Flushing gear box with ATF

Discussion in 'Sportster Models' started by rmarshall234, Feb 11, 2015.

  1. rmarshall234

    rmarshall234 Member

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    After replacing three of my clutch plates that were disintegrating in the gear box, I now want to "flush" the debris from the tranny. If it were a car's transmission I would drain the gear oil, add a quart of Automatic Transmission Fluid, run it briefly in the driveway, then drain and replace with gear oil. Before I do that on my Sporty, is there anything I should be aware of? Or, comments such as "dude that's a bad idea because....." would be appreciated.

    Thanks!
     
  2. Jack Klarich

    Jack Klarich Expert Member

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    Kerosene, or Marvel Mystery oil would work
    I used both with good results:D
     
  3. Breeze3at

    Breeze3at Well-Known Member

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    I see no harm. I would raise the rear wheel and go through the gears to make sure the ATF gets splashed all around in there. Then refill with a quality trans.fluid for Sportsters.
     
  4. dolt

    dolt Senior Member Contributor

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    Another fan of kerosene or diesel. Refill with Redline Heavy Shockproof. Do you know what caused the clutch plates to disintegrate?
     
  5. rmarshall234

    rmarshall234 Member

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    >Do you know what caused the clutch plates to disintegrate?

    I guess just mileage and relatively hard use. I purchased it new in 06 and it has 40K miles on it now. Most of my riding has been commuting to work and back on a two lane twisty road that I know really well.

    It was the center spring plate that was coming apart. A couple of rivets were sheared and a few small broken pieces were loose. The two friction plates on either side of it were toast but the rest of the plates were fine.
     
  6. rmarshall234

    rmarshall234 Member

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    Thanks for the advice guys. Good to know about the alternatives of using Kerosene or Marvel Mystery Oil. I have a couple quarts of ATF that will otherwise never get used, so I'll go ahead with that. Will definitely run it through the gears too.
     
  7. vonh12

    vonh12 Member

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    I use atf as a flush too. Usually in my cars engine just before an oil change. I add 1 liter of ATF bring it to temp then drain all the oil out. Got an "89" mx6T with just under 350k on it and never been rebuilt and a 2014 audi I do it to as well and all's good so far. Old diesel mechanics trick!!
     
  8. rmarshall234

    rmarshall234 Member

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    350K, wow! That is good to hear. A mechanic friend - way back when - mentioned that he used it to clean his hands after getting all greasy. Lots of detergents in that stuff it seems.