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V7ii Stone 2015 ,G'box oil out of breather.

Discussion in 'V7/V85/V9 Chat & Tech' started by Andy McFarlane, Jul 2, 2018.

  1. Andy McFarlane

    Andy McFarlane Just got it firing!

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    hello everyone , I have a problem with gearbox oil coming out of G'box breather, is this a known phenomenon , not happening all the time just occaisionaly, ( 3 times ) any help would be appreciated
    can't really describe what riding conditions it happens at , tho '
    seems to be when using higher revs for short bursts, ????
     
  2. vagrant

    vagrant Cruisin' Guzzisti GT Contributor

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    The 2015 takes 1 Liter and the 2017 1/2 L. Not sure on the 16 but if it doesn't have a oil level plug on the side I bet it's the 1/2. Too much and it's coming out!
     
  3. V700Steve

    V700Steve High Miler GT Contributor

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    If it is not over filled, you could let out 50cc and see how that works. I used to put a barb fitting on the SB from the 80's and run a vent hose up to frame rails.
     
  4. jpv7

    jpv7 Tuned and Synch'ed

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    I have the same bike, and can tell you it is sensitive to oil qty. I added 1/2 litre after 1st servicing, and it puked after running for several hours at 70+mph. So i drained it and put 450 ml in. Hasn't puked yet (1 year). But i haven't run it as hard as on the prior trip. So far so good.
     
  5. Andy McFarlane

    Andy McFarlane Just got it firing!

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    Thanks for this Will drain and refill as you suggest , Strangely here in England we are experiencing a prolonged period of high tempretures ( 30* + some days ) so wondered if this could be a factor !!!!
     
  6. Mick Simmons

    Mick Simmons Just got it firing!

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    I have to take my 2016 V7 to the dealers in November as Guzzi Technical department suspect that there is a problem with the clutch housing breather into the gearbox blowing oil out of the gearbox breather. They are going to strip the gearbox down to find out. Glad I'm not paying for it (unresolved warranty issue) Will let you know what they find.
     
  7. sib

    sib Cruisin' Guzzisti

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    On my '16 V7II, if you don't remove the filler cap when you drain the oil, it doesn't drain completely. Then, when you add 1/2 liter, it will be too full. Solution: remove both the filler and drain caps and let it drain fully before refilling it.
     
  8. Andy McFarlane

    Andy McFarlane Just got it firing!

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    Hi Mick, Yes please let me now outcome ,very interested, Thanks
     
  9. Mick Simmons

    Mick Simmons Just got it firing!

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    Bike not booked in until 15th Nov but I will post results adap
     
  10. vagrant

    vagrant Cruisin' Guzzisti GT Contributor

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    Good God man it's a couple of bucks to drain it and refill it right. I wouldn't let anybody touch my bike before trying this first. search for the other threads here with the same problem solved. these guys sound tool happy!
     
  11. Mick Simmons

    Mick Simmons Just got it firing!

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    I had already tried the oil quantity idea. As this is a warranty issue Mandelo del Lario have authorised (and are paying for) this. If the bike was not under warranty I would try to solve it myself.
     
  12. Mick Simmons

    Mick Simmons Just got it firing!

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    As promised, an update on gearbox leak from breather. Problem was gearbox breather system, gearbox seal on the driveshaft was sitting in too far causing pressure build up in the gearbox. Motoguzzi supplied new seal. No more problems. Reducing oil level can mask the problems by providing more space for pressure build up but doesn't fix the problem. My mechanic is first class but if you don't trust yours then you can choose to mask the issue. Good luck. Happy Guzzi.
     
  13. GuzziMoto

    GuzziMoto GT Reference GT Contributor

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    Where was the pressure coming from in the first place? There is no source of pressure in the gearbox.
     
  14. john zibell

    john zibell Moderator Staff Member GT Famiglia

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    If the vent isn't working properly heat generated from moving parts can cause a pressure build up.
     
  15. GuzziMoto

    GuzziMoto GT Reference GT Contributor

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    The amount of pressure from that would be fairly minor, but if the vent isn't working properly how would the oil be expelled out the vent?
    I am just questioning the logic that excess oil being expelled was from a problem with the breather system and the seal(s).
    I hope they managed to fix the problem, but if they did I suspect it was by luck.
     
  16. john zibell

    john zibell Moderator Staff Member GT Famiglia

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    On the old Eldorado loop frame, the gearbox vented through the shift drum detent spring. If heavy oil clogged the spring, the gearbox would pump oil out. Switching to synthetic solved the issue. Later bikes have a long tube routed high in the frame for oil expansion.
     
  17. Mick Simmons

    Mick Simmons Just got it firing!

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    I will have a conversation with the engineer and try to expand on the issue.
     

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