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F134 Setting Timing

Discussion in 'Early CJ-5 and CJ-6 Tech' started by 65seejayfive, Jun 9, 2019.

  1. Jun 9, 2019
    65seejayfive

    65seejayfive Blazin’ new trails

    York, PA
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    I've searched on here and have found a few good threads but how can I set my timing on my F-head when my crank pulley does NOT have any marks for TDC? Any advice/tricks are appreciated. Is my best bet to pull #1 plug and turn over until I feel compression or do you have another way to do it? Thanks!
     
  2. Jun 9, 2019
    62CheepJeep

    62CheepJeep Member

    Spartanburg SC
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    there should be a small chink on the edge of the back pulley, I put a little white paint on mine yesterday when I check/set the timing on mine. I have the double pulley on mine.
     
    Lockman likes this.
  3. Jun 9, 2019
    65seejayfive

    65seejayfive Blazin’ new trails

    York, PA
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    I looked and looked for a long time and I can’t find a single mark on either pulley. I’ll go and look again. I can see the marks on my timing cover but I can’t find a thing on my pulleys. They don’t appear to be original.
     
  4. Jun 9, 2019
    Alan28

    Alan28 Well-Known Member Sponsor 2019 Sponsor

    Châtillon en...
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    Well, I have a F 134 and it is a perfect engine. I have forget the tricks to get the good solution, taking off a spart to get the top cylinder, use a light to have the ignition contact... checking carburetor, etc... but this engine is easy to get in good order so I am sure that you will do the right thing.
     
  5. Jun 9, 2019
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    As stated there should be a notch on the back side of the pulley. The edge closest to the block.
     
  6. Jun 9, 2019
    65seejayfive

    65seejayfive Blazin’ new trails

    York, PA
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    I just crawled out from under the Jeep to make sure I wasn’t missing it but neither one of my pulleys, front or back (closest to the block) have a notch, hole, mark, nuttin. I have a FSM so I know what I should be looking for but....What’s my best plan to find TDC so I can mark my pulley and time this thing correctly?
     
  7. Jun 9, 2019
    73 cj5

    73 cj5 Heavy Metal Sponsor

    MS
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    If you can put your finger over #1 and spin it over until it blows your finger off and then go back a hair it'll get you in the ballpark but taking off the valve cover will be more useful so you can see where the valve is at. Might even help to take off the distributor cap for reference if you're unsure.
     
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  8. Jun 9, 2019
    65seejayfive

    65seejayfive Blazin’ new trails

    York, PA
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    I just read an interesting suggestion on another site. Would I be able to pull #1 plug and stick a piece of copper wire down in the hole until I feel the piston and crank (by hand) until the wire stops moving up? Obviously it should be something long that does NOT fall down the hole! Would I even be able to feel the piston or is it too far offset?
     
  9. Jun 9, 2019
    73 cj5

    73 cj5 Heavy Metal Sponsor

    MS
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    Easier to pull off the valve cover. You could be tdc on exhaust stroke and that’s not where you want to be.
     
  10. Jun 9, 2019
    65seejayfive

    65seejayfive Blazin’ new trails

    York, PA
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    So if I pull off valve cover and turn the motor over until the #4 intake valve is at its highest/open point (highest part of cam), that means that #1 is closed the whole way (lowest part of the cam). Am I thinking this correctly or do you have another suggestion? I just adjusted my valves so clearances should be about right. I can go until I can fit my .018 feeler gauge in #4?? I don’t really want to open the side cover again if I don’t have to. If I’m going the complete wrong direction set me straight :beer:

    Edit: I believe I said this backwards. If I get .018 on #4 then technically that’s closed the whole way and #1 is open, I think I need to just watch #1 and check clearance there, meaning it’s closed the whole way???
     
    Last edited: Jun 9, 2019
  11. Jun 9, 2019
    73 cj5

    73 cj5 Heavy Metal Sponsor

    MS
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    #1 intake will be on base circle of the cam so yep that’s right. You adjusted the valves while they’re closed right?
     
  12. Jun 9, 2019
    65seejayfive

    65seejayfive Blazin’ new trails

    York, PA
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    I followed the video on YouTube by Hannibal
    with the opposing valve method. Basically with both top and side covers opened up to see the valves, when #4 was open the whole way, #1 would then be closed, so I’d adjust clearance on #1. Same with #3 and #2, back and forth, exhaust and intake.
     
    Last edited: Jun 9, 2019
  13. Jun 9, 2019
    65seejayfive

    65seejayfive Blazin’ new trails

    York, PA
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    Guy I work with has a borescope, I may try sticking that down in there and taking a look, making sure not to smash it with anything :rolleyes:. I know that it won’t be 100% “accurate” due to dwell and such but it’s better than what I have now, which is nothing. Anyone done this before?
     
  14. Jun 9, 2019
    PeteL

    PeteL Member Sponsor 2019 Sponsor

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    They used to make tools to do this exact thing. Just be sure you are on the compression stroke. Finger over the plug hole works.

    Looking at the valves would tell you what stoke you are on but I can't understand how it would be precise for TDC.
     
  15. Jun 9, 2019
    65seejayfive

    65seejayfive Blazin’ new trails

    York, PA
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    So if I’d put my finger over the #1 plug hole, the only time I’d feel pressure pushing my finger off would be on compression correct? I could do this to know I’m on compression stroke then put a borescope or copper wire in there and watch or feel the piston come up to TDC. Am I thinking of this correctly?
     
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  16. Jun 9, 2019
    PeteL

    PeteL Member Sponsor 2019 Sponsor

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    What I would do. Even just a flashlight and a friend to rock the engine rotation by hand.
     
  17. Jun 9, 2019
    53A1

    53A1 Member

    Kern Co. Ca.
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    Yep. Better yet, if you have a harbor freight dial indicator with mag base, connect wire to that. Not sure if this will work through plug hole but I've found tdc on bikes with the head off.

    If you mess around with the copper wire make a loop on the end bigger than the spark plug hole.
     
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  18. Jun 9, 2019
    65seejayfive

    65seejayfive Blazin’ new trails

    York, PA
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    Thanks fellas (y)
     
  19. Jun 9, 2019
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    If you take #1 plug out you can see everything good enough to find TDC. Obviously if you take the other 3 plugs out it will be easier to turn the engine by hand.
     
    Lockman likes this.
  20. Jun 10, 2019
    70cj5134f

    70cj5134f Member

    East Tn
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    I bought a cheep pulley with no marks. They are out their. I matched keyways and cut a mark on mine before install. I've used a wood pencil before to find tdc .
    Ps mine runs better with timing advanced.
     

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