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Thread: Oil leaking from pinion nut threads

  1. #1
    Member Ontariomystic's Avatar
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    Oil leaking from pinion nut threads

    Doing some maintenance on the Cobra today, noticed oil had been flinging off of the pinion flange when driving last summer. Housing around the pinion flange is bone dry. Removed the drive shaft to have a look and found diff fluid leaking from the pinion nut threads. Does this mean the pinion seal is bad?
    Doing my part to boost the economy

  2. #2
    Admin ZR's Avatar
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    Normally it's the silicone on the splines has deteriorated n allowing oil by.

  3. #3
    Member Ontariomystic's Avatar
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    Quote Originally Posted by ZR View Post
    Normally it's the silicone on the splines has deteriorated n allowing oil by.
    Never new there was sealant on the spline. If thats the case and specific sealant to use to reseal?
    Doing my part to boost the economy

  4. #4
    Admin ZR's Avatar
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    Wipe splines on the pinion best you can, remove old silicone and fluid from the pinion flange and nut. Slide the flange back on with a smear of silicone full length of it's splines (not on the pinion itself as you may push silicone into the bearing), before installing the nut, silicone on it's flat face plus just a little on the pinion gear threads. Spin the nut on slowly so you don't fling the sealant off. No reason not to mark nut before removing so you can spin it back to exactly where it was.
    My go to product, plain black silicone, not high heat version.
    On the rear covers, Three bond sealant.

  5. #5
    Admin ZR's Avatar
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    Quote Originally Posted by Ontariomystic View Post
    Never new there was sealant on the spline. If thats the case and specific sealant to use to reseal?
    Should be a smear under the nut as well but many we remove have none.

  6. #6
    Member Ontariomystic's Avatar
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    going to give it a try...thanks
    Doing my part to boost the economy

  7. #7
    Club Supporter Frankie's Avatar
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    Which Three Bond Sealant Rick?
    Gray or red?

  8. #8
    Admin ZR's Avatar
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    Grey

  9. #9
    Member Ontariomystic's Avatar
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    Any negatives to using permatex "The Right Stuff" for that same job?
    Doing my part to boost the economy

  10. #10
    Admin ZR's Avatar
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    ^ For rear cover? While we've tried several different silicones with poor results, have not tried The Right Stuff.

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