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  1. #1

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    What happened there?

    This is on a 2010 RXT-X 260 with a few mods on it. (E.T.137 x 4mm) slip was set at 16# if I remember correctly.
    All was good for a complete day, then lend it to a friend for a quick spin, came back said can't get more than 50mph out of it, so I thought "eco mode" nope, no boost!
    So pulled the charger to find no gear, no Mc Masters washers,no trust bearings either, found the nut and the end spacer but that is all.
    Already started pulling the motor(waiting on tools for drive shaft) but I would really like to know what happened to break the threaded end of the SC shaft like that.
    Any Ideals?
    Click image for larger version. 

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    Also, what's involved in "flushing" the engine?
    Just shoot break cleaner in every oil hole or?


  2. #2
    R-Doo's Avatar
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    Over torqued the nut. Foot pound not inch pounds?

  3. #3
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by Speedjunky64 View Post
    This is on a 2010 RXT-X 260 with a few mods on it. (E.T.137 x 4mm) slip was set at 16# if I remember correctly.
    All was good for a complete day, then lend it to a friend for a quick spin, came back said can't get more than 50mph out of it, so I thought "eco mode" nope, no boost!
    So pulled the charger to find no gear, no Mc Masters washers,no trust bearings either, found the nut and the end spacer but that is all.
    Already started pulling the motor(waiting on tools for drive shaft) but I would really like to know what happened to break the threaded end of the SC shaft like that.
    Any Ideals?
    Click image for larger version. 

Name:	20140709_104522[1].jpg 
Views:	153 
Size:	82.5 KB 
ID:	335290
    Also, what's involved in "flushing" the engine?
    Just shoot break cleaner in every oil hole or?
    I've posted this pic before......at 40,000+ rpm with increased slip the clutch washer eventually breaks apart. Now there is nothing to keep the gear in position and it flops around on the shaft until it too breaks.......
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  4. #4
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    My guess is that clutch was locked the F up!

    The coating is ripped off the inner washer.

    OEM washers seem to hold up good to 12 lbs of slip.... after that your taking a gamble with them IMO.

  5. #5
    SplishSplash's Avatar
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    Does the supercharger shaft still rotate? the teeth for the spacer gear are rounded off too. Meaning the spacer gear was striping the shaft teeth off. ouch

  6. #6

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    Quote Originally Posted by R-Doo View Post
    Over torqued the nut. Foot pound not inch pounds?
    Purchased an "inch" pound wrench just for this purpose.

  7. #7

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    Quote Originally Posted by SplishSplash View Post
    Does the supercharger shaft still rotate? the teeth for the spacer gear are rounded off too. Meaning the spacer gear was striping the shaft teeth off. ouch
    Yes, shaft rotates just as it should.No damage to impeller.

  8. #8

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    Quote Originally Posted by BigDaddyRXP View Post
    My guess is that clutch was locked the F up!

    The coating is ripped off the inner washer.

    OEM washers seem to hold up good to 12 lbs of slip.... after that your taking a gamble with them IMO.
    Took lot's of time to dial in the slip for it, so if it did lock the F up, then why?

  9. #9
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    looks to me like the nut was over tightened.

  10. #10
    SplishSplash's Avatar
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    Looks like the drive splines for the lock washer stripped, if they do, then the lock washer would rotate with the drive gear and all the drive forces would be on the nut instead of the lock washer. May have spun the end of the shaft with the nut, right off.

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