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Rear Main Seal

Discussion in '1st Gen Tundras (2000-2006)' started by 2006Tundra, Sep 13, 2021.

  1. Sep 13, 2021 at 7:50 PM
    #1
    2006Tundra

    2006Tundra [OP] Financially Irresponsible

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    Hey Guys,

    My mechanic replaced my rear main seal on 3/20/2020 and today, I think it blew again. I'm trying to figure out what may have caused this to blow prematurely. Any suggestions and ideas to make sure this wont happen again.

    My mechanic says he uses only Toyota parts. The more I read about this it maybe be a faulty crankshaft? I won't know until he tears the truck down tomorrow.

    Thanks
     
    jowillstin likes this.
  2. Sep 13, 2021 at 10:15 PM
    #2
    jerryallday

    jerryallday New Member

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    Any photos of the leak? Or did you just have a puddle of oil on the floor?
     
  3. Sep 13, 2021 at 10:46 PM
    #3
    Chip_Tundra

    Chip_Tundra New Member

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    Check all things that can create excessive pressure. I also had new rear main installed and it started leaking. Little did I know, my catalytic converter was done, and all the elements inside were restricting airflow.
     
  4. Sep 14, 2021 at 5:11 AM
    #4
    bmf4069

    bmf4069 Yup, that's car parts in a dishwasher

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    Could a clogged PCV valve cause this? Let's too much pressure build in the crankcase?
     
  5. Sep 14, 2021 at 5:59 AM
    #5
    2006Tundra

    2006Tundra [OP] Financially Irresponsible

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    @jerryallday No pics, just a few drops in the drive way/
    @Chip_Tundra and @bmf4069 I'll call my mechanic. He's going to look it over today and I'm going to stop by to check it out after work .
     
  6. Sep 14, 2021 at 6:30 AM
    #6
    Festerw

    Festerw New Member

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    Is he 100% sure it's the rear main leaking and not the valve covers? It wouldn't be the first time someone has found valve cover bolts finger tight, they seem to loosen over time.
     
  7. Sep 14, 2021 at 6:33 AM
    #7
    2006Tundra

    2006Tundra [OP] Financially Irresponsible

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    Yea, he lifted the truck in the air and we saw oil coming where the rear main is. I also tighten the valve covers a few months ago because I saw oil being built up around the top. I should know more today.
     
  8. Sep 15, 2021 at 6:03 AM
    #8
    2006Tundra

    2006Tundra [OP] Financially Irresponsible

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    Got my truck back yesterday. A new rear main seal was installed and new PCV valve. My mechanic says he doesn't know why it failed. The rear main looked fine and it was a Toyota part. I'm thinking it may have been a poor install OR the PCV valve wasn't working properly. He said the original PCV valve didn't look clogged but it was original so we replaced it. IDK, I'm going to drive it and monitor. Hopefully it holds.
     
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  9. Sep 15, 2021 at 6:25 AM
    #9
    FirstGenVol

    FirstGenVol Brake Czar

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    Did he charge you again? That's typically a really expensive repair.
     
  10. Sep 15, 2021 at 6:27 AM
    #10
    2006Tundra

    2006Tundra [OP] Financially Irresponsible

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    He did. I was hoping he would at least cut me a deal but since it was out of warranty, I couldn't really argue with him. Cost me $400.
     
  11. Sep 15, 2021 at 10:18 AM
    #11
    bmf4069

    bmf4069 Yup, that's car parts in a dishwasher

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    $400 ain't bad to drop a trans, pull a flex plate, then replace a seal.
     
  12. Sep 15, 2021 at 10:40 AM
    #12
    FirstGenVol

    FirstGenVol Brake Czar

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    I was thinking the same thing. When the rear main was leaking on the Rav4 the Stealer quoted me almost $2,000 to replace it. :rolleyes:
     
    bmf4069[QUOTED] likes this.
  13. Sep 15, 2021 at 10:43 AM
    #13
    bmf4069

    bmf4069 Yup, that's car parts in a dishwasher

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    daaaaaaamn.jpg
     
  14. Sep 15, 2021 at 10:59 AM
    #14
    2006Tundra

    2006Tundra [OP] Financially Irresponsible

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    I'm not sure why prices differ from vehicle to vehicle but I assume it must be an easier job to do on our trucks. I just hope I don't see oil again.


    What are your thoughts about switching back to conventional oil? A buddy mention, since my truck does call out for 5w-30 conventional, that I should go back because it's thicker, and full syn is thinner and will find a way to leak out.
     
  15. Sep 15, 2021 at 4:16 PM
    #15
    KNABORES

    KNABORES Sarcasm incoming

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    Not buying that. Oil weight is oil weight. Not related to type of oil.
     
  16. Sep 15, 2021 at 6:03 PM
    #16
    10 blue trucks

    10 blue trucks New Member

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    Agreed, if 5-30 conventional was thicker than 5-30 syn it would be labeled 10-40.
     
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  17. Sep 16, 2021 at 3:07 AM
    #17
    Sirfive

    Sirfive Master Procrastinator

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  18. Sep 16, 2021 at 6:46 AM
    #18
    chunk

    chunk New Member

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    Fully synthetic oil in my Tundra, no leak, and it will be old enough to drink beer next year.
     
    bmf4069 and 2006Tundra[OP] like this.
  19. Oct 8, 2021 at 9:01 AM
    #19
    2006Tundra

    2006Tundra [OP] Financially Irresponsible

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    Update
    I had the rear main seal replaced a few weeks ago. After the replacement, I cleaned the area with simple green, drove it to work for a week and noticed oil is still coming from the rear main seal area. It's not a lot, doesn't drip on to my driveway but it's still a leak.
    It's back in the shop and my mechanic isn't sure why it's still leaking. He says there some bolts on fly wheel that connect to the crank shaft that may be where it's leaking from. He's going to put some sealer in that area.
    He says he's seen it leak from there before and he's put sealer on and it fixes the issue.
    He says it's not the rear main seal. Nothing is coming from the valve covers. He's pretty confident it'll work.

    Thoughts?
     
    Last edited: Oct 8, 2021
  20. Oct 8, 2021 at 11:43 AM
    #20
    assassin10000

    assassin10000 New Member

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    Some Toyota crankshafts are drilled all the way through and you need to use a thread sealant (blue loctite) on the crank bolts or oil will leak past them.
     
  21. Oct 8, 2021 at 12:21 PM
    #21
    2006Tundra

    2006Tundra [OP] Financially Irresponsible

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    Fingers crossed it fixes the issue. Thanks for the reply.
     
  22. Oct 20, 2021 at 6:59 AM
    #22
    2006Tundra

    2006Tundra [OP] Financially Irresponsible

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    Still leaks. Not sure where it's coming from. Hoping it's not a bigger issue.
     
  23. Feb 11, 2023 at 10:31 AM
    #23
    jowillstin

    jowillstin New Member

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    Hey, if you don’t mind me asking, where’d you go for the rear main seal
    Repair?
    It was only $400 ?
     
  24. Feb 11, 2023 at 11:41 AM
    #24
    2006Tundra

    2006Tundra [OP] Financially Irresponsible

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    Woah, I totally forgot to update. The shop is Montero’s Auto Services in Bellflower, CA. He does a good job but isn’t the cleanest mechanic.

    The leaked did stop but only after I took the inspection plate off and degreased the area. There was left over oil and that was what I thought was the leak.
     
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  25. Aug 4, 2023 at 7:55 PM
    #25
    ajdeez

    ajdeez New Member

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    Is your truck 4wd?
     
  26. Aug 5, 2023 at 8:38 AM
    #26
    2006Tundra

    2006Tundra [OP] Financially Irresponsible

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    No, it's not.
     

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