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anti drain valve request

Discussion in 'Norton Commando Motorcycles (Classic)' started by oldbeezer, Apr 16, 2018.

  1. oldbeezer

    oldbeezer VIP MEMBER

    Nov 2, 2017
    worntorn, please post the picture of your anti drain valve you mentioned in the "goof-proof" thread. I would like to see how it is done. I realize that the goof proof thread is locked so please use this thread. thanks
  2. worntorn


    Dec 22, 2006
    And it needed locking!

    Will do
    Photobucket has eaten my photos on an old thread here. I'll see if I can find some others or take new photos.

  3. Deets55

    Deets55 VIP MEMBER

    Oct 3, 2013
    valve.jpg valve 2.jpg

    Glen's valve.
    Valve must be open to remove the key.
    I'm sure Glen can explain it better than me.
  4. Fast Eddie

    Fast Eddie VIP MEMBER

    Oct 4, 2013
    I’m out of tune!

    What does DIP mean?
  5. Triton Thrasher

    Triton Thrasher

    Feb 10, 2009
    I have no idea what it means.
  6. JimC


    Oct 12, 2007

    It may be you who is too obscure.
  7. worntorn


    Dec 22, 2006
    I was just about to post and saw that Pete has got it already.

    Here are a couple of photos of the valve on the bike, but with a different key attached ( round key)

    I feel good that it's dip. :D

    Above 50 f it generally looks like this

    Below 50 f it looks this way ( storage)

  8. baz

    baz VIP MEMBER

    May 26, 2010
    No doubt I'm going to be hung drawn and quartered for this but this is my experience
    About 25 years or so ago I had a mk2a I fitted an on off valve to the oil tank thinking I'll never forget that!!!
    But the enevitable happened one morning on my way to work (late as usual) I forgot to turn the oil on,
    I got approximately 7 miles before I heard a distinct rattling noise and the bike started to slow up
    I instantly turned the oil on and the bike quietened down
    I pulled to the side of the road and let it tickover for a bit then rode 3 more miles to work
    I'd just caught it in time there was no harm done at all I rode that bike for maybe 2 more years after that,
    So when I built my next commando the 750 I still have, I fitted the Rgm velocette valve
    I have never had a problem with this for close to 20 years
    Whenever I change the oil I always make sure the feed pipe is fully purged and it's been fine
    But having read of these valves failing I decided to fit one of the oil pressure sensors that "madass" sells so if the valve was to fail the light would warn me and I could shut the motor down
    After all on my mk2a it took 7 miles before it started to nip up
    I also think a valve that locks out with a key is a brilliant idea
    As I said I expect I'll get hung for this but I couldn't really care less to be honest
    cliffa and Nater_Potater like this.
  9. MexicoMike


    Jan 31, 2010
    Anti-drainback/wet sump valves... STOP THE INSANITY! It's a fix that can only cause a problem. It cannot FIX anything because nothing is broken. If the bike wetsumps so badly that it drains all the oil in a few days, FIX the oil pump clearances per the Norton service manual. Once that's done, it won't wetsump enough to matter (below the oil tank's output fitting) for at least 6-8 weeks.

    If you cannot start the bike every 6-8 weeks, then add oil to the tank above the output fitting and let it run. After the engine has run for a while and after shutdown, remove the excess oil from the tank as needed with any number of appropriate tools.
    JimC likes this.
  10. worntorn


    Dec 22, 2006
    Here we go again:confused:
  11. JimC


    Oct 12, 2007

    Stupid is as stupid does.
  12. MexicoMike


    Jan 31, 2010
  13. Craig

    Craig VIP MEMBER

    Dec 20, 2005
    The younger guy across street from me uses electric grass mower .... he always pulls all the cord behind him to starting position.... then spends afternoon fighting with his cord as he tries to mow back to opposite side of lawn ... eventually he will mow his cord .... there is a better way but I just leave him to it .... maybe when he my age the light will come on but it won’t be me that flips that switch... I do live with anti-drain valve from CNW and could care less what the experts have to say .... different strokes , eh
  14. bill


    Jun 1, 2003
    mike you of all people should know there are more issues in the norton oil pump than the end clearance of the pressure side gears to stop/slow down the oil from reaching the sump.there is gear tip to housing,tip to tip and shaft's to housing all can contribute to wet sumping.

  15. Tornado

    Tornado VIP MEMBER

    Dec 5, 2017
    Looks like this setup could be straightforward to replicate. When first described I was envisioning some kind of tumbler for the key to lock/unlock the valve. Now I see the key is just bolted to the valve open/close lever and the lever can be pulled off valve so key can then be used in ignition switch.

    Thanks for the pics...got my brain thinking now...

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