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Detroit 12.7 oil pan bolts

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by jeffman164, Jan 23, 2019.

  1. Jan 23, 2019 #1
    jeffman164

    jeffman164 Medium Load Member

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    Going to change oil pan gasket because of oil leakage. When I research it , some say that you should change all bolts ,isolators and washers . People also say , most times that it is a cracked pan and not the gasket . I will check it out with a magnifying glass for cracks before replacing . Regarding new bolts , isolators and washers - Necessary ? Seems like a bolt is a bolt as long as not stripped or hex is buggered .
     
    jeffman164, Jan 23, 2019
    jeffman164, Jan 23, 2019
    #1
    Rideandrepair Thanks this.
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  3. Jan 23, 2019 #2
    Rideandrepair

    Rideandrepair Road Train Member

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    Just isolators and really only if they’re bad. Otherwise be sure to use silicone at corners where block castings meet
     
    Rideandrepair, Jan 23, 2019
    Rideandrepair, Jan 23, 2019
    #2
  4. Jan 23, 2019 #3
    jeffman164

    jeffman164 Medium Load Member

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    Just heard but seemed a little hard to believe - if you use new bolts and isolators , it would be harder to over tighten bolts and inadvertently crack plastic pan .
     
    jeffman164, Jan 23, 2019
    jeffman164, Jan 23, 2019
    #3
    Rideandrepair Thanks this.
  5. Jan 23, 2019 #4
    Rideandrepair

    Rideandrepair Road Train Member

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    Isolators prevent cracking. If bad and tightened, I guess it’s possible. I doubt pan is cracked they’re pretty tough. I sealed mine all the way across back to eliminate possible leak. It was unnecessary though. Mines leaking bad at rear cover. That job includes removing pan, motor mounts and trans.
     
    Rideandrepair, Jan 23, 2019
    Rideandrepair, Jan 23, 2019
    #4
  7. Jan 27, 2019 #5
    Masonkid

    Masonkid Bobtail Member

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    Replaced mine a few weeks ago. New isolators, all of them, plenty of silicone...I would think only with an impact and bad judgement would you over tighten.
     
    Masonkid, Jan 27, 2019
    Masonkid, Jan 27, 2019
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    RubyEagle Thanks this.
  8. Jan 28, 2019 #6
    jeffman164

    jeffman164 Medium Load Member

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    Maybe it is the isolators that should be new . I will definitely purchase them before I drop the pan . Thank you to all .
     
    jeffman164, Jan 28, 2019
    jeffman164, Jan 28, 2019
    #6
  9. Jan 28, 2019 #7
    Rideandrepair

    Rideandrepair Road Train Member

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    That’s right
     
    Rideandrepair, Jan 28, 2019
    Rideandrepair, Jan 28, 2019
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    RubyEagle Thanks this.
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