Re: OK BOYZ! 4-H tractor project ??'S

Posted by captaink on May 06, 2005 at 12:13:20 from (66.115.214.56):

In Reply to: OK BOYZ! 4-H tractor project ??'S posted by Farmallkid From Ont, on May 06, 2005 at 11:49:35:

For ignition timing on a gasoline engine the basics are the same pretty much regardless of the engine. First you should have a shop manual that gives you the rotation of the distributor (clockwise on your H) the firing order (1-3-4-2 on your H), the location of the number 1 cylinder (nearest the radiator on your H) (some V-8 manufacturers number them differently), and the position of the number 1 tower on the distributor cap (there should be a number 1 under the top right tower on the distributor cap on your H). Next find the timing mark for the crankshaft position which will tell you when the #1 piston is at top dead center (TDC) on either the compression or exhaust cycle. On your H it will be a notch in the crankshaft pulley, but make sure (owners manual comes in handy here) you have the correct mark, as I believe there are two, one for TDC the other being the locator for the grease fitting in the flywheel for the clutch pilot bearing. On some engines the crankshaft position mark may be on the flywheel.

Once you have this information take out the spark plugs and place your thumb in the #1 spark plug hole. Have someone turn the engine over with the hand crank until you feel pressure trying to push your thumb off the spark plug hole. When you feel the pressure, continue cranking until the marks you found earlier on the crankshaft line up with the pointer. #1 piston is now in firing position (or close enough to get running anyway). Install the distributor so that the rotor under the cap is pointing towards the #1 tower on the cap. Next to get it real close, take an ohm meter and connect it to the terminal on the side of the distributor and a ground. Loosen the clamp that holds the distributor from rotating and rotate the distributor until the ohm meter shows some resistance (or the points have just opened). Tighten the clamp and your engine is now “static” timed. Install the spark plugs. To finish you need the specs and a timing light to really polish up the timing, again you hook the timing light up to the #1 spark plug per the lights instructions, and start the engine. There should be a mark on the pulley that indicates the correct timing, just loosen the distributor and rotate it until the timing light indicates that the plug is firing on the correct mark. Tighten the distributor and you are done unless you want to check the spark advance, which I’m not going into on this post as it is long enough.

If you have questions, send and e-mail to me.

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