Posted by Brad Gyde on March 29, 2011 at 19:00:39 from (173.109.232.110):
In Reply to: ih 756 gas timing posted by aksteve on March 29, 2011 at 12:31:02:
[quote="aksteve"] I have timed per the manual but when I turn it over I can tell it is firing before the valves are closed as it is exhausing through the carb. lol I know its a timing issue but I have proved ( i think) tdc by stroking the cylinder till the piston is closing after the intake valve opens.
From this, I gather that maybe you're not on TDC.. If popping thru the carb you either have firing order off, or are off timing.
From your other responses I annot determine whether you removed your distributor or not..
What I would do is this:
1)Remove valve cover
2) Turn over engine until the intake valve closes, then using a wire or the like in the #1 plug hole, slowly turn over until the wire in plug hole seems to have found "high point" (in other words, the wire seems to drop into cylinder no matter which way you rotate the engine)
3) At this point, I would pull dist. cap, and try to take notice to where the rotor is pointing.. Should be at #1, but I would almost bet you're nearly 180 degrees out of time.
4) Remove distributor and get rotor CLOSE to #1 terminal on cap (if necessary)
5) leave distributor lamp loose, install cap/rotor, ground #1 plug, turn on ignition, and rotate dist. SLOWLY and watch for spark.
That should be "static timed" and should very well be close enough for it to run.. Provided that it is supposed to fire at TDC. I have done similar on several engines, sometimes you set the degrees differently (small block chevy comes to mind) but the process is still pretty much the same.
I'm sure I just told you what the service manual said.. But, hope this will help..
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