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    Drive line noise
    #1
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    Hi.
    I have a st3 with piranha ii rear axle.
    I have strange noises and the chain jumps while. its all shown in the video.
    Can someone diagnose the problem? it is hard to hear because of the engine but you can hear knocks.
    Thanks

    Last edited by K-fab; 11-11-2020 at 01:49 PM.
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    Re: Drive line noise
    #2
    Millenium Member Deranged's Avatar
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    Allendale MI
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    It looks like the center spool bearings are shot. In the video I see the brake caliper moving around indicating that something is loose. I would pull the chain off the rear sprocket and see of the rear sprocket is loose. I bet that is your issue.

    Justin
    Nowhere near the desert.
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    Re: Drive line noise
    #3
    Keeper of the Asylum K-fab's Avatar
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    Scottsdale, AZ. 10.9 miles from the trailheads
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    I'll side with deranged on something being loose or bent.
    Definitely a cyclic movement in the caliper - I'd be looking at the bearing on the chain side.

    I fixed the video so it's displayed instead of a link too. Hope you don't mind.
    Sand is for fast cars

    Dirt is for fast drivers



    Yellow Dog Racing
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    Re: Drive line noise
    #4
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    Aside from the previously mentioned, look for stuck/bent links in the chain.
    Marine Veteran Sgt USMC 8151/8541 1992-2000
    Process Improvement Specialist Miller Electric MFG LLC
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    Re: Drive line noise
    #5
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    I was not able to view the video but also check to see if the chain has stretched, if you jack the car up and roll the wheels you may see the chain riding up on the sprocket then dropping back, this happened to my car at Glamis last year in the wet sand, got a little unexpected traction an just stretched a short section, like the distance between the counter shaft sprocket and the rear sprocket
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    Re: Drive line noise
    #6
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    Thanks for the help.
    As for the loose parts - its all tightened and the caliper is moving because that tha disc's hub has some axial runout.
    The sprocket has a small radial runout so the chain goes a bit tight and loose along the sprocket rotation. even though, i do not see the chain bumps in a way that can cause this noises.
    I think that the bearing is a good direction. havent thought about it.
    Any other directions?
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    Re: Drive line noise
    #7
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    Hi.
    I took the transmission apart.
    The bearing near the sprocket seems undameged but has some axial runout but not radial (Shown at the video). Can use some of your wisdom here.
    The clutch body seems damaged but i cannot tell if this is an old problem before it was on the buggy.
    So far this is what i've found.
    What do you say?



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    Re: Drive line noise
    #8
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    By the way - all gears making that knockings except neutral.

    I took the clutch apart and everything looks good. Friction plates and thrust bearing seems ok.

    Sent from my Redmi Note 9 Pro using Tapatalk
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