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Crankshaft oilway grub screws

Home Forums Main Forum Crankshaft oilway grub screws

This topic contains 4 replies, has 5 voices, and was last updated by Ian Bradshaw Ian Bradshaw 1 week, 5 days ago.

  • Author
  • #6411
    john martin
    john martin

    On one, I’ve used an impact screwdriver, on another a screwdriver bit in my socket set ratchet handle, but I’ve only succeeded in rounding the edges of the grub screw off.

    Now I’m stuck, do I have to drill the remains out & use a stud extractor?

    How do you successfully remove the oil way grub screws from a Trident crankshaft?

  • #6414

    Angus McLeod

    At this stage you are probably going to have to dill it out. Drill it until there is hardly anything left and try and pick the bits out or use a tap. The tricky bit is drilling it central. If the worst happens you could tap it a size bigger but that wants to be the last resort.

    Another way to remove it would be spark erosion if you know anywhere that can do it.

    It goes without saying make sure you have cleaned it properly afterwards.

  • #6417
    Kerrin Gautrey
    Kerrin Gautrey

    And replace them with Allen headed grub screws when you rebuild the engine.


  • #6424
    iain strong
    iain strong

    John did you heat the screw before trying to remove it?? if not try some heat and punch the  screw you may just get enough purchase  to break the Loctite

  • #6425
    Ian Bradshaw
    Ian Bradshaw

    John, Clean, Clean, Clean. I had to drill mine out. I did it very slowly and cleaned the swarf from the hole regularly with a strong magnet and airline. When I tapped the hole I put a small but strong magnet on the tap and only did a full turn of the tap at a time then cleared the swarf from the tap. Finally I sealed all the bearing holes except the one closest to the hole I had just tapped, squirted paraffin in and then blew it out with an airline. A long winded operation but shorter and less costly than having swarf running around the engine and the subsequent blow up.

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