Antique Coil Rebuild

[NeptuneMadness]

So I have a 1941 and 1954 Neptune motors. The coils on both are very weak and just aged. I saw where you can take the winding off of the shoe, and replace it with a modern winding, (With possible trimming of the shoe) has anyone done this and had success? My 41 wants to fire! But the coil is just to weak.

[Buccaneer]

Are they Phelon coils like this 1954 Neptune AA1.
Guessing an OMC coil could be retrofitted, but
may need considerable machining to make the OMC
coil fit on the larger laminates.

I’d want to convince myself that the coils are actually bad first.
Have you done or had any testing done on the coils?

Have you replaced the condenser and dressed the points
after taking them apart?

Prepare to be boarded!

[The Boat House]

https://youtu.be/tVvSB5QxMrw

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NeptuneMadness

[NeptuneMadness]

Thanks Boat House! Thats the video I have been looking for! I saw it done once before, but haven’t been able to find the video again.

[NeptuneMadness]

Thats the exact set up I have. I haven’t gotten to testing yet, but visually the coil is disintegrating. But on my 41″ The coil is super weak and I have replaced the condenser and cleaned the points. On my 41′ I will have to trim just a hair off the laminate, for a new coil to fit. Problem is, with the 54′ the laminate is smaller than the coil. (Coils are off of a 1966 Evinrude) just wondered if anyone has done the coil swap and if they have had any luck.

Thanks for the suggestions!

[The Boat House]

When the hole in the coil was too big (once) I
made shims from empty oil bottles. Gallon
bottles are usually thicker than quarts. When
I got the right combination I epoxied it all
together.
Tubs

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NeptuneMadness

[NeptuneMadness]

I wondered about that.. Just filling the gap with a piece of steel or similar. But doing so the whole set up and swapping of the Coil it’s self, everything worked out without issues?

[dave-bernard]

I had a coil laying around with no laminents so i used a screw driver to test and it worked on my merc-o-tronic..

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NeptuneMadness

[The Boat House]

I made up a coil using 7/16 bar stock for a
battery ignition. While it would produce a
spark it was obviously weak. This has lead
me to believe that stacking more plates on
top would be OK but placing them along
side might possibly effect the spark. Only
an opinion. I didn’t have a coil tester at that
time to compare the output. Using plastic
for shims is only slightly increasing the
thickness of the coil covering and the plastic
is also much easier to fabricate into shims.
Tubs

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NeptuneMadness

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