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F-head Timing Marks?

Discussion in 'Early CJ5 and CJ6 Tech' started by 53Flattie, Jul 19, 2012.

  1. Jul 19, 2012
    53Flattie

    53Flattie Intigator

    Easley, SC
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    I think I might be missing part of my timing marks or something? Does this look right?

    [​IMG]

    [​IMG]
     
    53Flattie, Jul 19, 2012
    #1
  2. Jul 19, 2012
    Jw60

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    that is correct the left face is 5 advance and the right face of the tab is TDC when aligned with the V notched in the pully
     
    Jw60, Jul 19, 2012
    #2
  3. Jul 20, 2012
    53Flattie

    53Flattie Intigator

    Easley, SC
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    Okay - how do I know where 5* BTDC is? Do I just estimate based on the width of the timing pointer?
     
    53Flattie, Jul 20, 2012
    #3
  4. Jul 20, 2012
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    "...the left face is 5 advance and the right face of the tab is TDC when aligned with the V notched in the pully"

    "BTDC" is the same as "advanced."
     
    PeteL, Jul 20, 2012
    #4
  5. Jul 20, 2012
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
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    Feel lucky you even have the pointer Timmy. Also on the dist there are 2 adjustments....one where it goes to the block and one directly under the dist itself......
     
    Last edited: Jul 20, 2012
    blevisay, Jul 20, 2012
    #5
  6. Jul 20, 2012
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

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    May be helpful to mention to check the lobes that open the points as well.....DAHIK
     
    blevisay, Jul 20, 2012
    #6
  7. Jul 20, 2012
    53Flattie

    53Flattie Intigator

    Easley, SC
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    I'm ashamed I didn't know that... I thought "advanced" would be the opposite of "behind" top dead center. Learn something new every day.

    Okay - from what I saw last night, it's pretty close to 5* BTDC, just a little past it - maybe at 8 or 10. I did see the upper and lower adjustment points on the dizzy. Is one better/easier to use? Is one for fine tuning and the other for bigger changes? I'm anticipating which one to start with...
     
    53Flattie, Jul 20, 2012
    #7
  8. Jul 20, 2012
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
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    Yes for fine tuning, you will know when you are getting close to 5* when you start to hear the F head "stumble" disappear.
     
    blevisay, Jul 20, 2012
    #8
  9. Jul 20, 2012
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
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    you did check the valves first.......
     
    blevisay, Jul 20, 2012
    #9
  10. Jul 20, 2012
    53Flattie

    53Flattie Intigator

    Easley, SC
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    Which adjustment for fine tuning - the upper or lower?

    Re: valves - remember, I'm just doing the "easy" stuff to improve performance. Valves are a can of worms that I don't want to open. Honestly, it runs pretty good right now. I drove it for about 20 minutes yesterday and I *could* sell it just like it is now (other than moving the fuel pump - it vapor locked twice). I just wanted to see if timing and carb adjustment would be easy improvements.
     
    53Flattie, Jul 20, 2012
    #10
  11. Jul 20, 2012
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    " I thought "advanced" would be the opposite of "behind" top dead center. "

    bdtc = "Before" Top Dead Center.
     
    PeteL, Jul 20, 2012
    #11
  12. Jul 20, 2012
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
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    Not so much for performance Timmy but to make it run right, all the timing adjustments and carb adjustments in the world wont make much a difference if the valves are not set right. Most times with the F head they are set too tight.
     
    blevisay, Jul 20, 2012
    #12
  13. Jul 20, 2012
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
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    So that is what the timing marker looks like!
    Mine was totally gone!
    I made a new one from a coat-hanger with the tip of the stinger placed at the notch in the pulley when the engine was off and in the just opening the points position. (Done when it still had points. Now running a Pertronix unit in there)
     
    1960willyscj5, Jul 20, 2012
    #13
  14. Jul 20, 2012
    53Flattie

    53Flattie Intigator

    Easley, SC
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    Got the timing set at 5* BTDC. Smoothed it out a good bit. It was initially set around 10* after TDC.

    I had hoped this would allow me to run the fuel/air mix screw out a little more on the carb, but no dice. It still has to be all the way in to keep it from spitting fuel out the tail pipe.
     
    53Flattie, Jul 20, 2012
    #14
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