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Chamfering bearings

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Old Oct 2, 2016 | 07:05 PM
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Default Chamfering bearings

Has anyone here chamfered a set of their bearings to clear the crank fillet? If so, how did you do it?
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Old Oct 2, 2016 | 07:28 PM
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From: JunkYard
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They sell narrowed bearings if that's what you're after.

There are ways it can be done if needed.

Some do it by hand.
Some make a small fixture in a lathe and turn them as needed.
Some use the big end of an old rod to hold the bearing and machine as needed in a lathe or on a mill with a rotary table.
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Old Oct 2, 2016 | 07:33 PM
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I don't have access to a lathe and this would be in a situation where I could not get a narrowed bearing.


How are people doing it by hand and keeping it uniform
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Old Oct 2, 2016 | 07:42 PM
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From: JunkYard
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You would have to scribe a line from the edge of the bearing and likely use something like a bearing scraper to do so. You can file and or sand it as well but you really need to protect the surrounding area so you don't embed material into the bearing.
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Old Oct 2, 2016 | 07:50 PM
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From: JunkYard
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I only found a squaring tool to hold them in a lathe. If you look up "ROD or MAIN BEARING CHAMFERING TOOL" on Ebay you will see what I mean.

A bearing scraper can be purchased through Goodson tools
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Old Oct 2, 2016 | 07:52 PM
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I know what the lathe tool is. How much of a chamfer is usually added on mains and rods?
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Old Oct 2, 2016 | 07:58 PM
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From: JunkYard
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That I can not answers as I myself have personally never done it.

Maybe KCS or someone else on here can answer.

I believe it would depend more on the chamfer on the journals of the crankshaft.
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Old Oct 3, 2016 | 09:17 AM
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From: Conroe, TX
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The fillet radius on the aftermarket cranks are usually about .125". You would need to cut at least that much plus clearance.

If I were forced to do something like this, I would probably put the shells together on a flat surface and tighten a hose clamp around them. Then use something like this chamfer router bit chucked up in a hand held drill to cut the chamfer. Just make sure you cut the right side.

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