Thread: Timing Problem?
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Old 10-29-2004, 09:12 AM
Don Moyer's Avatar
Don Moyer Don Moyer is offline
 
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Stormy,

Before going to the trouble of rolling your engine out of the engine room, I would check one more time to be sure you have the ignition timing set at top dead center (TDC) of the number one cylinder (at the flywheel end of the engine). It's very easy to overshoot and end up at the bottom of the stroke instead of at the top (having done this myself on quite a few occasions).

The TDC position of the No. 1 cylinder is most easily found by holding a finger over the spark plug hole in the first cylinder, while manually turning the flywheel counterclockwise. As soon as compression is felt, stop turning and look at the position of the roll pin in front of the crankshaft. Continue turning until the roll pin is perfectly vertical. The piston will then be at TDC.

It's very easy to overshoot the TDC position while trying to be certain of a positive indication of compression. In this case, the engine will be rotated a full 1/2 revolution before the roll pin lines up vertically again, and the piston will be at the bottom-most point in its travel (instead of TDC).

Regards,

Don
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