Also, Slick sold an after-market kit replacing the Bendix magnetos. Slick magnetos might also be on some pre‑model M20J 360 engines as Lycoming uses them on factory overhauled and remanufactured engines. Mooneys saw the last of the Bendix magnetos as Lycoming abandoned the shower-of-sparks starting method and adopted Slick's impulse coupling magnetos on 360 type engines. The M20J used a Bendix dual magneto that does not have this problem. With the introduction of the M20J, Mooney stopped using the S20 magnetos. Most Mooneys produced in the 1960s and up to the introduction of the M20J in 1977 had these common magnetos installed on the O360 and IO360 Lycoming engines. This leads to a short or reduced spark energy at the spark plug. A sharp bend in the P-lead from the right magneto stresses the insulation, often causing cracks. This month’s ShopTalk will pinpoint a common problem of the M20 series aircraft with Bendix S20 series magnetos.
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