To be sure you are using the right value, check the engine data plate found on the lower, right side of the engine sump. Timing does not advance itself over time in a good-running engine, but if the last person who adjusted your timing did it wrong you could end up with more advance than you want.
Using these marks may not be an option, depending on your baffle arrangement. A pointer made from ½-inch aluminum angle (right) points to the timing marks on the back side of the starter ring gear. Look for it on the sump on the right side of the engine. The engine data plate (left) will tell you the recommended timing for your Lycoming engine. This is something that could be a problem for people running auto gas in engines that require higher octane fuel, but if you stick to avgas, you should not have fuel-related detonation problems. It can also be caused by using gasoline with a low octane rating. The most common cause of detonation is timing that is too far advanced. In extreme cases, detonation can cause major internal damage to your engine-the kind of damage that can knock you out of the sky. If your timing is too far advanced your engine could be exposed to destructive detonation. Or maybe your cylinder head temperatures (CHTs) are a little on the high side. If your plane seems a bit down on power or your mag tests start giving you drops of more than 120 rpm, it may be time to check your magneto timing. As an option a small pin can be inserted in the hole to make it easier to line up with the marks.Ĭhecking your magneto timing is part of every yearly condition inspection, but beyond that it is something you should be able to do whenever you suspect that your magnetos’ performance is not up to snuff. Line these marks up with the 1/16-inch hole in the starter housing (see arrow). One set of timing marks is on the front side of the starter ring gear.
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