Non starting problem

Hudsonrules
Hudsonrules Senior Contributor
edited November -1 in HUDSON
I need some help or advice please. My son and I did a valve job on my '49 super "6" and I finally have it back together and it will asound like it wants to start but will pop or back fire which I am sure is timing. I have spark and the timing marks line up. Now if the valves are not adjusted riight on will that cause the problem/ and what should the gap be when cold? thanks for any help.

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  • rambos_ride
    rambos_ride Senior Contributor
    Hudsonrules wrote:
    I need some help or advice please. My son and I did a valve job on my '49 super "6" and I finally have it back together and it will asound like it wants to start but will pop or back fire which I am sure is timing. I have spark and the timing marks line up. Now if the valves are not adjusted riight on will that cause the problem/ and what should the gap be when cold? thanks for any help.

    1st thing I would double check is the distributor plug wiring and firing order - it's very easy to get the sequences 1 hole off depending on where you start with TDC location on the distributor cap.

    Generally for any engine...If the ignition timing is retarded (BTDC) when you get #1 cylinder to TDC and check the distributor rotor alignment #1 would be the terminal the rotor just passed in the rotation because the cylinder would have fired Before it reached TDC. If the timing is (ATDC) #1 would be the next one inline of the distributor rotation.

    If this all checks ok then proceed to re-check initial timing, then probably a quick check of the valvle adjustment might be needed if it still doesn't start.
  • Unknown
    Unknown
    Hudsonrules wrote:
    I need some help or advice please. My son and I did a valve job on my '49 super "6" and I finally have it back together and it will asound like it wants to start but will pop or back fire which I am sure is timing. I have spark and the timing marks line up. Now if the valves are not adjusted riight on will that cause the problem/ and what should the gap be when cold? thanks for any help.
    Yes tight valves will cause this problem. I dont know how you adjusted them but the valves on each cylinder has to be adjusted on firing stroke.
    I dont know a cold setting but hot is 8 intake & 12 Exaust so set them a little wide say 10 & 14 and reset them when the engine is hot.
  • dwardo99
    dwardo99 Expert Adviser
    Did you have some reason to remove the timing chain? If so, better recheck the valve timing.
  • Park_W
    Park_W Senior Contributor
    When you time it "manually," be sure you have it at TDC on the compression stroke, not the exhaust stroke. Put your finger in the spark plug hole and confirm that you're building pressure as it approaches the TDC mark on the flywheel. Or just put it at TDC and use a piece of heater hose to blow in the plug hole ... if it's on the compression stroke you'll feel resistance. If you don't feel resistance to blowing, it's on the exhaust stroke.
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