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Old 12-28-2015, 10:56 PM
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clay1811/44c clay1811/44c is offline
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Default Media blasting a crank?
I have a Maytag 92 that needed a different crank. Got the crank in the mail today with a crankcase and new bearings installed. The entire crank has been media blasted. I would think blasting any machined surface would be a no no. Any thoughts on this.
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Old 12-28-2015, 11:00 PM
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id say its junk, im not even sure you could polish it once its been blasted. you could have it cut but then you'll be looking for undersized bearings.
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Old 12-28-2015, 11:02 PM
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Like the rod journal surface? That would be a big no-no....
Media blasting does remove metal. That's why it works. I am not familiar with that motor... does it use ball or tapered bearings on the mains? If so, and then fit snug, I'd say it's fine. Rod journal.... I'd at least polish it. I'm assuming that this thing isn't going to have a hard life.... You need to address it, but I don't think it will "kill" it.
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Old 12-28-2015, 11:03 PM
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id say its junk, im not even sure you could polish it once its been blasted. you could have it cut but then you'll be looking for undersized bearings.
Bearings for motors that old usually have to be made anyway. It's not as expensive as you might think.
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Old 12-28-2015, 11:11 PM
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The crankcase came with bearings installed along with lined bored.
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Old 12-28-2015, 11:15 PM
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The crankcase came with bearings installed along with lined bored.
so they cared enough to line bore it but then they blasted the rod journal?
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Old 12-28-2015, 11:17 PM
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When I posted I didn't see any pics. I do now.

I'm confused.... did you remove the crank from the block? Split block? I'm familiar with Fairbanks Morse and older IH...bigger motors than the Maytags.

That rod journal needs ground.... maybe welded and ground.

Post some more pics. Why did they line bore it....? Are the blocks bad about warping? Or are the bearings installed then line bored. Some older motors that's just how you do it....
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Old 12-29-2015, 08:45 AM
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I believe it is a little hit N miss, poured Babbitt bearing engine.
so prolly just polish the journals with crocus and when you set up the clearance with shims it will be just fine.
they just don't run all that fast.
As long as the crank is not bent or journals out of round, it should be ok.
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Old 12-29-2015, 10:12 AM
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I believe it is a little hit N miss, poured Babbitt bearing engine.
I figured it was a poured bearing. I also assumed it was a shimmed rod, but didn't know for sure. I'm with you. It will probably be fine if you polish it up.
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Old 12-29-2015, 12:13 PM
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Maybe they sent you an unfinished crank by mistake?
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