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    Upgraded Oil Pump Shaft Stuck

    Hi guys,

    Hoping for some advice;

    Purchased the Achilles upgraded oil pump shaft,

    - got the old rotor/gear pressed on to the new shaft (placement looks okay with a tape, but I'm sure the shop used calipers),

    - placed the new shaft in the oil pump no dramas,

    - shaft and rotor/gear spins freely,

    But when I close up the cover the rotor is scoring on the back of the pump and is hard to spin, any ideas?

    Am I missing anything?

    Two directions I'm thinking are;
    - housing may be too tight (can't get my torque wrench behind 2 of 4 bolts)?
    - rotor/gear is pressed too far or not enough on the shaft?
    - other?

    (the photo with the inner gear not sitting flush with the outer gear is just to show the placement - the inner gear sits 'almost' flush when all the way in, maybe 1 or 2mm out)

    Cheers,




    screenshot tool

    #2
    I'm pretty sure that the inner gear needs to sit perfectly flush with the outer. Otherwise the cover will push against the inner gear before the cover is tight. The inner gear is pressed too far onto the shaft.

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      #3
      Thanks for the reply Jaker,

      I checked again, the inner gear is sitting flush with the outer gear,

      Comment


        #4
        If it's oiled, the pump shaft should turn freely when it's assembled. There should be minimal resistance.

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          #5
          Hi guys,

          I added a couple videos to show what I mean,

          Before oiling it was extremely tight, after oiling there is still some resistance - anyone have an unopened oil pump sitting on a bench to check the resistance?

          Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.


          Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.


          There is some resistance (where the turning is slow) - and then after (what I assume is the oil is pressurised) the sprocket turns freely,

          Any ideas?

          Cheers,

          Comment


            #6
            The shaft should spin with minimal resistance through a full rotation. There is a possibility that the shaft is slightly bent or out of round from manufacturer or installation of the gear. Can you run a dial indicator on the shaft with the cover installed to see if there is any run out?

            I haven't worked with these exact parts but I have seen similar pumps that came with different gaskets to attain proper clearance due to wear/manufacturing differences.
            Does this pump have a gasket? Are you using all new parts?

            You could apply bluing or use a marker, assemble the pump and spin a few times to possibly locate where the rubbing occurs. (Shaft/bushings and gear/ housing)

            The cover must be tightened evenly otherwise there is a chance of misalignment from torquing one side too much.
            sigpic
            1991 318is x 2 .

            Comment


              #7
              Originally posted by wartex11 View Post
              Hi guys,

              I added a couple videos to show what I mean,

              Before oiling it was extremely tight, after oiling there is still some resistance - anyone have an unopened oil pump sitting on a bench to check the resistance?

              There is some resistance (where the turning is slow) - and then after (what I assume is the oil is pressurised) the sprocket turns freely,

              Any ideas?

              Cheers,
              I don't have any more input than what I've already said, other than to comment that if I'm interpreting your videos correctly, there is far too much resistance in that pump assy.

              Comment


                #8
                Were you able to figure this out? Also, do you happen to know the torque value for the reverse threaded bolt on the Achilles upgrade?

                Comment


                  #9
                  Originally posted by jph View Post
                  Were you able to figure this out? Also, do you happen to know the torque value for the reverse threaded bolt on the Achilles upgrade?
                  Hey bud,

                  The reverse threaded oil pump bolt needs to be torqued to 22-24N/m (17-18ft/lbs),

                  Did you have a similar issue to me? Still haven't resolved, don't want to put it all back together and have low oil pressure,

                  Comment


                    #10
                    Originally posted by wartex11 View Post
                    Hey bud,

                    The reverse threaded oil pump bolt needs to be torqued to 22-24N/m (17-18ft/lbs),

                    Did you have a similar issue to me? Still haven't resolved, don't want to put it all back together and have low oil pressure,
                    No, fortunately mine spins freely. I received mine over a year ago and just now getting around to building my motor. FWIW, I chose to have Achilles press a new OEM inner rotor onto the shaft before they sent it to me. I also torqued the oil pump housing cover bolts down to 89 in/lbs in a criss-cross manor. Not sure if you wanted to give that a try if you haven't already.

                    What are anyone's thoughts on using a blue or red loctite on the bolt when installing? I know it comes drilled for safety wire but was thinking some blue or even red loctite might be some extra insurance. Am I being too paranoid?

                    Comment


                      #11
                      Originally posted by jph View Post
                      What are anyone's thoughts on using a blue or red loctite on the bolt when installing? I know it comes drilled for safety wire but was thinking some blue or even red loctite might be some extra insurance. Am I being too paranoid?
                      I have never put loctite on the pump housing bolts or in the shaft bolt. Zero problems, even when I built my first m52 six years ago. Also the factory service manual doesn't say to use loctite. I think the flywheel bolts are the only one where factory manual says to put loctite on m5x engines.

                      Comment


                        #12
                        I reached out to Achilles before asking about the torque and they came back with clean threads, blue loctite, apply torque.




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