Coil wire install

SeaRayboater95

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Apr 8, 2026
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Hey Guys and Gals, quick question. I am working on a 2012 Larsen with a 4.3 Mercruiser. Changing wires and plugs and the coil wire was glued in. Had to rip it out and left a bunch of that material in the coil. Was going to clean it out and the book says to apply some insulating material in there. Is this necessary, and if so what do i use.

Thanks,

Ken
 

nola mike

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Apr 22, 2009
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Hey Guys and Gals, quick question. I am working on a 2012 Larsen with a 4.3 Mercruiser. Changing wires and plugs and the coil wire was glued in. Had to rip it out and left a bunch of that material in the coil. Was going to clean it out and the book says to apply some insulating material in there. Is this necessary, and if so what do i use.

Thanks,

Ken
I would normally go with Dielectric grease in this case, but not sure what the manual specifies
 

SeaRayboater95

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Apr 8, 2026
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Mercruiser #18 Service Manual.

I usually use Dielectric grease as well. When I removed this wire from the coil, it was glued in there pretty good. I've never seen that before. figure that was still factory installation.

Thanks,

Ken
 

Fun Times

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Mercury-Mercruiser insulating compound (notably OEM part 92-416691) is a specialized, grease-like silicone dielectric compound designed to seal, waterproof, and insulate electrical connections. It protects spark plug connections, electrical terminals, and ignition systems from moisture and corrosion, ensuring reliable engine operation
 
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