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Registered
Join Date: Jul 2007
Location: Ontario
Posts: 22
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915 differential bearing preload problem
I have replaced the FAG carrier bearings in my friends '79 915. When I try to measure the preload with my pointer type torque wrench the bearings don't turn evenly ie. it feels like bump, bump bump with every roller and the needle of my wrench swings about 10 in./lb.s. with each bump. Bearings were installed completely dry - should they have a little lube? Reading (near as I can tell) is in the right range of 50 in./lb.s. Is this jerky reading normal? What would cause the unevenness? There are many threads on differential preload but I did not see this unevenness addressed.
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11-12-2020, 06:05 AM
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Registered
Join Date: Sep 2015
Location: Costa Rica and Pennsylvania U.S.
Posts: 3,301
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carrier bearings
Fag bearings have always been 25 inch lbs.SKF is a much better bearing and the spec is 35 inch lbs.I have always used 40 inch lbs.if the car sees some track use or has higher horsepower.Where did you come up with 50 for a spec?Fred
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11-12-2020, 06:18 AM
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Join Date: Jul 2007
Location: Ontario
Posts: 22
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I believe I got that number from Peter Z's tutorial
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11-12-2020, 07:44 AM
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Join Date: Jan 2015
Location: Stow, MA
Posts: 578
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The "stiction" you're experiencing is normal, and is a nuisance when setting them up. Clean the bearings thoroughly with solvent, then lubricate with transmission lube. Problem should go away. Yes, the bearings should always be set up lubricated.
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Kevin Catellus Engineering catelluseng@gmail.com http://www.catellusengineering.com https://www.facebook.com/catelluseng/ |
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11-12-2020, 09:25 AM
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Join Date: Jul 2007
Location: Ontario
Posts: 22
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Thanks Kevin. That is what I needed Dennis
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11-12-2020, 10:53 AM
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