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Gearbox breather bolt problems

Discussion in 'V7/V85/V9 Chat & Tech' started by Bobby, Nov 13, 2017.

  1. Bobby

    Bobby Tuned and Synch'ed GT Famiglia

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    Hi guys, having a bit of an issue with my gearbox breather bolt on my 13' V7 and hoping you can help me out. It keeps on weeping a good amount of oil and from what I understand you're supposed to remove the bolt and blow through the hole to stop that from happening. I just can't remove the damn bolt. It unscrews a bit and then just spins and won't unscrew any more. So is there some kind of trick to getting this thing out?
     
  2. john zibell

    john zibell Moderator Staff Member GT Famiglia

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    Sounds like Luigi over tightened it at the factory and damages the threads. If you can tighten it do so. When you change the gearbox oil, see if you can somehow clean the vent with either compressed air, or solvent. If you use solvent, leave the gearbox open for some time to allow all the solvent to evaporate before putting in fresh oil. Also confirm that the gearbox is not over filled.

    You might be able to remove it If you could lift up while turning, but putting it back in could be problematic. If under warranty I would have a dealer fix this as you may need a new gearbox case, or at least have the case repaired.

    Back when the big block 5 speeds vented through the shift drum detente spring pumping oil was common if non synthetic was used. I found switching to Mobil one gear oil prevented this type breather having a problem. Might be worth a try in your case.
     
    Bobby likes this.
  3. Bobby

    Bobby Tuned and Synch'ed GT Famiglia

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    Thanks John. I will try the solvent & compressed air next time I change out the oil. Been using a liter of agip eni 85W-90 gear oil but I will give the Mobil one a shot also. Bike is way out of warranty and I'm guessing a new gearbox case won't be cheap so this might be something I have to live with. I just wonder how much oil I can lose before causing damage to the tranny.
     
  4. Brian UK

    Brian UK GT Reference

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    Is there a tube connected to the breather? I thought that was now standard, and should prevent loss of oil.
     
  5. john zibell

    john zibell Moderator Staff Member GT Famiglia

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    Bobby, Does you bike have a center stand? Even with one it is difficult to drain all the oil. On the next fill, try just adding 900cc and see how that works. It should be plenty of oil as it will splash around quite a bit and should lubricate properly with that amount. BTW, I have quite a bit of 5 speed big block experience, the specification was 750cc, but I would only put in 700 to prevent pressure problems since there is always oil remaining when you drain a gearbox.
     
  6. Bobby

    Bobby Tuned and Synch'ed GT Famiglia

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    Brian, no tube, just a bolt above the gearbox that's supposed relieve pressure. Tube might be a V7II or III feature.

    John, no center stand but I just sit on the bike and rock it back and forth for about 2 beers. I'm definitely gonna try less oil next time. Still wish I could remove the bolt because the washer is chewed to sh!t with all the loosening & re-tightening but whatever. You might be right about it being overfilled because I just rode 20 miles on the freeway today with no visible weeping, but I was fiddling with the bolt lastnight so who knows. Sometimes it's a weeping widow, other times nothing at all. Feels like excessive rev-matching and heavy acceleration in 5th causes it to happen more. Thanks for all the tips!
     

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