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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Mon, Jul-02-2018, 04:50:55 PM   #1
Mindart
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Default CSB preload?

installed drive shaft in car last night....

When i broke the dive shaft down I reference marked it near the splines as I know it is balanced

I did not reference the final drive or transmission output flange to the drive shaft ... which is fine right?

Lastly, the pre load.... I just moved the CSB towards the front of the vehicle about a .25 inch and then tightened it down. I made my best effort to be sure all seemed to be centered in the tunnel. I don't think its perfect but pretty close.

every time i went to tighten the CSB down it seems to suck it slightly more to one side that the other... maybe its a 1/8inch- off at most?

thanks!

Last edited by Mindart; Tue, Jul-03-2018 at 01:16:59 PM.
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Old Tue, Jul-03-2018, 01:17:22 PM   #2
Mindart
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Default Re: CSB preload- just double checking

Bump

Anyone?
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Old Tue, Jul-03-2018, 03:05:21 PM   #3
BMWManiac
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Default Re: CSB preload?

Quote:
Originally Posted by Mindart View Post
installed drive shaft in car last night....

When i broke the dive shaft down I reference marked it near the splines as I know it is balanced

I did not reference the final drive or transmission output flange to the drive shaft ... which is fine right?

Lastly, the pre load.... I just moved the CSB towards the front of the vehicle about a .25 inch and then tightened it down. I made my best effort to be sure all seemed to be centered in the tunnel. I don't think its perfect but pretty close.

every time i went to tighten the CSB down it seems to suck it slightly more to one side that the other... maybe its a 1/8inch- off at most?

thanks!
You don't need to reference the transmission or diff flanges for the driveshaft, just the driveshaft halves themselves. Yes, all you have to do to preload is just like you did. Make sure both sides are installed to the trans/diff (proper length, it shouldn't slide out from either trans/diff) and then loosely bolt CSB to chassis. slide the CSB as far forward as possible and bolt it down. .25" sounds about right.

I wouldn't worry about it, sounds like you did it right. When you drive, do you notice any new issues or vibrations?
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Old Tue, Jul-03-2018, 03:19:52 PM   #4
Mindart
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Default Re: CSB preload?

I figured it was fine.... I haven't driven it yet because I am slow to put it back together... that's all i had time to do the other day

my sequence was bolting the guibo end up, then the final drive end up and lastly i preloaded the bearing

everything seems to rotate smoothly and be aligned as good as i can get it

I had referenced marked my old CSB before i took it out so the new one pretty much sits where the old one was



Quote:
Originally Posted by BMWManiac View Post
You don't need to reference the transmission or diff flanges for the driveshaft, just the driveshaft halves themselves. Yes, all you have to do to preload is just like you did. Make sure both sides are installed to the trans/diff (proper length, it shouldn't slide out from either trans/diff) and then loosely bolt CSB to chassis. slide the CSB as far forward as possible and bolt it down. .25" sounds about right.

I wouldn't worry about it, sounds like you did it right. When you drive, do you notice any new issues or vibrations?
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Discussing CSB preload- just double checking in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)