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Couple of tiny iron filings

Discussion in 'Norton Commando Motorcycles (Classic)' started by Supercat, Nov 10, 2019.

  1. Supercat

    Supercat

    Joined:
    Aug 23, 2017
    Hey there,

    I drained the sump yesterday after two or three weeks without a ride. When I did I noticed a couple of very tiny iron filings on the magnetic plug. There were small enough that they were almost undetectable, but I looked at them very closely and could see what they were. There were maybe 2 or 3. Should I be concerned, or is this pretty normal?

    Thanks!
     
  2. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    Normal. Layshaft bearing replacement way more important.
     
    Nater_Potater and Supercat like this.
  3. Supercat

    Supercat

    Joined:
    Aug 23, 2017
    Awesome! Thanks Torontonian - so you're saying that this is an indication that I should replace the layshaft bearing?
     
  4. Triton Thrasher

    Triton Thrasher

    Joined:
    Feb 10, 2009
    It’s normal and it’s nothing to do with the layshaft bearings.
     
    Supercat likes this.
  5. Supercat

    Supercat

    Joined:
    Aug 23, 2017
    Thanks Triton Thrasher! Great news all around :).
     
  6. lazyeye6

    lazyeye6

    Joined:
    Feb 28, 2014
    If you haven't, you should. Though......when I did, I removed a perfectly fine Portugese layshaft bearing with 24,000 miles on it.

    I have gotten the occasional fleck of metallic bit along with a minute amount of metallic fuzz on the magnetic plug going back
    15 years. Could be from rings, cam, followers, rocker arms. if it increases I will be concerned.
     
    Supercat likes this.
  7. concours

    concours VIP MEMBER

    Joined:
    Dec 29, 2011
    Engine sump correct?
     
  8. concours

    concours VIP MEMBER

    Joined:
    Dec 29, 2011
    0D497BB0-1CB8-4EAA-88DD-9B643585DB1B.jpeg
     
    Supercat likes this.
  9. Supercat

    Supercat

    Joined:
    Aug 23, 2017
    Thanks Lazyeye. I haven't done the layshaft bearing, but the PO may have. I'm planning to check in with him over the winter to see. If he didn't do it, it'll be a good cold season project.
     
  10. Supercat

    Supercat

    Joined:
    Aug 23, 2017
    Thanks Concours!! It was much less than is visible in your photo, but I didn't put that many miles on since the last oil change.
     
  11. concours

    concours VIP MEMBER

    Joined:
    Dec 29, 2011
  12. 850commando

    850commando

    Joined:
    Nov 1, 2014
    concours; you know how to give a guy nightmares...:(
     
  13. concours

    concours VIP MEMBER

    Joined:
    Dec 29, 2011
    Believe me, I had them. :eek:
    Finally, I had to act on them.
     
  14. kommando

    kommando

    Joined:
    May 7, 2005
    I got rid of my regular oil change magnet fur by changing to fully synthetic oil. Magnet how comes out clean.
     
  15. Staytite

    Staytite

    Joined:
    Oct 15, 2011
    Hi Kommando,
    Which oil(s) did you use historically ?
    Which fully synthetic oil ?
    How do they correspond to Comnoz's excellent study ?
     
    Last edited: Nov 14, 2019 at 10:02 AM
  16. kommando

    kommando

    Joined:
    May 7, 2005
    I changed to this

    https://www.millersoils-shop.co.uk/cfs-10w60-engine-oil

    I went into a local rally car workshop and got them to do some alloy welding for me, they had this oil on the shelf and I asked what its use was. They explained it was the fix needed for souped up Ford Escort MK2 engines that had been suffering from oil blowby then suffer low oil level and ruin an engine in one meeting despite top up's after every stage, this was the only oil that did not do the oil blowby and engines survived and never over heated either. Thought that was worth a punt in an air cooled engine and have stuck with it, once my last can is empty I will be changing to something off Comnoz's list and the magnet test will decide if I stay with the Comnoz oil or stick with the CFS.
     

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