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Thread: CV Grease flinging out

  1. #1
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    CV Grease flinging out

    I am having an issue with my CV joints flinging grease from the boot.

    Basically it flung a small amount of grease from passenger inner joint and drivers inner since day one but recently it has gotten a little worse and i can see grease on the firewall, trans, wheel etc from every axle (passenger inner and outer and driver inner and outer).

    It seems like it was worst this last weekend when did a road course track day (4 20 minutes sessions in the Arizona heat). I will try to post pictures later.

    I assume it's a boot sealing issue but I'm not ruling out other factors like a grease overheating issue or a geometry on the coilovers? I wanted to chime in here to see if anybody else had any ideas or experience with this. Can/should the boots be tightened up beyond how I received them?

    Vehicle information is below

    Vehicle: 86 Plymouth Horizon
    Transmission: Large Spline 568
    Axles: O'reilly Reman 1990 Automatic Axles (both replaced at same time when i installed the transmission)

    Thanks!

  2. #2

    Re: CV Grease flinging out

    Mine did this on the driver's side. Not sure if another calmo will do, but worth a shot. If the boot has a seat ring on the end, a tight clamp should keep it from happening. Otherwise you have a small tear you can't see.
    Probably need to check mine.
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  3. #3
    Super Moderator Turbo Mopar Staff 135sohc's Avatar
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    Re: CV Grease flinging out

    Can you grab the boot and move it on the axle shaft or the joint housing at all ? Maybe 2 pairs of axles ago I got a set where both outers had the boot just loose enough to slide on the axle shaft. That time around the axles had the pincher type clamps so I took a pair of bridge clamp pliers and crimped them just a touch more.
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  4. #4
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    Re: CV Grease flinging out

    I read some information from a person who used to endurance race Neons and they constantly had this type of issue, especially at higher speeds.

    It ended up being the type of grease being used and how much was being used. The stuff that was in there wasn't up to the higher temps and they were putting too much in...so when it expanded it squirted out everywhere. For those of us that do autocross, road courses, etc. this might be something to add to the "prep list"...re-packing the CV joints with the correct grease.

  5. #5
    Super Moderator Turbo Mopar Staff contraption22's Avatar
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    Re: CV Grease flinging out

    It's been a constant problem with my car since exceeding 120mph.
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  6. #6
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    Re: CV Grease flinging out

    Quote Originally Posted by Reaper1 View Post
    I read some information from a person who used to endurance race Neons and they constantly had this type of issue, especially at higher speeds.

    It ended up being the type of grease being used and how much was being used. The stuff that was in there wasn't up to the higher temps and they were putting too much in...so when it expanded it squirted out everywhere. For those of us that do autocross, road courses, etc. this might be something to add to the "prep list"...re-packing the CV joints with the correct grease.
    I was kinda leaning towards this, I will look into changing out the grease. Thanks for the reply

    Quote Originally Posted by contraption22 View Post
    It's been a constant problem with my car since exceeding 120mph.
    Doh! I'm nowhere near 120 but the constant WOT acceleration and hard braking generates some heat I'm sure

  7. #7
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    Re: CV Grease flinging out

    humm I wonder
    if while you had the c-v joints apart and the grease cleaned off everything maybe a little rubber cement on the shafts , the grouve in the joint housing and the mateing parts of the boots would solve the leakage past the clamps?

    rubber cement tends to stick pretty good if the surfaces are clean and you let it set on both parts like you're supposed to

  8. #8
    turbo addict Turbo Mopar Contributor
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    Re: CV Grease flinging out

    Quote Originally Posted by Reaper1 View Post
    I read some information from a person who used to endurance race Neons and they constantly had this type of issue, especially at higher speeds.

    It ended up being the type of grease being used and how much was being used. The stuff that was in there wasn't up to the higher temps and they were putting too much in...so when it expanded it squirted out everywhere. For those of us that do autocross, road courses, etc. this might be something to add to the "prep list"...re-packing the CV joints with the correct grease.
    Quote Originally Posted by contraption22 View Post
    It's been a constant problem with my car since exceeding 120mph.
    I don't see what serious work they are having to do going straight line that creates heat, unless you have some wacky angles.

    I have always suffered from physical damage or failures of the boot. Been through at least 10 the last 10 years. Never actually replaced a boot.
    Would be interested on preferred low expansion grease.
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  9. #9
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    Re: CV Grease flinging out

    I didn't mention it because I thought it was kind of a common knowledge thing, but I've also seen zip ties used on the boots on the "low" parts of the bellows to keep them from ballooning out at higher speeds. Dunno if that's an actual issue for us, but thought I'd mention it.

  10. #10
    boostaholic Turbo Mopar Contributor
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    Re: CV Grease flinging out

    Quote Originally Posted by Reaper1 View Post
    I didn't mention it because I thought it was kind of a common knowledge thing, but I've also seen zip ties used on the boots on the "low" parts of the bellows to keep them from ballooning out at higher speeds. Dunno if that's an actual issue for us, but thought I'd mention it.

    Even Chrysler did that for speed runs. When they were doing speed tests on the PPG pace cars, especially the Daytona prototype. I have a book at home with pictures in it showing the zip ties on the boots to keep them from "blowing up".

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