"Bob.... (The Coil Locatin
"Bob.... (The Coil Locating Ring) That's a special tool that would sit over the outside of the coils etc to position tham properly in relation to the flywheel magnets. Creates the space between them so that they don't hit. It's not needed if you install the coils as follows.
With the coil(s) off, notice where they would sit on the plate. At the very top of that surface, you'll see a slight bevel. The vertical outside surface of the coils must align with the top inside of that bevel. This method (An OMC Procedure) actually increases the space between the coils and the flywheel magnets by a couple thousands but that is more than acceptable.
No need to mark anything. The engine timing pertains to the crankshaft key being aligned with the flywheel slot. Unless you shear that key, the engine is in time.
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