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Norge 8V OIl in Airbox but low oil level? Huh?

Discussion in 'BNS12 Chat & Tech' started by David Bracey, Oct 23, 2020.

  1. David Bracey

    David Bracey Tuned and Synch'ed GT Contributor

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    Hi guys, thanks again for sparing your time to chip in to help me out – appreciated.

    So, forgive the lengthy post but I have a few questions and ideas to float past the collective brainpower of this group.

    Firstly, this bike does not have a low oil level, despite the warning light coming on when hot. The dipstick still shows oil in between the bottom and top markings. From what you’ve told me so far this could still actually be considered to be ‘over-full’ and oil could accumulate in the airbox.

    The sump gasket may be leaking but the oil leak was from between the vee’s higher up so has dripped down over the sump so it’s not yet possible to tell if there’s a leak there also. But I think you’re on to something when you suggest it’s something that expands when the bike is hot.

    Having removed the airbox I saw oil around the pressure switch.

    Guzzitech1.png

    The pressure switch wasn’t loose but it undid without a great deal of effort so I expect this was leaking when hot. I’ll replace the switch as well, just in case it’s faulty. The oil over the electrical connector and inside, around the terminals is more baffling but I did have a split breather pipe so am putting it down to that.

    Guzzitech2.png

    I was also concerned with the state of the wiring and rubber boots on connectors in this area. I know it gets hot in there, but I would have hoped they’d stand up to it. Is this normal? I shall try and get some adhesive heat-shrink over the boots. I’ve also re-routed the cabling a bit to keep it from resting on the cylinders.

    Guzzitech3.png

    The RH breather pipe was kinked badly so I can’t believe that cylinder has been breathing properly. I’ll replace both of those pipes.

    Guzzitech4.png

    So, I am hoping that now I have cleaned up, snd when I’ve replaced breather pipes, replaced the pressure switch with new crush washers, cleaned the stepper motor and reassembled, I should be leak free and warning light free.

    6589DE4B-4AF9-4F63-AAD1-A0D85AEB02E6.jpeg

    Whilst it’s in pieces is there anything else I should do and does my description/thought process above sound sensible?

    I hope to repay the favour with you guys sometime.

    Thanks,

    David
     
    Last edited: Nov 21, 2020
  2. Raven

    Raven High Miler GT Famiglia

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    My boots were in similar shape.
    The sump gasket leak is internal, not external. Oil will not be visibly leaking. The gasket leak allows enough of a pressure drop to trigger the low oil pressure light when the engine is hot and idling. Usually if you increase the revs slightly, the light goes out.
    Now would be a good time to eliminate the charcoal canister and all it's plumbing. There is plenty of info on the forum on how to do it. I don't know if your bike is inspected each year where you live as that could be a problem. It is part of the emissions system.
     
    David Bracey likes this.
  3. David Bracey

    David Bracey Tuned and Synch'ed GT Contributor

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    Hi Raven, thanks for that. That makes total sense now so I think I’ll replace the gaskets to be on the safe side.

    We have something yearly called an MOT which is a ministry of transport vehicle inspection and they measure emissions.

    David
     
    Last edited: Nov 21, 2020
  4. scottmastrocinque

    scottmastrocinque Scott Mastrocinque GT Famiglia

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    That pinched breather pipe is probably part of your airbox oil issue as the the air pressure is significantly raised by that narrowing.

    However, I really want you to understand the internal oil leak location.

    If you look at the gasket, you will see the large rectangle area with all the holes. This is where the oil pump, bolts in onto the engine block. If there is a tear or it’s not tightened properly, or any other sealing issue between the pump and oil lines and that gasket, especially as it gets hot down there, pressure can drop significantly, triggering the warning light.

    Good Luck!

    B3A01AD4-8052-44F6-B891-A2D1283DE2FC.jpeg
     
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  5. David Bracey

    David Bracey Tuned and Synch'ed GT Contributor

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    Thanks all, I’ve ordered both gaskets so that I can replace them if necessary.

    Just been for a spirited 35mile ride through wonderful autumnal Kentish countryside and no warning lights or oil discharge/leaks so far. The breather pipes and pressure switch appears to have been the problem but time will tell.

    David
     

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