Re: Bearings and fingerprints
[Re: Moparnut426]
#199516
01/20/09 10:09 PM
01/20/09 10:09 PM
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Joined: Jan 2003
Posts: 6,392 nielsville, minn.
quickd100
master
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master
Joined: Jan 2003
Posts: 6,392
nielsville, minn.
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I just wash them, oil'em and install them.(After checking clearances.) About a thousand years ago when I was an Apprentice Millwright, our bearings and drives instructor, (he owned a bearing house and was as good a bearing man as I've ever met) told us a little story. It seems one of the bearing manufacturers of anti-friction ball bearings, (SKS, Bower, Timkin) once in a while would get a complaint about rusty fingerprints on their new unused bearings. Their engineers were pulling their hair out trying to figure out why it only happened sporaticly. Finally after a long exhaustive study they figured it out. They hired women to wrap and package the bearings. Once a month as each women went into their menstrual cycle their sweat became more acidic which stained and etched the bearings. To solve the problem they begain requiring everyone on the packaging line to wear gloves. Dave
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Re: Bearings and fingerprints
[Re: Moparnut426]
#199519
01/20/09 11:26 PM
01/20/09 11:26 PM
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Joined: Nov 2005
Posts: 15,119 85086
moparpollack
Lil Herman
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Lil Herman
Joined: Nov 2005
Posts: 15,119
85086
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I know in jet engines finger prints are a problem on the ball bearings. At over 10,000 rpms the prints contain salt and acids that caused galling and ruined the bearings and the race. There was a finger print remover that they used. So myth proven no BS.
56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
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Re: Bearings and fingerprints
[Re: RonP]
#199523
01/21/09 09:58 AM
01/21/09 09:58 AM
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Joined: Jan 2003
Posts: 8,547 State College, PA
RyanJ
moparts member
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moparts member
Joined: Jan 2003
Posts: 8,547
State College, PA
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Any layered clevite style bearing taken out of package & left out in air without oil or something protective on it can deteriorate. I've had a bunch sit out just maybe for a few weeks out of package in summer when humidity is in the 50's or higher in the shop & bearings will be ruined. That's why I never take them out of protective wrapping until I'm ready to use them, & I have mock up bearings that I keep lubed that sit around exposed.
So it wou;d'nt surprise me if the acid from your prints if left on a bearing that did'nt go into a motor could do some damage over time especially in a humid environment, the acid can actually draw in moisture to the bearing & start it to rust etc. Same deal on my car right now it has been in bare steel for like 6+ months... it does not rust anywhere except if you put your hands on it somewhere & leave fingerprints or a palm print etc after a while they will start to show up..... so my car has little rusty fingerprints & palm prints on it in certain areas. Anywhere I never touched with bare hands since stripping it to steel, it is still as clean as day I stripped it..... humidity etc never affected it.
Most people who are touching bearings are going to be putting them in the engine within at least a few hours, & tehy're gonna be doused in some type of lube which will wash away the very minute acid from the skin....So I do not worry about touching the shell of the bearing when I'm handling them (not that you really need to be handling the shell itself, usually I'm touching the edges only when holding a bearing or installing) But I do believe as I said if you leave them sit out for long time after touching them they can get ruined without some type of lube on them.
I don't think this would much apply to a King or Federal bored aluminum bearing, just Clevite type layered bearings.
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Re: Bearings and fingerprints
[Re: RyanJ]
#199525
01/21/09 10:13 AM
01/21/09 10:13 AM
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Joined: Mar 2006
Posts: 9,910 Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
Any layered clevite style bearing taken out of package & left out in air without oil or something protective on it can deteriorate. I've had a bunch sit out just maybe for a few weeks out of package in summer when humidity is in the 50's or higher in the shop & bearings will be ruined. That's why I never take them out of protective wrapping until I'm ready to use them, & I have mock up bearings that I keep lubed that sit around exposed.
So it wou;d'nt surprise me if the acid from your prints if left on a bearing that did'nt go into a motor could do some damage over time especially in a humid environment, the acid can actually draw in moisture to the bearing & start it to rust etc. Same deal on my car right now it has been in bare steel for like 6+ months... it does not rust anywhere except if you put your hands on it somewhere & leave fingerprints or a palm print etc after a while they will start to show up..... so my car has little rusty fingerprints & palm prints on it in certain areas. Anywhere I never touched with bare hands since stripping it to steel, it is still as clean as day I stripped it..... humidity etc never affected it.
Most people who are touching bearings are going to be putting them in the engine within at least a few hours, & tehy're gonna be doused in some type of lube which will wash away the very minute acid from the skin....So I do not worry about touching the shell of the bearing when I'm handling them (not that you really need to be handling the shell itself, usually I'm touching the edges only when holding a bearing or installing) But I do believe as I said if you leave them sit out for long time after touching them they can get ruined without some type of lube on them.
I don't think this would much apply to a King or Federal bored aluminum bearing, just Clevite type layered bearings.
But the ones we are talking about came out of the box brand new.And let me caution people that use lacquer thinner on layered bearing. The layers have their own lubercating qualities and pliability qualities,such as found in babbit,aluminum,brass and copper and other non ferris materials.The lacquer thinner penatrates and dries and can cause premature failures.
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Re: Bearings and fingerprints
[Re: 446acuda]
#199527
01/21/09 12:07 PM
01/21/09 12:07 PM
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Joined: Mar 2006
Posts: 9,910 Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
I did jet engine ball bearing inspection for Uncle Sam years ago and part of the process was dunking the bearing in "finger print remover" before packaging it up. There must be something to it. I don't remember what chemical the finger print remover actually was and didn't smell like any familiar chemical .
There is,I dunked my fingers a few time and used a sented hand cleaner to get that familar smell off them. That didn't come out the way I intended But it certainly saved my butt a few times
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