Replacing main bolt in 5.7 should I worry

New Hemi Engine Swaps

  1. 73Scamp6.1

    73Scamp6.1 Well-Known Member

    Messages:
    54
    Likes Received:
    0
    Joined:
    Dec 3, 2014
    Location:
    Slidell, LA
    Local Time:
    2:56 PM
    First off I'm using a truck pan and tube for the 5.7 and mating it to a Challenger 5.7. I am trying to replace the main bolt on the number 4 main with one from the truck 5.7 because it has a stud on it that supports the oil tube. (sorry no pics right now) My worry is that I will end up scoring the main bearings somehow while swapping this out. I don't plan on pulling both bolts for that main cap, but I can if that's the way it should be done. Can I just pull the one side, replace the bolt and retorque? I guess I'm worried about the bearing shifting or something when I pull it and then me not noticing it and retorquing it and then the bearings get screwed up. Thoughts?
     
  2. toolmanmike

    toolmanmike FABO Staff Staff Member FABO Gold Member

    Messages:
    46,854
    Likes Received:
    31105
    Joined:
    Jan 18, 2006
    Location:
    Iowa
    Local Time:
    2:56 PM
    I would pull both and retorque properly. They might be torque to yield (or torque and then angle) and also can't be reused. Check a factory service manual to be sure. Better to be safe than sorry.
     
  3. 73Scamp6.1

    73Scamp6.1 Well-Known Member

    Messages:
    54
    Likes Received:
    0
    Joined:
    Dec 3, 2014
    Location:
    Slidell, LA
    Local Time:
    2:56 PM
    That's sort of the direction I was leaning. I'll dig around for the service manual. Thanks.
     
  4. HardVG

    HardVG Well-Known Member

    Messages:
    173
    Likes Received:
    11
    Joined:
    Sep 1, 2013
    Location:
    Australia
    Local Time:
    3:56 AM
    They are torque to yeild bolts so replace one of both, do not re-use the old bolts. I just cut the oil pickup thread off my existing one so that I could leave it in place and I only need to install one new bolt in the new location and don't need to upset the other one.
     
  5. Hellcat Cuda

    Hellcat Cuda Well-Known Member

    Messages:
    553
    Likes Received:
    47
    Joined:
    Jan 12, 2013
    Location:
    Northern Calif.
    Local Time:
    12:56 PM
    You definitely can not use the main bolts over again. Remove both bolts; replace with new ones and torque them both down properly and evenly so the main cap is not distorted in any way. We're not talking a lot of money here.
     
  6. SGBARRACUDA

    SGBARRACUDA ROY FABO Gold Member

    Messages:
    15,855
    Likes Received:
    4929
    Joined:
    Dec 7, 2006
    Location:
    PLANT CITY FL. and PERRY GA.
    Local Time:
    3:56 PM
    All of the above is good,safe advice. Me I would remove the one bolt and retorque it. Done it many times. This is my 2 cents. You should do what makes you feel good.
     
  7. 73Scamp6.1

    73Scamp6.1 Well-Known Member

    Messages:
    54
    Likes Received:
    0
    Joined:
    Dec 3, 2014
    Location:
    Slidell, LA
    Local Time:
    2:56 PM
    Thanks for all the input. Looks like I need to order the other bolt then, definitely not a lot of money. I think the bolt with the stud is about $7 through the dealer. No biggie.
     
  8. Hellcat Cuda

    Hellcat Cuda Well-Known Member

    Messages:
    553
    Likes Received:
    47
    Joined:
    Jan 12, 2013
    Location:
    Northern Calif.
    Local Time:
    12:56 PM
    People are use to the old school bolts that can be re-torqued a few times. These new age bolts are "torque to yield" and are not to be re-used. Put two new ones in. Plus, the whole purpose of a torque sequence it to bring the caps down evenly. Replacing just one without loosening (and replacing) the other side means it'd be torqued to final number and then you'd be bringing the other bolt down by itself. Wrong way...
     
  9. cu440da

    cu440da Well-Known Member

    Messages:
    267
    Likes Received:
    15
    Joined:
    Jun 12, 2011
    Location:
    Cottage Grove, MN
    Local Time:
    2:56 PM
    Not trying to stir the pot here, but wont the other two cross bolts keep that cap from going anywhere?
     
  10. 73Scamp6.1

    73Scamp6.1 Well-Known Member

    Messages:
    54
    Likes Received:
    0
    Joined:
    Dec 3, 2014
    Location:
    Slidell, LA
    Local Time:
    2:56 PM
    In case anyone was wondering. I loosened both bolts and the cap didn't move at all, that being said I didn't try to move it either. I removed one of the bolts and replaced, hand tight. Removed the other and replaced, hand tight. Then torqued each to the recommended 20 lbs, then added the recommended 90 degree turn. The cap never appeared to move throughout the whole procedure.
     
  1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.