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How do I get these bolts out please?

Discussion in 'Australia' started by Scottyx, Sep 29, 2020.

  1. Scottyx

    Scottyx Been here awhile

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    BF50E7A4-1D79-40C4-B5DE-9C76C49955B9.jpeg G’day
    I’m trying to pull this rotor apart to change the one way bearing.

    It’s off a 1988 Tenere.

    There are stake marks in the bolts which might be making them hard to undo.

    I’ve tried by ratchet but can’t hold the rotor tight enough and I put a rattle gun on it as well, but no luck.

    Do I drill down the center of the bolts first and buy new ones?
    #1
  2. Scottyx

    Scottyx Been here awhile

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    AE57935F-615D-41EB-8AC9-96B2D3BAF017.jpeg Hex head on other side

    Slightly damaged bolt top left of picture trying to undo it yesterday
    #2
  3. Uncle Crumpet

    Uncle Crumpet Long timer

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    left hand thread?
    #3
  4. Scottyx

    Scottyx Been here awhile

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    I better try find out.
    #4
  5. Scottyx

    Scottyx Been here awhile

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    Nothing on the parts diagram to say. I'll see if I can find a manual.
    #5
  6. Paul124ac

    Paul124ac Long timer

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    Yeah, looks like they’ve been centre punched or pressed after install, possibly Loctite as well? Grade 12.9 hex heads will be hard to drill, applying heat might fuck up the part you’re trying to fix, I’d be carefully trying to remove the boss on the thread end, maybe with a flapper wheel, try the rattle gun then maybe a cold chisel? There are some good release agents around, Loctite freeze and release or Boltoff both work. If you have to end up drilling then use trefolex or similar, go slow, possibly a cobalt drill but HSS should be ok, they look cad plated so initially will be hard. If you can set it up in a pedestal drill that would be preferred.

    Having said all that I’ve butchered some shit in the field with a battery drill and cleaned up the thread with a tap and it all still works.
    #6
  7. Paul124ac

    Paul124ac Long timer

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    I was looking for some sort of mark for a lefty tighty bolt, usually got some lines or summint.

    @Bluetonguejak ?
    #7
  8. Paul124ac

    Paul124ac Long timer

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    Oh yeah, should add, there are rattle guns and there are rattle guns. I bought a cheap arse 240v Ozito thing from Dumbings, I pull apart a lot of big hydraulic rams with many many unbrakos in them. The thing rocks, kicks my Hitachi rechargeable and air guns to the kerb.
    #8
    tripodtiger likes this.
  9. Big Willy

    Big Willy Gen. Italia

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    Gday Scotty. Sounds like you'll fuck the screw heads before they start to move.
    I'd take an angle grinder to the punched part.
    I'd then mig a bit of steel to the bolt heads.
    The combination of heat plus the leverage will undo those.
    There'd be no reason for them not to be normal threads imo
    Cheers
    #9
  10. saltyD

    saltyD Been here awhile

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    .. if you munt them, there appears to be three spares ready to go on re-assembly, at least.
    #10
  11. GodSilla

    GodSilla I did that.

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    Apply a huge whack with a large lump hammer to each of those bolts (via a drift), the impact may be enough to break any thread sealings.
    #11
  12. greyrider1

    greyrider1 old tinkerer Supporter

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    Drill the heads off the bolts, that way you can take the ring off and the tension on the bolts will be gone, get vice grips on the stumps that are left and heat the ring to "release" the loctite, that works on xrs, you might have to drill down the staked end too to remove some metal, good luck
    #12
    zedexniner, Donkey Hotey and mrsdnf like this.
  13. Boxa

    Boxa 2 Smoking Barrels

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    Drill out the heads and if the bolts are threaded all the way weld a nut on the other-staked end and unscrew them maybe?
    #13
    tomrux likes this.
  14. tripodtiger

    tripodtiger Off riding around on bitumen circles.

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    That's the sort of thing I say to myself, "hmmm, think I'd better take it to the engineering shop".
    Immediately followed by the thought 'before i fuck it'.

    Discretion is often better for my wallet.
    #14
    zedexniner, GSXR, Hay Ewe and 8 others like this.
  15. Bluetonguejak

    Bluetonguejak Pretend racer

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    Hey Paul:thumb, some lefties have a radial groove, but haven't seen many LH cap screws marked.



    Many good suggestions already.

    @Scottyx - Drill/grind the spiked end off the screw before trying to remove otherwise it may bind in the thread when being screwed-out..

    As already suggested, give the centre of the screw (in the hex) a couple of hard/sharp hits with a punch to 'shock' the thread.

    Try a decent rattle gun with inhex socket first if at hand, otherwise hand tools are fine.

    Make sure your hex wrench/socket is in good condition to give you the best 'bite'. Worn/rounded hexies are a recipe for disaster.

    Secure the part as best you can so you can apply max pressure and support on the wrench with both hands, keeping the hex fully engaged as squarely as possible.

    If the hex of the head is already a bit rounded, you can get another bite at it by hammering the high spots flat and hammering the key/socket into the hex to broach it back to size.

    Leverage can be your friend or enemy.....

    Localized heat on the screw can help if a strong loctite has been used.

    When all else fails, drill the heads off and deal with the threaded part of the screw without the tension on them.

    Just don't break any drills or extractors off in the screw otherwise it gets expensive to EDM the bits out.:deal

    This is a case of knowing you're shit or knowing your shit:hmmmmm

    BOL
    #15
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  16. Scottyx

    Scottyx Been here awhile

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    Thanks for all the replys.

    I've run short of time at the moment, but I reckon I might have a crack at it after the long weekend.

    Have a good one anyone going away. (probably the smart one staying at home too)

    Cheers
    Scott
    #16
  17. Red_dog

    Red_dog Dirt Road Sniffer outerer Supporter

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    My thoughts exactly
    #17
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  18. BergDonk

    BergDonk Old Enough to Know Better

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    I like to grind the 6 point sockets down a bit to remove the entry taper so they bite more. Might help.
    #18
  19. Fearless Whetu

    Fearless Whetu Aussi Kiwi

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    Exactly my first though hehe... But also I've found putting it down and walking away for a while often leads to a new train of thought and ideas that solve the problem
    #19
    tripodtiger, Red_dog and BergDonk like this.
  20. Hay Ewe

    Hay Ewe Just a Wannabe

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    How does the manual say to do it?
    Does the part need to be installed to crack the bolts?
    #20