 901 bearing races...., How loose is too loose? Brad? |
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| bondo |
 Sep 17 2004, 12:33 PM
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#1
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Practicing my perpendicular parking  Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California  |
It's getting close to time to start taking apart transmissions so I can get at least one good one out of the bunch. I know there's been talk of loose bearing races in the case, but I don't know how tight they should be or how loose they can be before it's a problem. Is it a press in fit, or drop in with no noticable wiggle? Or do I need to measure it with some sort of expensive equipment? (all I have are digital calipers and a dial guage)
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| bondo |
Sep 17 2004, 09:52 PM
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#2
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
Bump? (IMG:style_emoticons/default/icon_bump.gif)
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| Red-Beard |
Sep 17 2004, 10:01 PM
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#3
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"Ya canna change the laws of Physics" Group: Benefactors Posts: 1,124 Joined: 11-February 03 From: Houston, TX Member No.: 288 Region Association: None  |
QUOTE --Royce DAPO Auto Repair "We screw up your car so you don't have to." LMAO! Wayne - it needed at least 102 projects... |
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| sgomes |
Sep 17 2004, 10:44 PM
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#4
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Electric Member Group: Members Posts: 815 Joined: 6-May 04 From: Campbell, CA Member No.: 2,029 |
I'm only an expert in paying for things but as someone who is paying for loose bearing races I'll put in my 2cents.
Something that is pressed in shouldn't move at all! So, if you can move it then you're in trouble. Mine you could reach three fingers or so inside the race and twist it pretty easy. It kinda made that familiar sound that almost everything else on the car makes... "cha-ching".... $$$$ (IMG:style_emoticons/default/laugh.gif) |
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| bondo |
Sep 18 2004, 11:02 AM
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#5
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
QUOTE(sgomes @ Sep 17 2004, 09:44 PM) I'm only an expert in paying for things but as someone who is paying for loose bearing races I'll put in my 2cents. Something that is pressed in shouldn't move at all! So, if you can move it then you're in trouble. Mine you could reach three fingers or so inside the race and twist it pretty easy. It kinda made that familiar sound that almost everything else on the car makes... "cha-ching".... $$$$ (IMG:style_emoticons/default/laugh.gif) Thanks, that's pretty much what I wanted to know. I didn't know if it was supposed to be a press fit, as I have never seen a known good one. |
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| silver2.0 |
Sep 18 2004, 02:37 PM
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#6
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Member Group: Members Posts: 61 Joined: 25-February 04 From: Fairfield, WA (spokane area) Member No.: 1,715 |
Your best bet is a micrometer and a telescoping gage. A good general rule of thumb for most bearings is .0005"+/-, depending on the bearing. If you have .001 clearance, a bearing will tap on with little resistance usually if the surface finish is good. Any less and you need to warm it up to at least 200 degrees F. .002" clearance, and the bearing will slide on by hand easily. You rarely have an interference fit of more than .0005, becuase the bearings start to bind, unless they are specifically designed for this purpose. Hope this gives you a few ideas.
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| bondo |
Sep 18 2004, 09:31 PM
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#7
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
I believe the fit in the case is fitting the bearing race into a machined pocket in the case.. so i'd either have to freeze the bearing or heat the case. But that doesn't really matter as I don't think there has ever been a problem with it being too tight, just too loose. If I find that all my cases are loose, I'll try and borrow a telescoping guage and micrometer to find the best one (if it isn't obvious).
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