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Leak Down Test (Don't Laugh!!)

Discussion in 'Norton Commando Motorcycles (Classic)' started by click, Jan 27, 2018.

  1. cliffa

    cliffa

    Joined:
    May 26, 2013
    Hi click, this thread has been quiet long enough. What's the latest? (about the bike not the whiskey)

    Have you had any discussions / thought on Mikes suggestion to bed in the rings dry?


    Cheers,

    cliffa
     
  2. click

    click VIP MEMBER

    Joined:
    Dec 27, 2008
    Just been pottering with the Norton, not a lot of things need doing!

    Barrels are with Jim C. so just waiting for him to get back to me on when he will get a chance to work on them!

    TBH, when it comes to advice on running in etc. I'll take my lead from Jim C., no disrespect to Mike & others on this forum :)

    I don't think I'd have the neck to run-in rings/bone dry!! I understand the principal & have done some research on the pro & cons but it's not for me!
     
    Last edited: Mar 19, 2018
  3. click

    click VIP MEMBER

    Joined:
    Dec 27, 2008
    I'm sure you have all been loosing sleep worrying about how I'm getting on . . . . . .:rolleyes:

    Got word back from Jim C., 4-6 weeks to get work done, good news is that the 880 pistons are available.

    I've a list of small jobs I'd like to do on the Norton so I'll start working through this list, always something to do in the world of Norton's!
     
  4. Mr. Rick

    Mr. Rick VIP MEMBER

    Joined:
    Feb 6, 2009
    We have a 26 page investment in this issue, so yes, still interested. Thanks for the update.
     
  5. Mr. Rick

    Mr. Rick VIP MEMBER

    Joined:
    Feb 6, 2009
    Okay, click, we gave you the 4-6 weeks you needed. Are you still on the path?
     
  6. click

    click VIP MEMBER

    Joined:
    Dec 27, 2008
    Bike still on the bench.

    Last email from Jim said he had the pistons but was waiting for the liners, he's a busy guy!

    Have no fear, as soon as I get the barrels & pistons back, I'll update you all with plenty of pics :)
     
  7. comnoz

    comnoz VIP MEMBER

    Joined:
    Dec 10, 2008
    The liners [finally] showed up yesterday.
     
  8. click

    click VIP MEMBER

    Joined:
    Dec 27, 2008
    Th
    Thanks for the update Jim, get the big hammer out & start bashing ;-)
     
  9. click

    click VIP MEMBER

    Joined:
    Dec 27, 2008
    I'm sure you guys have been loosing sleep over my Norton woes:rolleyes:

    Jim has the sleeves installed and bored to piston size, he thought he could just hone the oversize gudgeon pin hole required to fit the 920 gudgeon pins but found he will have to offset the bore to get them right requiring Jim to make a jig to hold the piston!!

    All way above my pay grade but I'm happy that one of if not the best Norton engineer on the planet is on the case.

    Going to be a winter rebuild at this stage, managed to get 2.5k done touring Scotland and another 3k on trips around Ireland, mostly on more modern bikes but I had the 1970 Triumph T100 out for a fair few spins, so the summer was far from a washout:)

    More anon
     
    Nater_Potater likes this.
  10. cliffa

    cliffa

    Joined:
    May 26, 2013
    Nice to see the Irish flag flying !

    Thanks for the update click.

    Cheers,

    cliffa.
     
  11. Stillreel

    Stillreel

    Joined:
    Sep 30, 2011
    Might be over-thinking this a bit. Run it a bit longer, see if it settles. My re-built 750 was a little ornery at first but spins like a top now. And no smoke.
     
  12. click

    click VIP MEMBER

    Joined:
    Dec 27, 2008
  13. dave M

    dave M

    Joined:
    Oct 19, 2005
    Your idea of taking it for a hundred mile ride and then reassessing is a good one. Set the oil level (warmed up) to a known point before you ride off and measure after the ride to see if there is significant oil useage. It might achieve nothing other than another enjoyable ride on your Norton but it’s got to be worth the effort.
     
  14. Mr. Rick

    Mr. Rick VIP MEMBER

    Joined:
    Feb 6, 2009
    Thanks for the update, click. Not actually losing sleep, but I was thinking about you just yesterday, ya.
    Don't quite understand why the 920 is presenting piston pin issues, but yes, you have the right guy on the job, for sure.
    Please do keep us posted.
     
  15. click

    click VIP MEMBER

    Joined:
    Dec 27, 2008
    That ship has sailed!, barrels are off & getting worked on.
     
  16. click

    click VIP MEMBER

    Joined:
    Dec 27, 2008
    It's hard to keep up on such a long thread!

    The 920 conversion was already done to the Norton just before I purchased it and was from Norvil, they used, I think, a Cosworth piston which has a larger gudgeon pin than the standard piston.

    Since my bore & pistons were stuffed I only had 3 options:

    1. Get oversize Norvil 920 pistons & get the barrels rebored. I didn't want to go this route for lots of reasons, mainly after talking to the guru in Norvil and asking him a few basic questions and getting fogged off with nonsense answers I decided not to take the risk.

    2. Strip the entire engine, split the cases, replace the conrods with standard ones & rebuild as a standard 850. After much head scratching I didn't want to financially sink the type of money I would need to spend on this option. I would have to get an engine builder to take the work on as I know my limits. I got a few quotes and decided this was not an option for me.

    3. Along came Jim with an offer to convert the barrels to an 880 and supply 880 pistons with the larger gudgeon pin hole so I can use the existing conrods which means I don't have to split the bottom end.

    Time will tell if this will all work out, I thought and still think it's worth a try, whats the worse that can happen:rolleyes:
     
    Last edited: Aug 12, 2018 at 1:58 AM
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