoid being in a accident or causing one by being more informed. I would not like any of my repairs to cause an accident. I hope I did not give the wrong impression because all the mechanical failures I've seen over about 50 years or you hear about, it is just amazing that worse stuff doesn't happen.
cleddy

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Janicholson

07-01-2013 21:21:03
74.60.94.18



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 Re: F-20 flywheel installation update in reply to cleddy, 07-01-2013 21:17:26  
You are welcome. Having a wheel fall off of a tricycle is one thing, having a tractor explode is another! Jim



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