Magneto timing light2/28/2023 ![]() Always refer to the aircraft operating manual for specific information. The magneto drop should be even for both magnetos and is generally in the area of a 25–75 rpm drop for each magneto. ![]() Note the amount of total rpm drop that occurs for each magneto position. Return the ignition switch to the both position. Place the ignition switch in the left position and again note the rpm drop. Allow the switch to remain in the both position for a few seconds so that the rpm stabilizes again. Place the ignition switch in the right position and note the rpm drop on the tachometer. After reaching the engine rpm specified for the ignition system check, allow the rpm to stabilize. The ignition system check is used to check the individual magnetos, harnesses, and spark plugs. One other check is accomplished prior to engine shutdown. With the engine set at a prescribed number of degrees ahead of true top dead center on the compression stroke and with final movement of the engine stopped in the direction of normal rotation, the magneto can be installed on the engine. Set the engine crankshaft at the prescribed number of degrees ahead of true top dead center as specified in the applicable manufacturer’s instruction, usually using the timing marks on the engine. This can be determined by holding a thumb over the spark plug hole until the compression air is felt. 1 piston is coming up on the compression stroke. Pull the propeller through in the direction of rotation until the No. Remove the most accessible spark plug from the No. The chamfered tooth should line up (reference timing mark for the magneto) in the middle of the timing window. This is done by checking and adjusting the ignition points to open at the E-gap position. The magneto must be timed by first adjusting or checking the internal timing with the magneto off the engine.
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