QD15 coil – can I use this one?
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Long story short. Just purchased this motor, compression at 92 to 95. Spark gap checker showed #1 excellent spark, #2 not quite as good, but still strong. Popped the flywheel and started looking at the points. To my surprise I find that #1 coil has a chaffed wire! Brand new chaffing! It HAD to have happened while I was checking compression, etc because I found the plastic dust right on top. I verified by putting the flywheel back on and viewing thru the inspection hole. That’s when I noticed #2 was about to have a problem as well…
The meter shows the coil to be good, but my question is can I go ahead and repair this and use it? I would shrink tube it…
It appears these coils might have been brand new (at one time), and further inspection shows the other coil was about to have the same issue. Whoever installed them did not realize that the wire needs to be pulled tight to avoid rubbing against the flywheel. I checked the flywheel and it is the correct part #.
Another question is, do we think these are the correct coils? If the numbers on them are part #s then they don’t correspond to what is supposed to be there, correct?
Might take a couple of posts to include all the pics.
I’m not sure I would have thought to pull that wire tight. What do you guys think?
Please let me know your thoughts?
Use it?
Correct part #s?
John Gragg
RIverside, CAJust starting in the hobby, please be patient.
49 Sea King 5hp GG9014A
49 Johnson TD20
48 Johnson TD20
54 Johnson QD15
55 Johnson CD12More pics
John Gragg
RIverside, CAJust starting in the hobby, please be patient.
49 Sea King 5hp GG9014A
49 Johnson TD20
48 Johnson TD20
54 Johnson QD15
55 Johnson CD121 user thanked author for this post.
Those are the correct coils, just with an older part number. The chafed wire on the one coil looks like it got chewed up some time ago, so I don’t know that you did all the damage to it. If that were my motor, I would not trust a patch job on the wire and a piece of heat shrink tubing is not going to replace the individual strands of wire that are already cut/broken/damaged. And you said the #2 spark was not as good so I would just install 2 new coils.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."1 user thanked author for this post.
well… depends i guess
if you are handy with a soldering iron….. you could splice in a new wire but you must work fast so heat does not enter the coil body and mess up the thin HV wire insulation .
those wires are not HV so some liquid tape plus one or two heat shrink wraps will protect the primary wires. Just make certain they are tucked away from moving parts.
Joining AOMCI has priviledges 🙂
I’d try a couple layers of marine heat shrink tubing if it is a motor you are just going to play around with. If it’s a motor you will be using for some fishing trips, I might get a new one. Those coils are getting harder to come by, so I’d fix it and keep it anyway. The main thing is to keep it from throwing an arc to ground. That will really cause a nasty miss.
Everyone has an opinion! When I see that “M” I know those coils are probably genuine OMC replacements. You would be hard pressed to find quality coils like that these days. I would do my best with heat shrink and make sure they don’t rub any more and use them!
dale
Here is my contribution. I would also try and
save the coil but for use on another project having
a different magneto. After soldering and applying
the heat shrink tubing I think you’ll find it difficult
to get the repair bent far enough away to keep from
having the same problem. Also I suspect that has
been like that for some time as if it was recent
the exposed copper wire would be much brighter.
Tubsall depends on skills I guess … a gentle scrape of the exposed wires, , a dab of soldering paste followed with a small but qwick blop of solder should do. Some liquid tape (2 coats) and done.
I don’t think much arcking would happen the wire being a ground wire . Even an EMF kickback at 250v isn’t going to jump anywhere.
Joining AOMCI has priviledges 🙂
I’ve repaired at least a dozen coils with the same common condition using heat shrink tube. However, none of the repairs had quite as much damage as the one pictured.
The repairs all worked as long as the smallest diameter shrink tube is used, and care is taken to ensure that the wire is tight to the “back” of the coil.
I would definitely make every effort to save this OMC coil. After the repair, how about testing it with an ohmmeter. It doesn’t seem as though that tiny wire carries a lot of current, and it may work fine.
I like the marine heat shrink tube that has heat activated adhesive on the inside of the tubing. It seals up well.
Just one more opinion to consider.
I’ve repaired at least a dozen coils with the same common condition using heat shrink tube. However, none of the repairs had quite as much damage as the one pictured.
The repairs all worked as long as the smallest diameter shrink tube is used, and care is taken to ensure that the wire is tight to the “back” of the coil.
I would definitely make every effort to save this OMC coil. After the repair, how about testing it with an ohmmeter. It doesn’t seem as though that tiny wire carries a lot of current, and it may work fine.
I like the marine heat shrink tube that has heat activated adhesive on the inside of the tubing. It seals up well.
Just one more opinion to consider.
Stick around long enough and you will always learn something…
I didn’t realize they made a marine grade heat shrink tubing.
I’m going to search up some of that and give it (along with a very careful solder) a try. I have a donor (toast/dead) coil that I got off of my Sea King. The plan at this point (depending on what I find when I take a magnifying glass to the wire damage) is to cut the wire and solder on a new lead the same length with the shrink tubing installed upstream from the damage. Once the damage is repaired, I can move the tubing down and shrink it up. I also might use some liquid tape prior to the shrink tube.
Thanks all!
Back to work…
Best Regards,
John Gragg
RIverside, CAJust starting in the hobby, please be patient.
49 Sea King 5hp GG9014A
49 Johnson TD20
48 Johnson TD20
54 Johnson QD15
55 Johnson CD12
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