Liquid metal,,(whatever its called)

Discussion in 'Workshop Projects' started by Lincs Lass, Mar 11, 2019.

  1. Lincs Lass

    Lincs Lass Member

    Location:
    north lincs
    I been given an old chainsaw and a couple of the threaded screw holes that hold the plastic covers on have had the threads striped out ,,cant rethread them as the casting hasnt got enough metal to do so .
    Would epoxy liquid metal set hard enough to redrill and rethread ,,its a magnesium case
     
  2. Ley253

    Ley253 Member

    Location:
    Bath
    Thread inserts?
     
  3. Lincs Lass

    Lincs Lass Member

    Location:
    north lincs
    Do they come in 4mm
     
  4. Ley253

    Ley253 Member

    Location:
    Bath
    That I dont know, but an engineering shop should. Also the holes perhaps could be tig welded and rethreaded. As they only hold plastic, a quality epoxy metal should be fine, just make sure its all clean before adding the stuff.
     
    Shavings man likes this.
  5. Ukjay

    Ukjay Member

    Location:
    In the Mud
  6. Lincs Lass

    Lincs Lass Member

    Location:
    north lincs
    Think I might take it to my husky dealer and get their opinion ,,not enough metal to drill out to get a helicoil in ,,its why I thought of the liquid fill stuff
     
    tomlad likes this.
  7. Ukjay

    Ukjay Member

    Location:
    In the Mud
    Yes, you will need enough to allow a 4.2mm drill, then have enough structural integrity to tap out the hole ready for the insert.

    If the guards are not safety related - you could mix this putty, then ram it in the hole, drill it and tap the hole to suit your 4mm thread:

    https://www.halfords.com/motoring/p...ast-metal-epoxy-putty?request_type=bestseller
     
  8. Lincs Lass

    Lincs Lass Member

    Location:
    north lincs
    That looks like the stuff ,,its only to hold the top plastic cover over the head and carburetor
     
  9. Ukjay

    Ukjay Member

    Location:
    In the Mud
    That should be ok then imho, you just need a Plug Tap as well as the tapered to get the thread all the way down to the bottom of the hole.
     
  10. Lincs Lass

    Lincs Lass Member

    Location:
    north lincs
    Looks like a good excuse to invest in a tap and die set ,,O dear ,how sad ,never mind
     
    Yazzie and Ukjay like this.
  11. Ukjay

    Ukjay Member

    Location:
    In the Mud
    Can never have too many tools (y)
     
  12. Dry Rot

    Dry Rot Member

    Location:
    Scotland
    Is there enough room to put a nut on the inside? Then glue one in position, it will be stronger than using glue to recreate the thread.
     
    Mursal likes this.
  13. Kidds

    Kidds Member

    Location:
    Warrington
    Just liquid metal the screws in and then unscrew when it has set.
    Oil the screws first.
     
    MF 168 and Lincs Lass like this.
  14. Lincs Lass

    Lincs Lass Member

    Location:
    north lincs
    No as the thread holes are molded into the casting,this is the top view ,just make out two of the holes
    [​IMG]
     
  15. ACEngineering

    ACEngineering Member

    Location:
    Oxon
    can you not use a self tapping screw???

    otherwise this stuff is very good, bit thick though but if you can warm the hole up this thick paste turns runny so would be ideal to run in and let the air pockets out filling it nicely. once set for 24 hours its rock hard so should be able to drill and re thread it.

    https://www.ebay.co.uk/itm/Genuine-...701714?hash=item3d6d2d7912:g:5eMAAOSw1CRbUGzi
     
  16. Lincs Lass

    Lincs Lass Member

    Location:
    north lincs
    sometime in its life ,some muppet lost the original screws and put in a self tappers ,except the ones they used did more damage ,,trying to get the holes back to the original size
     
    ACEngineering likes this.
  17. Mursal

    Mursal Member

    And you haven't any original threads down at the very bottom of the hole where they couldn't damage them with the self tapper? If so, 4mm fully threaded set screws and then tighten the nut?
     
    Last edited: Mar 11, 2019
  18. Mursal

    Mursal Member

    If you run a nut up on one slightly too long, tighten it to the bottom of the hole (be careful not to break out the casing) then tighten the nut on the cover.

    [​IMG]
     
    Grassman likes this.
  19. bobk

    bobk Member

    Location:
    stafford
    Chuck it in the bin , nobody gives a good chainsaw away.
     
  20. Lincs Lass

    Lincs Lass Member

    Location:
    north lincs
    Are ,see now what you ment ,,it wont work as the cover has to fit slightly behind the flywheel cover and under the chain brake handle ,,its a tight fit as it is without trying to get it over something stuck up ,,filling the holes and tapping them out is the only option
     

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