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Thread: Leaking CV Boots

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    KS-CS's Avatar
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    Question Leaking CV Boots

    My right-sided, outboard CV boot has started to leak a small amount of grease; I recently had the left-sided boots replaced by the dealer (at some expense, because the outer boot was leaking on that one as well). The arrow on the picture below indicates that the grease just appears to be leaking at the end of the boot before the bearing housing. There doesn't appear to be any tear in the boot itself, and there doesn't appear to be any easy way to tighten the retaining bands on the boot, or make the seal against the housing any tighter.

    When I took my car into the dealer for the left-sided leak, they told me that the high lateral g-forces on the track were probably causing the problem by forcing small amounts of grease out through the end seam. They felt the only way to fix it was by replacing with a new boot which would fit tighter on the axle.

    With all the 987s on the track, I'm surprised that I can't recall seeing this problem reported before. Has anyone else faced this issue, and if so how did you deal with it? Any other recommendations?
    Attached Thumbnails Attached Thumbnails Leaking CV Boots-cvboot.jpg  
    Last edited by KS-CS; 11-11-2011 at 10:25 AM.


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    Re: Leaking CV Boots

    You probably know more about this than I do. However, I would be very skeptical that lateral g of less than 1 would cause the leak you describe. I would be more inclined to believe that the dealer wanted some work to do, wanted to stop the leak, wanted to replace the left boot, and didn't really know the cause.
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    Re: Leaking CV Boots

    I too tend to think the G force business is BS... Are you sure you can't tighten the clamp? It should be one of two types... crimp, in which case you might be able to "extra crimp", or screw down, which obviously you could alter

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    Re: Leaking CV Boots

    Mine leak and I know my mechanic tried to tighten them but couldn't, I just live with it. The grease is a PIA to clean too.

    Edit: I'm not sure where they leak, I just know grease drips on the inside of the wheel during DEs, it used to drip a little all the time.
    Last edited by DMN987S; 11-11-2011 at 03:46 PM.

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    Re: Leaking CV Boots

    Why not cut the bands off and replace them with ones you can tighten?

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    Re: Leaking CV Boots

    As suggested those band clamps can be replaced, but I'm not sure you'll see an improvement. If you cut the existing clamp and try to clean the sealing surfaces I think you find it nearly impossible, but you might be able to get a new clamp just a bit tighter or at least enough to make a better seal. And then again you could get the clamping tool and try to get a tighter fit.
    This tool looks decent:

    Amazon.com: Lisle 30800 CV Boot Clamp Pliers: Automotive

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    Re: Leaking CV Boots

    There has been a discussion on the Cayman Register on this topic as well, and a couple of people there have reported some success at removing the existing clamps, cleaning the axle surfaces and repacking the boot with new grease, and placing new clamps (which do require a special CV boot clamp tool). The alternative is removing and replacing the boots with new ones (it is usually recommended to replace both the inner and outer boot if you are removing the axle anyway) - a much more laborious (read: $$$) procedure.

    It appears that this may not be a rare problem among those of us who track our cars; the common wisdom thus far is that the sustained high temps around the outer boots (e.g. from hot brake rotors, exhaust pipe, etc) tends to liquify the lithium grease more, and this perhaps combined with the high lateral g's tends to force some of the grease out through the end of the boot.

    In any case, placing new clamps is probably just a temporary fix for those who regularly track their cars.

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    Re: Leaking CV Boots

    Resurrecting an old thread here. I was wondering if others have experience with DEs and leaking drive shaft seals. Just completed two wonderful days at Road America, and following the last session of the last day was parked in the paddock with engine idling to keep the water pump and fans running when after about three minutes suddenly a gush of lubricant like thick oil came pouring out of the left rear wheel hub area. I'm no expert, but my guess is it's due to leak in the drive shaft seal. I was able to drive home (about 150 highway miles) with no further detrimental effect - no strange smells, grinding noises, etc. So I'm trusting that I can drive the car to the repair shop without too much issue - not as if all the oil had drained from the differential, for example, right? (I know from experience that if you drive a couple miles with no differential oil the diff becomes toast.)

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    Re: Leaking CV Boots

    FOLLOW-UP:

    I recently repacked and replaced the clamps on one of my CV boots which was leaking quite a bit. I documented the procedure in an Article here:
    Repacking and clamping CV Boots - Articles
    Jeff_07S likes this.

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    Re: Leaking CV Boots

    Great write up! I'll be trying to do the same. One of my boots is leaking, and I've never driven on the track. I think all the commuting driving during summer temps will liquify the grease just the same.

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    Re: Leaking CV Boots

    Is there a part number for the larger adjustable clamp?

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    Re: Leaking CV Boots

    Quote Originally Posted by Jeff_07S View Post
    Is there a part number for the larger adjustable clamp?
    The official OEM part # is 996-332-957-00 which is supposed to fit 70-74mm, however I found it to be too large. The one I bought from my local dealer isn't an official Porsche OEM part, so I'm not sure who makes it. Others have posted using the following successfully Oetiker CV68 CV Clamp.

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    Re: Leaking CV Boots

    Worm gear type hose clamp works very well.

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    Re: Leaking CV Boots

    There are also the belt-type of bands that are one size fits all and use a tool you put a ratchet on to tighten. I'm a big fan of that type.

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    Re: Leaking CV Boots

    I used these EMPI CV Boot Clamps Amazon.com: EMPI CV Boot Clamp: Automotive
    Leaking CV Boots-41cqeoi0ahl.jpg

    with this OTC 4623 CV Joint Banding Tool And Cutter OTC 4623 CV Joint Banding Tool And Cutter : Amazon.com : Automotive
    Leaking CV Boots-61e4j6elecl._sl1500_.jpg

    I was generally satisfied with it but I never felt like it was tight enough. I broke one of the clamps when tightening but it may have been good enough.

    Louis

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    Re: Leaking CV Boots

    I saw "67" stamped on the large clamp on my car. My guess is 67mm is the size

    Quote Originally Posted by KS-CS View Post
    The official OEM part # is 996-332-957-00 which is supposed to fit 70-74mm, however I found it to be too large. The one I bought from my local dealer isn't an official Porsche OEM part, so I'm not sure who makes it. Others have posted using the following successfully Oetiker CV68 CV Clamp.

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    Re: Leaking CV Boots

    Quote Originally Posted by Jeff_07S View Post
    Great write up! I'll be trying to do the same. One of my boots is leaking, and I've never driven on the track. I think all the commuting driving during summer temps will liquify the grease just the same.
    This is likely what is really happening.

    The grease will break down with time and as its viscosity drops it will pass through seals easier than before resulting in leaks.

    The right correction would be to pull the boots back, clean and replace the grease. The question now is, how frequently do you do this?
    Afshin

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    Re: Leaking CV Boots

    Quote Originally Posted by NE Spyder View Post
    This is likely what is really happening.

    The grease will break down with time and as its viscosity drops it will pass through seals easier than before resulting in leaks.

    The right correction would be to pull the boots back, clean and replace the grease. The question now is, how frequently do you do this?
    In my case, it was very clear that the clamp had worked its way loose. It was very easy to twist the boot by hand. Once I replaced the clamp with a worm gear hose clamp, no leaks at all.

    Remember, the factory clamps are flimsy excuses for clamps that are designed for speed of assembly at the factory. Use good clamp and you will have no problems.

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    Re: Leaking CV Boots

    Quote Originally Posted by NE Spyder View Post
    This is likely what is really happening.

    The grease will break down with time and as its viscosity drops it will pass through seals easier than before resulting in leaks.

    The right correction would be to pull the boots back, clean and replace the grease. The question now is, how frequently do you do this?
    When the boots fail and before they let any dirt in.

    In the case of my 02 Boxster when the original CV boots cracked at something way over 200K miles. The tech removed both axles and disassembled cleaned and inspected the bearings and found no reason to replace. He repacked them with grease fitted new boots and the axles/boots/etc have been problem free since. The car now has just under 275K miles.

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    Re: Leaking CV Boots

    Quote Originally Posted by NE Spyder View Post
    This is likely what is really happening.

    The grease will break down with time and as its viscosity drops it will pass through seals easier than before resulting in leaks.

    The right correction would be to pull the boots back, clean and replace the grease. The question now is, how frequently do you do this?
    No it doesn't. That is the grease doesn't break down and leak. The boots fail or less often a clamp fails.

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