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Rear End Pinion Seal

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by **DONOTDELETE**, Sep 6, 2001.

    Here's the situation. I have a '86 k5 that is stock height, w/ heavy duty shocks & 31"x10.5" mudders, and a 10 bolt rear end. About two/three weeks ago I replaced the rear pinion seal. A day or two ago, I looked under the truck, and the damn seal is leaking again. I have had the truck off roading twice since I replaced the seal. I don't think the shocks or tires would affect heighth enough to affect this, but the only thing I can think has happened is that my axle has rolled slightly in the u bolts. It looks like the angle between the driveshaft and the rearend is off. The off roading I have been doing has required some "throttle manipulation" to conquer some of the more aggressive obsticles.

    God has a hard on for Marines, because we keep Heaven chock full of fresh souls!
     
  1. Burt4x4

    Burt4x4 3/4 ton status

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    I have found a couple of things that can cause a pinion seal leak. First if the yoke it self has a seal grove worn in it the yoke needs to be replaced. Next the seal it self, last the splines on the yoke should be coated with a light coating of RTV too keep the gear oil from working it's way thru the groves.
    Good luck

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  2. ftn96

    ftn96 1/2 ton status

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    Also need to make sure you put some grease on the seal itself before you put the yoke back on.

    tRustyk5 for President!!![​IMG]
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  3. Burt4x4

    Burt4x4 3/4 ton status

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    ahh yes this is true!! A good seal should come with black grease on it already. National Seal is top quality and comes with the seal pre-lubed!

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  4. ftn96

    ftn96 1/2 ton status

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    And a damn good seal should come with a 12 pack of beer.[​IMG]

    tRustyk5 for President!!![​IMG]
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  5. Burt4x4

    Burt4x4 3/4 ton status

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    Hell yes brother!!

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  6. Emmettology 101

    Emmettology 101 3/4 ton status

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    Another thing to check is see if you pinion nut is loose. it may be a little and wearing out the seal prematurly.

    Mike

    <font color=green>"My K5 is purdyr than your sister!"</font color=green>

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  7. Executioner

    Executioner 1/2 ton status

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    Not if he measuresed the pinion bearing pre-load, and used a good casterated nut.
     
  8. OK guys, thanks for all the info, now lets see if I got this straight. I applied both grease (white lithium) and RTV to the seal when I installed it last time. I ran the pinion nut down and set the preload just like the manual (Chilton's) explained. The seal held alright until after the second time I took the truck off road. It was shortly after that, that I noticed the seal once again leaking. I will check to see if the groove on yoke is worn, and replace if necessary. Does anyone think that the driveshaft angle is off?

    God has a hard on for Marines, because we keep Heaven chock full of fresh souls!
     
  9. Executioner

    Executioner 1/2 ton status

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    Chilton's explained pre-load for the pinion nut ?
    If you can could you please post that, I would really like to see it.

    Check you breather tube,make sure hot exspanding air in the diff can get out .
     
  10. Burt4x4

    Burt4x4 3/4 ton status

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    Hmm the driveline angle should not affect the pinion yoke and seal sence they are stationary. the Ujoint is were the angle would cause an issue. RTV on the seal? What I was refering to is on the inside of the Yoke were the splines are, to put a light coating there. Iv'e never put RTV on the seal it self. anyone?
    What rear end is this?

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  11. I'll find the spot and quote the manual verbatim. As for the RTV, I applied it to outside edge of the seal. The seal I replaced was installed the same way. I am willing to try putting RTV directly to end of the yoke. By the way, it's a 10 bolt.

    God has a hard on for Marines, because we keep Heaven chock full of fresh souls!<P ID="edit"><FONT class="small">Edited by John Ward on 09/06/01 03:36 PM.</FONT></P>
     
  12. Burt4x4

    Burt4x4 3/4 ton status

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    I've never worked on a 10 bolt so not sure about the RTV on the seal trick..
    On my Dana44 &amp; Dana60 the Yoke has no grove at all were the seal touches. So if your yoke does have a grove were the seal touches it may be the cause.?

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  13. dyeager535

    dyeager535 1 ton status Premium Member

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    BTW, Napa can get you repair sleeves for the yoke, should you find getting a new one a problem. Kind of pricey ($30 something I believe) when new yoke is somewhere between $60 and $100. Shops typically say they need to see the old yoke to replace it exactly.

    Dorian
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  14. Burt4x4

    Burt4x4 3/4 ton status

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    FYI... I just bought a yoke for my D60 rear from WCD and it was 35bucks DanaSpicer brand.

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  15. dyeager535

    dyeager535 1 ton status Premium Member

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    Who's WCD? Local driveshaft guys got me for $60 the last 10 bolt yoke I bought. Always nice to know where you can get a good deal.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  16. ftn96

    ftn96 1/2 ton status

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    WCD is West coast differentials
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