Another myth put out to pasture I am in the process of building a 258" engine for my "t" tub. I had two crankshafts that had been stored on the floor on their sides wrapped in plastic for at least 20 years. I took them both to the machine shop to be checked and have the best one prepped to use. It turned out that the were both good, so we decided to use the one that looked the best, which cleaned up at .010-.020. Knowing that there is some controversy about storing crankshafts, I asked the machinist to check them both for run-out. He said both were less than .003, and in any event, turning them .010 or more would render even that small amount of no consequence.
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Re: Another myth put out to pasture Good to know.
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Re: Another myth put out to pasture How does this put the myth to rest? If properly stored they should have no run out. I wouldn't be happy checking for run out on a shaft of any type and finding .003.
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Re: Another myth put out to pasture Fine. Feel free to scrap all of your crankshafts with less than .003 run-out. Not me.
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Re: Another myth put out to pasture Hey Tub it didn't take long did it!!
R |
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Re: Another myth put out to pasture So if this myth were to be true, then when hanging a crank by the front counterweight the crank is going to stretch, what with 80% or more the of crank's weight suspended off-center (2 inches off-center in the case of a Merc crank)!
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Re: Another myth put out to pasture So if you store it on end without hanging, will it compress over time?
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Trying to zigzag your way to the crankgrinder.....sooner or later they will get you ;) |
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No machine shop i have called on hangs a crankshaft by the counterweight!! R |
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Re: Another myth put out to pasture Hi all; I had 3 merc cranks verticaly stored by leaning against the wall in '96. I was outside my shop going to work ,at about 5:30 am, and our 'spring break quake' hit, a 5.6 er. My shop sounded like a Sunday church call to services! Ding-dong-ding, One crank is cracked BAD, and I never checked the other two. You can't always win.. Newc
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