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  1. #1
    wakeboardmuppet's Avatar
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    Failed SHO Supercharger Shaft

    This was a replacement shaft that I had made, and it failed. The threads snapped off under load after about 15 hours.

    What a mess. That was a C3 wheel and was working fine up until then

    Jerry has put me in touch with Bill at R&D. Hopefully he can salvage something from it for me.

    Anyone else had similar problems/solutions?
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  2. #2
    krenzema's Avatar
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    How did you get so much corrosion on your s/c housing?

  3. #3
    SHOTIME's Avatar
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    what was the material that the replacement shaft was made of? was it comparable to the original? looks like its time for a C-5, maybe the machining they do for the C-5 install would clean-up the gouges in your housing!! sorry about your luck with all this!

  4. #4
    hitman's Avatar
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    Very sorry about the bad luck Muppet. Let us know how it turns out.

  5. #5
    wakeboardmuppet's Avatar
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    Well, it may have taken six months, but my ski is running again.

    I've had a new shaft made (and a spare just in case). This one is made from H13 Steel which is the steel punches etc are made from. It has also been case hardened and the threads have been increased from the manufacturers 6mm to the maximum 8mm of the shaft. (might be able to see this in the photo)

    In theory this should be as strong as the shaft can be made. Especially at the part where they all seem to be breaking. I'm a little concerned as to why Riva and R+D have made what appears to be a direct replica of the original, but presumably with better metal, but retaining the 6mm thread ??? Anyone got an opinion / view on this !

    The 2 shafts, 2 nuts, trimming up the damaged C3, and manufacturing an internal supercharger washer/spacer that I destroyed whilst dis-assembling the damaged shaft has cost a total of £200. Cheap compared to the $1000+ p+p that R&D quoted, however I didn't realise I'd be off the water for so long. I'm sure R&D are more on the ball.

    Water test tmoz in 5c. I'll let you know if it all goes wrong again.

    In case any of ya are wondering why I didn't just buy a new shaft from Riva or R&D, they weren't available when I started this repair
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  6. #6
    Kelly_A's Avatar
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    R&D shaft isn't a HKS knockoff - it's a total redesigned 1 piece billet with integral gear/shaft. They went with a 5/16-24 thread to replace the 6mm. E-Tech shaft appears similar to HKS but they also went with the larger thread. Couldn't find any info on the Riva thread size.

    6 months is a long time to be out of the water, glad you were able to get it finished.

  7. #7
    SHOBiz's Avatar
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    Hope this one works out. I've been out 3 months and I'm itching to get back on the lake without freezing to death.

  8. #8
    gordon lasiter #328's Avatar
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    Quote Originally Posted by Kelly_A View Post
    R&D shaft isn't a HKS knockoff - it's a total redesigned 1 piece billet with integral gear/shaft. They went with a 5/16-24 thread to replace the 6mm. E-Tech shaft appears similar to HKS but they also went with the larger thread. Couldn't find any info on the Riva thread size.

    6 months is a long time to be out of the water, glad you were able to get it finished.
    Here are pics from thr R&D C3-11 wheel and there s.c. race shaft which i am having installed on my SHO. i was motivated to go with the R&D shaft because it is a billet 1 piece design.
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  9. #9
    i will get all the rest i need when im dead corkycat's Avatar
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    i purchased an uprated shaft for my sho from the online store and compared it to my undamaged original and there was no difference whatsoever in size, diameter, colour or thread size... i just took it that it was made different????? the only 1 thing that was different was the shaft bearing this apears to be different in colour.. was i had????? who knows??????

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