5/27/2023 0 Comments Magneto timing lightWith a dual mag there is a spec of a couple of degrees for the points to open relative to each other. When the mag is installed it can then be turned slightly so that the points open at the desired crank angle, as shown with a timing light connected to the p-lead. Install the mag when it is in this position and the #1 cyl is at the desired timing location (e.g., 25 degrees BTDC on the compression stroke). When that red tooth is visible the rotor is pointing at the #1 lead. On most Bendix mags there's a plug you can remove to see the plastic drive gear, and there's a red tooth on the gear. But there is some play in the magneto position relative to K when back-rotated to magnetic neutral, and some play in how the mag drive gear meshes with the crank idler, so it seems that some fine-tuning is required. How do I precisely adjust timing? I'm not sure how rotating the magneto a few degrees to fine-tune will work with the impulse coupling there. It's a Bendix 10-682555-11 (D4LN-3000) with a 25-degree impulse coupling.ġ) Set crank to 25 deg prior to TDC for C1Ģ) Set magneto to K minus a bit to magnetic neutralģ) Attach mag to accessory port and finger-tighten clampsĤ) Attach timing lights to P-terms (I have adapters)ĥ) Rotate prop slowly through a few cycles to ensure impulse coupling is engagedĦ) Expect points to open at TDC for C1, not 25 deg prior? I have been authorized by my IA to perform the replacement of long overdue vacuum pump and OH'd dual magneto after which he will inspect and so forth.Īt this point, I have the pump and the mag installed after a few hours of figuring out how not to do things in the wrong order (put the fittings on the vacuum pump before you install it, and so forth), but I am not certain of the timing procedure for the dual magneto. It's annual time and I have the chance to participate in the work this year.
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