I changed the driveshaft CSB on my car yesterday. I marked the phasing of the two halves before I disassembled it, but greasy hands plus manhandling the shaft trying to get the threaded lock collar off means that marks came off. Is there any way to determine how it was phased before to prevent vibration, or will I have to have it balanced?
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The Homer: Powerful like a gorilla, yet soft and yielding like a Nerf ball. -
It should be fine,(very little to no vibration) just remember to preload the CSB
I didnt mark the past 2 that i have done than they turned out fineDan Zickel
1995 M3, 1991 318iS, 1987 325iS
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Called four different driveshaft places around town and only one is willing to balance it, although reluctantly. All of them want to do an exchange, but I don't want to spend $300+ on a driveshaft for a $400 car.The Homer: Powerful like a gorilla, yet soft and yielding like a Nerf ball.Comment
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Most likley it isnt that unbalanced... have you driven it?Dan Zickel
1995 M3, 1991 318iS, 1987 325iS
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No I haven't driven it, but this is going on a race car that will be driven for probably 14 hours straight. I don't want to chance it.The Homer: Powerful like a gorilla, yet soft and yielding like a Nerf ball.Comment
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There's a welder here.... I'll balance it myself ;)
-VinceComment
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If the cause of the CSB replacement was a failure of the rubber mount, it is almost a certainly that you need to replace the drive shaft. In almost all cases, that failure mode is caused by binding u-joints in the drive shaft.The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, ALComment
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I just did mine and had the same problem. My driveshaft came with 2 white dots painted by the factory on either side of the center bearing. Look for them.Comment
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FYI I just replaced the CSB and guibo as a preventative measure. Like I said, this is a $400 car that we are converting to compete in a 14 hour race, so changing them was cheap insurance IMO.
ecniv has the driveshaft right now and he said there are two yellow marks on either side of the center U-joint (one on each half of the shaft). Would those be the factory marks? If so, I might be saved yet.The Homer: Powerful like a gorilla, yet soft and yielding like a Nerf ball.Comment
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Went back today and looked at the driveshaft and found the two factory white dots. I'm saved!The Homer: Powerful like a gorilla, yet soft and yielding like a Nerf ball.Comment
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I have to change my CSB tomorrow. There is no rubber left in it its just the bearing bouncing around in the bracket...1985 325e 2.8 Turbo VEMSComment
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In almost all cases, that failure of the CSB results from binding u-joints in the drive shaft. So in addition to the CSB you need a replacement or rebuilt drive shaft.The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, ALComment
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I changed mine and I didn't put it back together with the phasings right and its vibrating a tiny bit, i'm going to throw it up on a hoist soon and check for the white marks from the factory..
Where should they be?1985 325e 2.8 Turbo VEMSComment
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