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Black powder in B4.1 diff

Discussion in 'RC10 / B2 / B3 / B4.x / B5 / B5M / B6 / B6D' started by Martijn, Jun 21, 2012.

  1. Martijn

    Martijn Well-Known Member

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    Hi,

    I rebuild my B4.1 diff today and found that was black powder inside my diff..
    The idler gear was worn at the top of the teeth.
    I also noticed there were some little chips off of the top shaft.
    I think this causes to wear the idler much faster?

    Also the bigger gear seems the be worn a bit. the teeth are sharper. I got this gear for 1.5 years I think, same age a my B4.1 .

    I was looking a the X factory top shaft since this fits the B4.1 also and I heard the quality is much better.

    Last but not least :p
    I'm running silicon grease now, I'v also heard some people are running silicon oil 50wt
    But won't this leak out of the diff housing?

    What do you use in your diff?

    Thanks
     
  2. AERacer

    AERacer Administrator Staff Member Moderator Factory Member

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    Black powder inside your tranny? Basically, the smaller the gear is, the faster it rotates. I think it is normal to have such wear after 1.5 year. The tranny is a "closed" gear system, as soon as a teeth break, the plastic goes all around in the tranny and wears others parts quickly. Input shaft is made of metal but will also wear overtime. Does your B4.1 uses ball diff (kit) or a spider gear diff (RTR) ? I use AE black grease in my ball diff and also I apply a little bit on the idler gear
     
  3. Martijn

    Martijn Well-Known Member

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    I have a ball diff.
    I use the silicone grease on the gears but might try the black grease now
     
  4. tmail61

    tmail61 Well-Known Member Factory Member

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    1.5 YEAR!!!! o_O

    Over time silicone grease can dry out, turn black from use and look like power.

    1.5 YEAR!!!! The most I ever got out of a ball diff was 9 months!!!!!
     
  5. Martijn

    Martijn Well-Known Member

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    Noo, the gears are 1.5 years old
    I rebuild my diff every month..
     
  6. london

    london Member

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    i just checked mine out yesterday and half of the gear diff is worn away and the other side of it the teeth are fine and the other gears are just fine...any ideas why this would happen?
     
  7. Martijn

    Martijn Well-Known Member

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    You mean the idler gear thats worn?
    I think thats because of the steel topshaft.
     
  8. london

    london Member

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    no the diff gear itself is half worn on one side of it.. never seen nothing like it! i have a ball diff to throw in it and try..but i was just wondering if anyone would know why this would happen
     
  9. Martijn

    Martijn Well-Known Member

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    Never had this problem.. Pretty strange actually :p maybe a small rock that waq inside you tranny?

    Only thing I had with my old T4 was that the middle part of the ball diff gear was lose from the gear itself and all the balls were melted in the plastic..

    You're running a gear diff?
     
  10. london

    london Member

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    it was probably sumtin like a lil rock...i was runnin a gear diff but since i don't have a new one yet... i'm gonna try out a ball diff i have laying around and see what the difference is
     
  11. Martijn

    Martijn Well-Known Member

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    Try to sand the diff rings with 600grit sandpaper, makes it suuuuper smooth
     
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  12. london

    london Member

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    will do...thanks for your input! appreciate it
     
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  13. Bubba Boggs

    Bubba Boggs Well-Known Member Factory Member

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    If its wearing on one side it likely to have something like you said or even a small chip from the gear. With that tight tollerance it dont take much. As for the black stuff. Its not uncommon. Dust mixed in with the grease.
     
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  14. AERacer

    AERacer Administrator Staff Member Moderator Factory Member

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    It resumes to, inspect, replace and rebuild :) LOL
     
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  15. Martijn

    Martijn Well-Known Member

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    I heard some people run lithium grease on the gears. Is there someone here who does this to?
    Or do you just use the clear diff grease?
     
  16. AERacer

    AERacer Administrator Staff Member Moderator Factory Member

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    When I build my tranny, I use black grease for the ball diff and I put a very tinny amount of grease on the idle gear. That's all I do
     
  17. Bubba Boggs

    Bubba Boggs Well-Known Member Factory Member

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    For the I just 20wt shock oil in 4 small spots on the diff gear. This is one of those things thats therea million right ways to do it. Even running it dry. Only reason I use it is just to make it quiter.
     
  18. Bubba Boggs

    Bubba Boggs Well-Known Member Factory Member

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    You use black grease on the diff balls or the thrust balls?
     
  19. AERacer

    AERacer Administrator Staff Member Moderator Factory Member

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    On both
     
  20. Bubba Boggs

    Bubba Boggs Well-Known Member Factory Member

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    OH... Youll get a better diff using the diff lube on the balls and the black grease on the thrust balls plus less of a mess on the rebuild. The silicone diff lube stays in place better than the grease. But im not gonna tell ya how to build it. If it works for you then awesome.
     

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