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Rear Main Seal failure due to dirt getting in the inspection hole?

Discussion in '5th Gen 4Runners (2010+)' started by mve, Jan 8, 2021.

  1. Jan 8, 2021 at 11:26 PM
    #1
    mve

    mve [OP] New Member

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    Just saw this review where Jim described a Rear Main Seal failure due to dirt getting in the inspection hole. I searched but couldn't find any posts about this specific issue. Has anyone else experienced this? Perhaps this guy pushes his rig to the max? Here's a sample of his off-roading: https://www.youtube.com/watch?v=rOJFDHOMCjw
     
    A&P likes this.
  2. Jan 9, 2021 at 10:50 AM
    #2
    ThePnsh3r

    ThePnsh3r New Member

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    Have not come across such posts or seen anyone else report issues with the rear main leaking. Although, every time I watch this guy’s videos I get severely stressed out. His 4Runner really is a testament as to how much abuse they can endure. That poor thing gets beat on relentlessly.
    And that he has not flipped over yet is a miracle in itself. He sure as heck came extremely close several times.... again, pure miracle lol
     
    mve [OP] likes this.
  3. Jan 9, 2021 at 10:57 AM
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    A&P

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    Yeah I won't be doing that kind of off roading W/mine. That's what my ATV is for. I can trailer it home IF I break it. I trailer it anyways but you get my point.
     
  4. Jan 9, 2021 at 11:43 AM
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    trlhiker

    trlhiker New Member

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    Not sure if you would call him an great off road driver or foolish for taking so many chances. Thought he was going to flip a few times.
     
  5. Jan 9, 2021 at 7:27 PM
    #5
    e_alvarez91

    e_alvarez91 New Member

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    He is on his 3rd rear main I believe including the original, he puts a piece of duct tape over the inspection hole before he wheels now. I do the same!
     
    mve [OP] likes this.
  6. Jan 9, 2021 at 8:46 PM
    #6
    SWxSW

    SWxSW New Member

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    im going ro do the tape thing also. can i just leave it on there?
     
  7. Jan 9, 2021 at 11:17 PM
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    mve

    mve [OP] New Member

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    What are the mechanics behind this failure? Is it dirt entering the back of the engine during water crossing? Can it happen with a simple off-road driving on dusty roads?

    Seems like a serious day-ender type problem with a huge price-tag to boot, so definitely good to take some preventative measures.

    And while I agree that Jim's driving style is probably more aggressive than most (certainly mine), I still think it's worth to learn from his experience. I also have great respect for folks that push the boundaries of what's possible and then share their experience.
     
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  8. Jan 10, 2021 at 2:43 AM
    #8
    ThePnsh3r

    ThePnsh3r New Member

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    It has to be the water crossings. Anyone with two working noodles in the bugging knows that they’re horrible for any submerged bearing or seal. Best way to cause premature wheel bearing hub failure, and really everything else that gets under water.
    It looks epic on the video - but is horrible for the vehicle
     
    bear1998 likes this.
  9. Jan 10, 2021 at 5:27 AM
    #9
    bear1998

    bear1998 New Member

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    I pitty the people who buy these vehicles after they are done with them...whats really sad...theyll probly get top dollar...
     
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  10. Jan 10, 2021 at 5:43 AM
    #10
    ThePnsh3r

    ThePnsh3r New Member

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    Indeed. That thing is beat on relentlessly.
    There are many 4runners that have well over 100k and many off-road miles with zero issues. But deep water fording is horrible for any lubricated parts that get submerged. Especially mud or saltwater.
     
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  11. Jan 10, 2021 at 7:47 AM
    #11
    A&P

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    And that is just ONE of the reasons I NEVER buy USED ANYTHING!!
     
    mve [OP] likes this.
  12. Jan 10, 2021 at 7:49 AM
    #12
    A&P

    A&P Name: Kevin

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    Seals keep H2o out just like they keep oil/Grease in, BUT mud/Dirt can be detrimental to them more so.
     
  13. Jan 10, 2021 at 8:14 AM
    #13
    MI-FL off roader

    MI-FL off roader T4R Hobby/Addict

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    Blasting through the Florida Clay, Lime and Mud puddles is what most likely eroded his seal. There is so much crap suspended in the water of those areas. Very acidic properties in all of that stuff. My armor has permanent discoloring in the powder coating because of it. Crossing water is sometimes a necessity with having a bow wave an advantage, but going as fast as he did in several of those clips is what I think killed the seal.
    I always go home and put a good pressure sprinkler under my truck for several minutes, moving it around to knock everything off, and then finish up with a decent blast from my pressure washer at medium settings.
    Everything else he does in this vid is most likely not going to hurt too many critical parts with regular maintenance. But, yea I would never buy that truck lol. Some poor buyer will most likely get it off a lot after he trades it in.
    On the up side, I doubt he has any rodent damage, with a good coating of crap all over his wiring.
     
    mve [OP], ThePnsh3r and A&P like this.
  14. Jan 10, 2021 at 9:13 PM
    #14
    ElectroBoy

    ElectroBoy Ad astra

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    So where is this inspection hole? Anybody got a photo of this?
     
    peter2772000 likes this.

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