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08-29-2018, 12:48 PM | #1 |
Senior Member
Join Date: Apr 2015
Location: Saint Cloud Mn
Posts: 745
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Engine center bearing
I have a model "A" with the center bearing breaking up into small pieces about 3/16 by 3/16 kind of like flakes. These pieces managed to get between the good babbit and the crank pretty much preventing the engine from turning. Any help on what could be the cause?
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08-29-2018, 01:18 PM | #2 |
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Join Date: May 2010
Location: Oregon
Posts: 5,993
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Re: Engine center bearing
Bad babbit or bad lubrication.
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08-29-2018, 01:43 PM | #3 |
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Join Date: May 2010
Location: on the Littlefield
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Re: Engine center bearing
Crummy Babbitt---- cook too long, cook too hot, reusing old Babbitt
Take a sample and bend it, original Babbitt bends a ways before breaking, old reused overcooked Babbitt shatters Not peined gets pounded, too brittle to conform, Dirty pour, then blow holes filled with solder |
08-29-2018, 09:55 PM | #4 |
Senior Member
Join Date: Apr 2015
Location: Saint Cloud Mn
Posts: 745
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Re: Engine center bearing
I thought I read somewhere that certain engine loads could be damaging to main bearings. I this just a fairy tale or is there some truth to this.
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08-29-2018, 09:59 PM | #5 |
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Join Date: May 2010
Location: Oregon
Posts: 5,993
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Re: Engine center bearing
Good babbit with proper oiling, cooling and clearance can take the load. Lugging the engine can lead to a broken crankshaft.
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08-29-2018, 11:41 PM | #6 |
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Join Date: Apr 2011
Location: Wimauma, Florida
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Re: Engine center bearing
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08-30-2018, 12:40 AM | #7 | |
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Join Date: May 2010
Location: 60615,330th Ave.,Clare, Iowa, 50524
Posts: 1,457
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Re: Engine center bearing
Quote:
One thing about the center main. once it has wore loose, and you reset shims, and clearance, and the front and rear was taken up much less, the crank now is out of Alignment, in the center main, and there is always one side of the crank that is exerting more pressure, then anywhere else, on the rest of the main journal. The force is coming from the flywheel trying to bring the main journals back to a straight line. This can't be done, so the center main pushes hard in one spot, circling the center main, pushing, and cleaning the oil ahead of the tight spot, and robbing the rest of the crank, and main of oil. So with out a protective oil film, the top surface say .010 of the bearing builds heat, and softens, and if it doesn't take the main clear out, the now rotten surface babbitt, will flake, because it has melted it loose, and welded back on, but very poorly. Herm. |
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08-30-2018, 12:48 AM | #8 |
Senior Member
Join Date: May 2010
Location: 60615,330th Ave.,Clare, Iowa, 50524
Posts: 1,457
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Re: Engine center bearing
Think of it like someone repeatedly picking you up and just shaking your body up-and-down and all around. " END QUOTE "
My Girl friend does that to me when she is out of Cigarettes, and looking for quarters! Herm. |
08-30-2018, 07:23 AM | #9 |
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Join Date: Apr 2015
Location: Saint Cloud Mn
Posts: 745
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Re: Engine center bearing
Herm that is what I was looking for. This is babbit possibly original. Someday when I have the patience I will figure out the picture thing but for now this is what I have found. The crank is standard with little wear however the mains have about 1/2 thousands taper and 1/2 to 1 out of round. Someone has been into this thing. It looks like they tried to re-melt something back into the bearing "babbit or whatever". A lot of work to save a lot of money but a failure. Daren
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08-30-2018, 10:29 AM | #10 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: Engine center bearing
You need to shake her up for smoking. LOL
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