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Please explain...

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Liberator, Dec 27, 2001.

  1. Liberator

    Liberator 1/2 ton status

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    Can someone please explain what Zero Lash means! I'm trying to adjust my valves and the book says to adjust the rocker to zero valve lash + 1/2 a turn. It doesn't explain what zero lash is. How do I know when I'm at zero lash. I also remember a post about valve adjustment in which zero lash was spoken of but not explained. What is it? Thanks for any help!

    Bo

    If it breaks, it wasn't good enough!
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  2. 95 Silverado

    95 Silverado 1/2 ton status

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    when adjusting the nut on the rocker arm, feel the pressure on the push rod, as you tighten it down, zero lash is the point where the rocker arm just starts to tighten down on the push rod, the lifter is spring loaded, if it starts to collapse the lifter you are going too far, once you reach the point of zero lash you go the additional 1/2 turn on the nut

    '95 Chevy Silverado 1500
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  3. Liberator

    Liberator 1/2 ton status

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    Thank you! If I had started my engine and tried to break in my cam, I would've been in a world of hurt!

    Bo

    If it breaks, it wasn't good enough!
    http://coloradok5.com/gallery/liberator
     
  4. 95 Silverado

    95 Silverado 1/2 ton status

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    I usually hold the pushrod between two fingers and spin it while adjusting the nut, you will feel when it starts to tighten up, if in question loose is better than too tight. I readjust them after running the engine an hour or two, you can get a more accurate adjustment with the engine running.

    '95 Chevy Silverado 1500
    5.7 V8-NV4500- 3.73 rears
    See My Toys: <a target="_blank" href=http://community.webshots.com/user/wdb172454>http://community.webshots.com/user/wdb172454</a>
     
  5. HarryH3

    HarryH3 1 ton status Author

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    Note that the lifter for the valve being adjusted needs to be on the base circle of the cam while you're adjusting it. If it's on part of the raised lobe, then the pushrod will be loose again when the engine rotates.

    <font color=black>HarryH3 - '75 K5</font color=black>
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  6. arq

    arq 1/2 ton status

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    when you finger tightn it make sure the lifter is at its lowest point.

    ARQ.

    offroad baja!!!
    72 4x4 CST Blazer
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  7. Liberator

    Liberator 1/2 ton status

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    Got it! Thanks to all of you I now have the confidence I need to tackle the next phase, CAM BREAK-IN!!![​IMG]

    I'm learning as I go!

    Thanks,
    Bo


    If it breaks, it wasn't good enough!
    http://coloradok5.com/gallery/liberator
     

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