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  • rebiuld questions

    i am rebuilding my 3800 motor in my camaro that has 120k miles, should i replace the crank shaft? I didn't spin a bearing or anything and the crank isn't damaged.

  • #2
    Re: rebiuld questions

    You should at the minimum have a machine shop check it out.
    sigpic

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    • #3
      Re: rebiuld questions

      Originally posted by Camaroman1221 View Post
      i am rebuilding my 3800 motor in my camaro that has 120k miles, should i replace the crank shaft? I didn't spin a bearing or anything and the crank isn't damaged.
      no need, just have a machine shop clean it up and check it out for you
      http://www.bowtiev6.com/

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      • #4
        Re: rebiuld questions

        I had mine rebuilt at 122,000 miles and the mechanic checked out everything and then used clev.77 bearings all around and it has been running great ever since with 168,000 miles on it and 7 years later.
        08' L76 6.0L 4X4 Chevy EXT.Cab LTZ Vortec MAX with Snug top cover, Dynomax exhaust,Hptuners& K&N intake
        96' Camaro M5 to A4 conversion, alot of mods . GT35R Turbo full suspension. Built engine

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        • #5
          Re: rebiuld questions

          ok i screwed up the #1 bridge for the crank shaft trying to get it out, anyone know the part number or if i can even get one off of GM Parts Direct?

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          • #6
            Re: rebiuld questions

            Originally posted by Camaroman1221 View Post
            ok i screwed up the #1 bridge for the crank shaft trying to get it out, anyone know the part number or if i can even get one off of GM Parts Direct?

            Do you mean the main cap?
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            • #7
              Re: rebiuld questions

              Yup that would be then, forgot the name of them for a minute

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              • #8
                Re: rebiuld questions

                If you need to replace a main cap on a block, you need to have the block line bored after the replacement. It may be cheaper finding another block.
                sigpic

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                • #9
                  Re: rebiuld questions

                  oh great, ok i am gonna have to look at the cap and see what i did to it cause i only think there is a nic on the top part of it from me wiggling it, the part were the cap touches the black and were the bearing sits are untouched

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                  • #10
                    Re: rebiuld questions

                    Originally posted by Camaroman1221 View Post
                    oh great, ok i am gonna have to look at the cap and see what i did to it cause i only think there is a nic on the top part of it from me wiggling it, the part were the cap touches the black and were the bearing sits are untouched

                    If the cap doesn't fit against the block tight the clearence will be off on the bearing to crank. If you burred it, you may be able to just remove the burr.
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                    • #11
                      Re: rebiuld questions

                      ok thats good to know because the parts that is messed up alil bit is not the sides or bottom where it contacts the block, is the part on that top so i should be ok

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                      • #12
                        Re: rebiuld questions

                        Originally posted by Camaroman1221 View Post
                        ok thats good to know because the parts that is messed up alil bit is not the sides or bottom where it contacts the block, is the part on that top so i should be ok

                        As long as it is not bad enough to effect the strength of the cap it should be fine.
                        sigpic

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                        • #13
                          Re: rebiuld questions

                          Originally posted by Camaroman1221 View Post
                          ok thats good to know because the parts that is messed up alil bit is not the sides or bottom where it contacts the block, is the part on that top so i should be ok
                          can you take a picture?

                          im betting that it is fine and you can re-use it

                          a nick on the top of the main cap doesnt seem like a threatening problem on a 200hp engine

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                          • #14
                            Re: rebiuld questions

                            i'll get some pics of the cap when i get off work and post them up

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                            • #15
                              Re: rebiuld questions

                              Originally posted by Camaroman1221 View Post
                              i am rebuilding my 3800 motor in my camaro that has 120k miles, should i replace the crank shaft? I didn't spin a bearing or anything and the crank isn't damaged.
                              Crankshaft replacement is usually not required in a rebuild.

                              First thing to do with the crank is have it magnafluxed and checked for straightness. If it passes those two tests, then it's journals need to be inspected for wear and machined undersize if necessary. If there is no significant wear, simply have the journals micropolished.

                              As for bearings, I think that, right now, the best stuff comes from Mahle Clevite. If the crank didn't need undersizing, use either standard or -.001 bearings to get the desired main bearing clearance.

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