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trans clatter at Idle

Discussion in 'XJ Technical Chat' started by 550FAN, Jul 28, 2009.

  1. 550FAN

    550FAN Member

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    I can hear a clatter at Idle, coming from the transmission area, goes away when revving. Also noticed with the sprocket cover off there is a lot of rotational freeplay when in gear. Is my Tranny ready to go?
     
    550FAN, Jul 28, 2009
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  2. stereomind

    stereomind Active Member

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    Does it get quieter when you pull the clutch in?

    The clatter you're hearing is "normal" for the 550's. I thought mine was going out too, but after almost 8K miles, it sounds exactly the same.

    From what I understand (BigFitz has a better explanation), the primary chain tensioner is oil-pressure operated. At low RPM's, it slaps around a bit due to low oil pressure.
     
    stereomind, Jul 28, 2009
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  3. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Stereo, you prettty much summed it up. The 550s (not the bigger bikes) actually use the primary chain to drive the trans. It does have an oil-pressure operated tensioner; and the clutches are inherently noisy to begin with. All those factors contribute to quite a bit of clatter at idle.

    It pretty much goes completely away as soon as you rev it up, right?

    Both mine do it, the one with 23K a bit more than the one with 8K, but they both do it. Once I learned about the tensioner, I quit worrying about it.
     
    bigfitz52, Jul 28, 2009
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  4. 550FAN

    550FAN Member

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    Yup, As soon as I crack the throttle the clatter goes away.
    Good to know. thanx!
     
    550FAN, Jul 28, 2009
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