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Valve Adjustments

Discussion in 'The Garage' started by 2High4U, Jan 17, 2006.

  1. 2High4U

    2High4U 1/2 ton status

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    I left my book at home and im at my shop. could someone post up the procedure for adjusting valves\rockers for me that would be awsome thanks.
     
  2. 1977k5

    1977k5 3/4 ton status Vendor

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    Try googling for the info. Or you can take the motor to TDC, adjust both #1 cylinder valves, turn the crank 1/4 turn, adjust the valves on #8, and so on through the firing order (this technique is a little slower: it only needs to be used on cams with lots of overlap but is technically a better way to do it).
     
  3. gmtech954

    gmtech954 Registered Member

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    if you do it the above way verify each cyl. is on its comp stroke and not exhaust. then tighten until there is no up and down movement in the pushrod and then tighten an additional 3/4 turn.
     
  4. 1977k5

    1977k5 3/4 ton status Vendor

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    That would imply TDC :D (though I guess some people might screw that up).
     
  5. gmtech954

    gmtech954 Registered Member

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    no it would not imply tdc remember the exhaust stroke has piston at tdc too and the exhaust valve is open.:wink1:
     
  6. RustBuket

    RustBuket 1/2 ton status

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    Ooooooo, I sense hostility.... lol jj. But He is right.
     
  7. DEMON44

    DEMON44 Low-Tech Redneck

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    Fur sure. A 4 stroke engine has 2 TDC's for every piston per every cycle. Verify TDC compression stroke.
     
  8. 1977k5

    1977k5 3/4 ton status Vendor

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    AFAIK TDC is defined as where the piston is at the top of its stroke on the compression cycle. I realize it is at the top of its stroke twice, but when it is at the top of its stroke during the exhaust cycle it is not at TDC.
     
  9. gmtech954

    gmtech954 Registered Member

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    how do you figure its not at tdc on the exhaust stroke last i checked the rod doesnt shrink on the exhaust stroke. im not trying to be hostile so please dont take it as such.
     
  10. theperfectgarage

    theperfectgarage 1/2 ton status

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    Because the real TDC is on the fireing or power stroke. Allow me to edit myself, More correctly, the compression stroke.
     
    Last edited: Jan 18, 2006
  11. gmtech954

    gmtech954 Registered Member

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    hate to tell you but your wrong. top dead center is exactly what it says which means that the piston is as high in the bore as it can get, not that its at this position and on the comp stroke. like i said the rod length doesnt shrink and i dont think the cranks stroke does either.
     
  12. theperfectgarage

    theperfectgarage 1/2 ton status

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    Agree compleatly with your physical logic, but without recognizing the " one " tdc how would we set our cam phasing and valve timing?
     
  13. big dan

    big dan 1/2 ton status Premium Member

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    does the engine run? me and my dad always set the valves with the motor running. you just tighten them down until they quit rattling, then loosen them till they rattle again and tighten them back down till they quit and go another 1/2-3/4 turn.
     
  14. theperfectgarage

    theperfectgarage 1/2 ton status

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    Way to ruin our fun, we could debate all day.:D
     
  15. big dan

    big dan 1/2 ton status Premium Member

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    sorry:o didnt mean too
     
  16. gmtech954

    gmtech954 Registered Member

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    yeah that debate could have went on for days:wink1: but im still right...........lol:wink1:
     
  17. theperfectgarage

    theperfectgarage 1/2 ton status

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  18. DEMON44

    DEMON44 Low-Tech Redneck

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    ........I see the great debate subsides.


    I understand the implication of TDC when refering to a valve setting function. But I'm sure it was clairified because someone that might not know anybetter would see the piston at top dead center and think it's all good. While it's really 360* out. :waytogo:
     

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