how much axial play do you have on the front CV joints? - Bimmerfest - BMW Forums



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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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Old 04-24-2019, 05:15 AM
deroy deroy is offline
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how much axial play do you have on the front CV joints?

I'm still (part time) chasing my low impact, mild, front end cluncking. It's not spectacular, nothing obvious like bushings, not the orange strut bushings, and not getting worse, but still a background frustration. It's not the play I had in the rides height sensor rods with ball joints which I replaced recently, at $20 a side and 10 min work only. Was worth the try, but did not change it.

I found out there is some axial play on the front outer CV joints. 1-2 mm I'd guess. If I wiggle it back and forth, it think it could be the clunck I hear. I thought the axial play that is required in the suspension is supposed to be accommodated by the inner joint, not the outer.

How tight are your outer front CV joints axially?
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Old 07-03-2019, 01:00 PM
deroy deroy is offline
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Bump.

I’ve checked every front suspension component multiple times by now. But this really seems the only one with play and makes my metallic clunk.

Please guys, I need reference ‘measurements‘ from you. Next time you approach your X5, just bend down and feel for axial play on your front outer cv joints on the drive shafts.


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Old 07-17-2019, 01:56 AM
deroy deroy is offline
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Bump.

Also: how long is CV joint grease supposed to last? Boots are still perfect, car is from '07 and has 165k miles in moderate climate NW Europe

I could imagine old, less viscous grease allows more play and clunking than fresh, sticky grease. Regreasing might well be possible while the axle is still on the car.

Last edited by deroy; 07-17-2019 at 02:23 AM.
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Old 07-17-2019, 03:17 AM
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Two different types of CV joint are used on the front output shafts. At the inner end a Tripod Joint is used for its significant accommodation of axial movement. At the outer end a Rzeppa Joint is used for its significant accommodation of axial displacement - typically 45° and up to 54°

They are lubricated with molybdenum disulfide grease MoS2 sealed with hermetic gaiters. Dry molybdenum disulfide is an adequate anti-friction agent without its typical carrier. While the gaiters are intact there needs to be no provision for re-greasing.

https://www.newtis.info/tisv2/a/en/e...-shaft/GcurtC8
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Old 07-17-2019, 04:15 AM
deroy deroy is offline
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Quote:
Originally Posted by Doug Huffman View Post
While the gaiters are intact there needs to be no provision for re-greasing.
I know the theory as well as you do.

I have axial play (that should or should not be there?). I also see movies with 'grease' gushing out of opened up gaiters like water, and fresh grease looking like... grease.
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Old 07-17-2019, 05:01 AM
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Doug Huffman Doug Huffman is online now
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Gaiters with water gushing from them when opened are not intact, and must be replaced after cleaning the joint and replacing the lubricant. Typically the outboard gaiter fails first for its much higher stresses.

Depending on the compounding composition of molybdenum disulfide lubricant it may not be 'grease', as oil filled lithium soap, at all. The semi-fluid carrier for the MoS2 may be any number of stuff.
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Scepticism and Animal Faith (1923)
Scepticism is the chastity of the intellect, and it is shameful to surrender it too soon or to the first comer: there is nobility in preserving it coolly and proudly through long youth, until at last, in the ripeness of instinct and discretion, it can be safely exchanged for fidelity and happiness.
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Eschew eristical argumentation. I am responsible for what I write, not for your understanding of it.
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Old 07-17-2019, 10:09 AM
deroy deroy is offline
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Sigh.

LIKE water.

If you really want to help, please check the axial play on yours.


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Old 07-29-2019, 07:50 AM
deroy deroy is offline
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Update: swapping the old Dueler HP runflats for fresh Michelin non runflats made the clicking a LOT less. Most bumps are now absorbed by the tyre sidewalls apparently, and not anymore by whatever part is/was clunking.
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