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Distributor Question

Discussion in 'Early CJ5 and CJ6 Tech' started by dohc281, Apr 1, 2005.

  1. Apr 1, 2005
    dohc281

    dohc281 It is what it is.

    Laurel Springs, N.J.
    Joined:
    Dec 30, 2004
    Messages:
    605
    I'm still having problems with the engine backfiring thru the carb. I did notice that the rotor can be moved about 1/4 inch in either direction. Is this normal or is something worn?
     
    dohc281, Apr 1, 2005
    #1
  2. Apr 1, 2005
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
    Joined:
    Dec 17, 2002
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    2,362
    There is some movement with the fly weight expanding. If you take off the rotor you will see it.
     
    scott milliner, Apr 1, 2005
    #2
  3. Apr 1, 2005
    kelly

    kelly New Member

    Joined:
    Mar 27, 2005
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    38
    What engine do you have? Is the backfire on acceleration, when parked or when driving?
     
    kelly, Apr 1, 2005
    #3
  4. Apr 1, 2005
    nyejos11

    nyejos11 Member

    Emmaus, PA
    Joined:
    Dec 17, 2003
    Messages:
    384
    My motor was doing the same thing. Check your timing. If that is OK then check to see if your timing chain is worn. My timing chain and gears were severely worn. Disconnect your battery, remove your distributer cap(leave the wires on it so they don't get mixed up), then turn the crankshaft pulley and see how much movement it takes to move the rotor. If its not almost instant it is probably worn.
     
    nyejos11, Apr 1, 2005
    #4
  5. Apr 2, 2005
    dohc281

    dohc281 It is what it is.

    Laurel Springs, N.J.
    Joined:
    Dec 30, 2004
    Messages:
    605
    I have a 4 cylinder. The backfire is thru the carb as I give the engine gas. There is an initial hestitation then it backfires. Last weekend I set the timing with a timing light and it was off and I set it on the proper mark. This made a great improvement but not close to acceptable. I've put in new plugs, rotor and points. The cap is fine.

    I'll check the amount of play in the chain next. Thanks.
     
    dohc281, Apr 2, 2005
    #5
  6. Apr 2, 2005
    dohc281

    dohc281 It is what it is.

    Laurel Springs, N.J.
    Joined:
    Dec 30, 2004
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    605
    Is this normal or is something worn?
     
    dohc281, Apr 2, 2005
    #6
  7. Apr 2, 2005
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    Nov 6, 2002
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    4,275
    If you have an F-head 4-cylinder, there is no timing chain, only gears. Are you sure you have the firing order correct, and have the plug wires in the correct positions on the cap? If they are all in the correct sequence, it is possible to have them one spot off on the cap, so that the distributor will *almost* time correctly, but you run out of housing rotation before you get there. HTH ;)
     
    w3srl, Apr 2, 2005
    #7
  8. Apr 2, 2005
    dohc281

    dohc281 It is what it is.

    Laurel Springs, N.J.
    Joined:
    Dec 30, 2004
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    605
    I checked the position of the wires on the cap with my manuel and they appear to be correct.
     
    dohc281, Apr 2, 2005
    #8
  9. Apr 2, 2005
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    Nov 6, 2002
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    Ok, now go back and check the position of the oil pump drive when the engine is at TDC, per the FSM. It is entirely possible to have the distributor at the 'correct' position, but to have the oil pump drive gear be off by a tooth or more. Everything HAS to be correct with relation to TDC.
     
    w3srl, Apr 2, 2005
    #9
  10. Apr 2, 2005
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
    Joined:
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    With the rotor off check for movement of the shaft. There should not be any movement of the shaft.
     
    scott milliner, Apr 2, 2005
    #10
  11. Apr 2, 2005
    michigan_pinstripes

    michigan_pinstripes I'm not lost, I'm wandering

    Clarkston MI...
    Joined:
    Aug 20, 2003
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    605
    Something to consider...

    My L-134 runs the best at a wacky 17* :? . It actually isn't --here is why. If anyone has messed with the oil pump in the past, it may have been reassembled incorrectly thus out of sync. Not a biggie but you have to adjust accordingly like I do. Treat it as if somebody moved your timing indicator :rofl: Watch your vacuum reading when timing.
     
    michigan_pinstripes, Apr 2, 2005
    #11
  12. Apr 3, 2005
    dohc281

    dohc281 It is what it is.

    Laurel Springs, N.J.
    Joined:
    Dec 30, 2004
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    605
    I was under the impression that on the F head the distributor had only one way to go in.
     
    dohc281, Apr 3, 2005
    #12
  13. Apr 3, 2005
    michigan_pinstripes

    michigan_pinstripes I'm not lost, I'm wandering

    Clarkston MI...
    Joined:
    Aug 20, 2003
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    605
    True, but IIRC, your #1 should be pointing at 5 O'clock position. Due to my oil pump being off a tooth or so, my #1 is in a different time zone :rofl:
     
    michigan_pinstripes, Apr 3, 2005
    #13
  14. Apr 3, 2005
    jeepdaddy2000

    jeepdaddy2000 Active Member

    Eagle Point oregon
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    Jun 24, 2004
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    1,187
    Might want to check the accelerator pump. Backfiring and hesetation on acceleration are two symptoms of a lean mix.
     
    jeepdaddy2000, Apr 3, 2005
    #14
  15. Apr 3, 2005
    dohc281

    dohc281 It is what it is.

    Laurel Springs, N.J.
    Joined:
    Dec 30, 2004
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    I've got so many things to look at for this problem. I've been thinking that and need to make sure its
    ok.
    Thanks to all for your replies.
     
    dohc281, Apr 3, 2005
    #15
  16. Apr 3, 2005
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    Look at the procedure in the FSM for installing the oil pump and it will all suddenly become much, much clearer. Just keep eliminating possibilities and you'll get it. Hang in there! ;)
     
    w3srl, Apr 3, 2005
    #16
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