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Seca 750 valve cover torque

Discussion in 'XJ Technical Chat' started by Plug, Mar 24, 2018.

  1. Plug

    Plug Active Member

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    After putting in 6 helicoils to fix my goof ups from last time I checked the valve clearance.....can some one please give me the correct torque spec for the 12 valve cover bolts? Is 7.2 lbs correct??
     
    Last edited: Mar 24, 2018
    Plug, Mar 24, 2018
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  2. Jetfixer

    Jetfixer Well-Known Member

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    Inch pounds is more like it.
     
    Jetfixer, Mar 24, 2018
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  3. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    7.2 inch pounds. The bolts are shouldered, so all you really need to do is tighten them until they snug up. Medium strength Lockite will keep them from backing out. Go much beyond 7.2 in pounds/ snug, and you'll crack the casting (as you found out).
     
    Last edited: Mar 24, 2018
    k-moe, Mar 24, 2018
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  4. Plug

    Plug Active Member

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    Hand tightened only then....Will keep an eye on it and see if I develop any leaks. THANKS!!!!

    Feels good having those repaired....been at the back of my mind since it happened over the fall
     
    Plug, Mar 24, 2018
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  5. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Umm, not so sure about that. Yamaha lists the torque spec as 10 Nm / 1.0 m-kg / 7.2 ft-lbs.
     
    chacal, Mar 25, 2018
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  6. cgutz

    cgutz Well-Known Member

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    I use a simple allen wrench and finger tighten. I check them after a hundred miles and am then good to go until next time I check valve clearances.

    I think it more important that the rubber grommets on the valve bolts are still pliable as they are what press the valve cover in place.
     
    cgutz, Mar 25, 2018
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  7. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Yes!
     
    chacal, Mar 25, 2018
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  8. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Yep.
    Please ignore my brain-fart. Maybe I need to put the service manual back onto my reading desk.
     
    k-moe, Mar 25, 2018
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  9. wgul

    wgul Active Member

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    More often they’ll strip before a cracked casing happens
     
    wgul, Mar 25, 2018
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  10. Plug

    Plug Active Member

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    Hand tightened with a palm wrench......after 50 miles today, no leaks.....Will just go with the wrist click method from now on.
     
    Plug, Mar 25, 2018
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  11. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    True, yet we know of at least three cases where either the head, or the cam-cap-that-isn't-a-cam-cap, fractured from overtightning a valve cover bolt.
     
    k-moe, Mar 25, 2018
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