Home Forums General Counties Cars Discussion A40 Somerset king pin bush reamers

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  • #4469
    charlie-farlie
    Participant

    Hi folks.

    Can anyone please tell me where I can find a suitable set of reamers for the king pin bushes, please? Failing that, if anyone can tell me the correct sizes and whether expandable reamers will do the job, I would be most grateful. I currently have one side of my car in pieces on my hoist

    I am aware that the club has a pair of 18G 64 and 18G 65 reamers that they loan out but for obvious reasons at the moment, I cannot contact anyone about them.

    Many thanks.

    Kindest regards

    Robin

    #4477
    number5
    Participant

    Hi–if reamers cannot be obtained,  to reach the desired bush diameter, a small brake cylinder honer can be used in the same manner a main piston bore is linished.  When the new bushes are pressed in, they will be parallel, and with carefull use of the honing tool, and some fine paste,   the soft bush material is easily be able to be removed.  Do the top first, and I would suggest initially to a tight, but turnable fit with oil.  Then, after undertaking the bottom bush, with the top bush allowing the swivel shaft to be entered into the assembly,  the bottom shaft section can then also be gradually fitted into its bush, again with a tight, turnable fit with oil.  Knowing that the top bush was deliberately  tight, once the bottom bush is first able to accept its section of the shaft,  with the swivel pin removed, the top bush can then be given a final “clean” to ensure it clearance is free and correct, then with this done, the swivel pin can then be again re-inserted from the base to check its clearance and be adjusted accordingly.  A good cleaning at the end is necessary to ensure all grinding paste is removed.  Done with care, it does work.

    Hope I have explained this adequately enough.

    All the best-Peter.

    #4479
    charlie-farlie
    Participant

    Hi Peter.

    Many thanks for your message. Thank you also for the advice of doing them tight with oil. I don’t remember doing that when I did the king pins on my Austin Seven, but it was a long time ago!

    I did consider a cylinder honer as I have one that I purchased years ago  when I was unable to obtain wheel cylinders for my Vauxhall 12/6.  I still have more work to do removing the rust from the new king pins. Ray obviously had them in stock for a long time and they have quite a lot of surface rust on them.

    The other thing that I considered was to buy some adjustable expanding reamers and gently using those. I have three grades of grinding paste and I suspect the ultra fine will be most suitable.

    With regards to cleaning up afterwards, I am meticulous about cleaning everything that I work on. I have a small parts washer so this will be easy to do.  When it is reassembled, everything will be as clean as the bodywork! I need to get the job finished so I can free up my hoist to work on my wife’s Figgy.

    Thanks again for taking the time to reply.

    Kindest regards and best wishes.

    Robin

    #4481
    MikeN
    Participant

    Years ago I did the king pin bushes on my A35 using expanding reamers. But I was fortunate to have had the use of a set with the the screw on pilot guides.

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