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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > All-Wheel-Drive (Xi / xDrive) Talk > Common CV boot problems



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      07-15-2009, 05:22 PM   #1
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Common CV boot problems

330xi 06. Does anyone had problem with there cv boot going bad?
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      07-15-2009, 05:28 PM   #2
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I may have a leak. not sure yet. That bronze looking collar is loaded with an oily substance. May be CV seal leak.

Car won't go in until 7/28
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      07-16-2009, 08:35 AM   #3
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I think its suppose to be greese up, to prevent it from going bad. Correct me if im wrong.
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      07-16-2009, 08:50 AM   #4
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Quote:
Originally Posted by bmystic View Post
I think its suppose to be greese up, to prevent it from going bad. Correct me if im wrong.
yes the cv boot is supposed to be filled with a special grease. over time the boot dryrots and the grease begins to come out, the biggest cause of the joint going bad is not lack of grease, but the dirt getting into the boot.
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      07-16-2009, 08:52 AM   #5
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Quote:
Originally Posted by tomob63 View Post
I may have a leak. not sure yet. That bronze looking collar is loaded with an oily substance. May be CV seal leak.

Car won't go in until 7/28
is that collar oily? it looks to me like condensation from the a/c system, if its not oily its just the water dripping from the ac system sweating and is rusting that collar
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      07-16-2009, 12:44 PM   #6
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Originally Posted by sexye92 View Post
yes the cv boot is supposed to be filled with a special grease. over time the boot dryrots and the grease begins to come out, the biggest cause of the joint going bad is not lack of grease, but the dirt getting into the boot.
Whats the best way to prevent the boot from dryroting?
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      07-16-2009, 12:47 PM   #7
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Whats the best way to prevent the boot from dryroting?
nothing really, i guess if you wanted to be real anal about it you could try like armor all or something on it. the problem is the rubber is subjected to the engine heat, anything that leaks from the car (oil, antifreeze, gas) and also exposed to those from the road, and salt. they normally last a long time without any treatment
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      07-16-2009, 02:24 PM   #8
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Quote:
Originally Posted by sexye92 View Post
is that collar oily? it looks to me like condensation from the a/c system, if its not oily its just the water dripping from the ac system sweating and is rusting that collar

Yep, collar is oily. The opposite side is not. Watched an oil line grow on the collar over a two week period. Now it's covered. Not sure of source. Going to get it checked out in a couple weeks. Long wait for loaner
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      07-22-2013, 06:42 PM   #9
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My CV boot just went out.. I guess it's common with 330xi's. Anybody have more info on this? Bumped because don't think I should start a new thread for this.
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      08-10-2013, 01:17 PM   #10
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My CV boot just started making some funny noises when i turn slowly. At least i think thats what it is. I havent had a chance to take a look at it yet.
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      11-21-2013, 12:48 AM   #11
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      08-18-2015, 04:11 PM   #12
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How much does it cost to repair at the shop? It looks like a lot of work to do on my own.
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      09-11-2015, 03:50 PM   #13
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How much does it cost to repair at the shop? It looks like a lot of work to do on my own.
I've been looking into the cost, too, as I suspect my cv joint might be drying up. Looks like its about 2-3 hours labor each side, parts range from $10 ea boot kit (aftermarket) to $40-50 ea boot kit (oem). There are 4 boots total, although most search results point to outer boot going bad more often than the inner (I know for a fact I saw my inner boot twisted when installing struts). I plan on having all 4 boots replaced at local bmw indy, that's if my cv joints are even still good...

Also, this as a DIY does look pretty difficult if you aren't experienced (I'm not).
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      09-11-2015, 06:15 PM   #14
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That OP picture looks like oil leak from axle-differential seal. The CV joint has grease, and so thicker than oil and I don't think it will "leak" unless the boot is torn somewhere in its folds.
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      09-14-2015, 09:37 AM   #15
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Quote:
Originally Posted by bmystic View Post
Whats the best way to prevent the boot from dryroting?
Use a rubber moisturizer/treatment. You can try 303 aerospace.

120k on my 330xi cv joints. All boots are fine and have no signs or cracking/dry rot.

I'm lowered as far as I can go on H&R coilovers as well since 82k miles.

Typically when the boot tears, grease is slug all over the wheel well. It's not oil, it's grease packed.
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