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Fhead Tuning Issues

Discussion in 'Flat Fender Tech' started by pfmg, May 27, 2018.

  1. Jun 23, 2018
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    Makes sense, it would be richer then.
     
  2. Jun 23, 2018
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    Can't hurt to try the Solex. If you do that look at the carb. base gasket when you remove the YF. Check it real good for fit, make sure it has the notch for the vacuum on the base of the carb on the YF.
     
  3. Jul 10, 2018
    pfmg

    pfmg Member

    Billerica Mass
    Joined:
    Feb 10, 2010
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    did some work on the 3B the last couple weeks, So during the NH run, my two biggest problems (other then fire [​IMG]), were the engine running too hot, and some carb issues that kept creeping up, mostly centered around restarting and low idle stalling. I was running the stock radiator, but with a smallish electric fan, and no shroud. I also found out i had a bad thermostat, which probably caused most of my cooling problems.

    But in all the willys runs i have gone on, i have only seen cooling problems with systems that were modified. Like different radiators, electric fans, no shrouds etc. Since i had an original shroud and fan, i figured i would put it back to stock, replace all the hoses, (don't know how old they were) and install new thermostat and see how that goes. In my limited testing, its cooling much better, and more consistent now. My carb issues, im thinking are a dirty carb, mine is a pretty fresh rebuild, but i had some line, filter and tank issues after i installed it and the carb might have got some crap in it, so i had Rick P build me a new one, along with the carb, somewhere along the line, the stock air filter was removed, and replaced with a halfassed K&N installation. Again, seeing the stock setup usually working better, i put it back on, but i did modify it to use a bigger, and better installed K&N element inside the stock housing.

    also After the run, my two small leaks were much bigger...LOL, the Tcase i have to work on still, but im thinking its the front output seal. The oil pan/timing cover was leaking too, i pulled them, flattened the flange, and put new gaskets on, leak is gone now, also was able to confirm the timing gears were correctly lined up, so it really leads me to believe my running issues are the carb.


    [​IMG]
    [​IMG]
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    [​IMG]
     
    william_cj3b likes this.
  4. Jul 11, 2018
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    I like your discussion on the cooling system. Fixing something that isn't broke doesn't always work out, which you discovered. I still prefer the original oil bath, and I'll always have the opinion it is the best setup for a Jeep, however I do like your compromise with the K & N.
     
  5. Jul 11, 2018
    scoutpilot

    scoutpilot Sponsor Sponsor

    Asheboro, NC
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    I like the vacuum gauge.
     
  6. Jul 11, 2018
    45es

    45es Sponsor Sponsor

    Naches, WA
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    While addressing your cooling issues, you may want to replace your fan belt. The belt in your photo is to narrow for use with the water pump pulley. Normal engagement between the belt and pulley is from the sides of the belt and not off the bottom of the belt. With the load the belt will see from the fan/water pump and alternator, I believe it will start slipping soon if it isn't already.
     
    Last edited: Jul 11, 2018
  7. Jul 11, 2018
    pfmg

    pfmg Member

    Billerica Mass
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    Yes, totaly agree, i have a new alternator with wide pulley going on soon with the correct belt. I will confirm, with that belt and pulley on there now, i can not get it tight enough to not slip
     
  8. Jul 11, 2018
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    Glad to hear you're getting the correct size belt. It's more better. :D
     
  9. Jul 14, 2018 at 5:30 PM
    pfmg

    pfmg Member

    Billerica Mass
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    Running much better now, not sure what was the actual problem, But for the final fixes I put on a fresh carb, and the stock air cleaner housing but with large K&N filter in it and all stock housing connections. Also put the stock fan and shroud back on in place of the electric fan. Also redid all the battery and ground cables when I wired the welder. Started it up, ran smooth, strong and is pulling a steady 19-20 on the vacuum gauge.
     
  10. Jul 14, 2018 at 5:34 PM
    pfmg

    pfmg Member

    Billerica Mass
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    Feb 10, 2010
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    It’s also cooling much better. Replaced all hoses, thermostat, flushed everything, and put shroud and stock fan back on. In the video you can actually see the power of the stock fan and shroud pulling the windshield strap in front of the grill
     
    73 cj5 likes this.
  11. Jul 15, 2018 at 11:04 PM
    Keys5a

    Keys5a Sponsor Sponsor

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    I'm a believer that a proper-fitting fan shroud makes a huge difference in cooling efficiency. Yes, the stock fan will pull a lot of air through the radiator when set up correctly. That, and the wonderful iconic sound that is the trademark of the 134's.
    -Donny
     
    PeteL likes this.
  12. Jul 16, 2018 at 7:58 AM
    PeteL

    PeteL Member Sponsor

    Hills of NH
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    Aug 3, 2003
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    (y)(y)(y)
     
  13. Jul 16, 2018 at 8:24 AM
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    Love me some of that 134 fan sound. :coffee:
     
  14. Jul 16, 2018 at 12:11 PM
    pfmg

    pfmg Member

    Billerica Mass
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    helps drowned out some other noises..:D
     
    Glenn likes this.
  15. Jul 17, 2018 at 6:04 AM
    garage gnome

    garage gnome Rust polisher Sponsor

    Western MA
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    Sounds better than my CJ5!
     

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