How much carrier bearing preload

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Bob Hollinshead
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How much carrier bearing preload

Post by Bob Hollinshead » Mon Sep 12, 2016 7:57 am

GM 9.5" 14 bolt rear differential, This has the adjuster on the right side of the housing. How do I know where to set this adjustment? Bring the adjuster in for a snug fit then how much more?
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Bob Hollinshead
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Re: How much carrier bearing preload

Post by Bob Hollinshead » Wed Sep 14, 2016 9:27 am

35 views and no comments LOL, I could spread the case .010 I guess and run the adjuster up snug? But there must be some easy rule to go by
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BigBlocksOnTop2
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Re: How much carrier bearing preload

Post by BigBlocksOnTop2 » Wed Sep 14, 2016 9:06 pm

I have done a 9'' for myself with the same bearings (used). I set the pinion at 12 inch pounds (the amount of torque to keep rotation). Then I set the carrier preload until I recorded 24 inch pounds, rotating the pinion. Twelve in.lbs. for the pinion and 12 in. lbs. for the carrier. These same numbers would work for you to. The reason why I reset my diff. is because it was set up for circle track racing and it was loose. It was an E-Bay purchase.

Bob Hollinshead
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Re: How much carrier bearing preload

Post by Bob Hollinshead » Wed Sep 14, 2016 10:10 pm

with used bearings 24" lbs. might be right? maybe 30% more with new bearings? I read one writeup that suggested moving the right side adjuster three notches past snug.
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peejay
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Re: How much carrier bearing preload

Post by peejay » Thu Sep 15, 2016 8:28 pm

On 9" I haven't had problems with going two adjuster holes tighter than just barely snug. Not sure if that's too loose or too tight but it hasn't failed me yet.

Bob Hollinshead
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Re: How much carrier bearing preload

Post by Bob Hollinshead » Fri Sep 16, 2016 1:10 am

good to know!
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Dan Timberlake
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Re: How much carrier bearing preload

Post by Dan Timberlake » Sat Sep 17, 2016 9:42 am

http://www.pirate4x4.com/tech/billavist ... le/14b.pdf

On page 6-101 This also suggests 2 notches tight with used bearings and 3 notches tight for new bearings.
Reportedly gleaned from factory and military manuals.

peejay
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Re: How much carrier bearing preload

Post by peejay » Sun Sep 18, 2016 8:16 pm

Good to know! Now I don't feel too bad about the ones where I went three holes out when I was trying to get backlash just right and didn't want to back off the other side...

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