Mercury outboard coils???

Outboard designs up to 14'

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vupilot
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Mercury outboard coils???

Postby vupilot » Wed Jan 31, 2018 3:56 pm

Wondering if anyone can help me confirm some part numbers for replacement coils of my vintage mercury.

I have a 1975-ish Mercury 402, 40hp. Serial number 7038781 = (Canadian). I show the coil as a 339-5288 part number. Those are quite expensive for new ones. I have to believe there is a superseded part number for a modern replacement. On the internet I see reference to a part # 339-832757A4 that may be compatible or a replacement for -5288. Then I believe -832757A4 cross references to the modern Sierra 18-5186. Can anyone confirm that any and all of these coil part numbers will work for my motor or not?

Thanks, the Canadian serial number of my motor often makes looking parts up a bit more difficult.

-Chris

BillW
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Re: Mercury outboard coils???

Postby BillW » Wed Jan 31, 2018 5:25 pm

I get a lot of parts from http://www.marineengine.com

Also http://www.fergusonpoolemarine.com you need to phone or e-mail Joe Poole; he is very knowledgeable

Also http://www.seawaymarine.com and http://www.oldmercs.com

Bill

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vupilot
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Re: Mercury outboard coils???

Postby vupilot » Wed Jan 31, 2018 9:34 pm

Thanks Bill,

The marineengine site had a detailed enough parts list which actually included canadian serial numbers, unlike all the other sites I had visited. It shows the canadian motors coils are indeed a different part number and according to them cannot cross reference with the newer (less expensive) Sierra parts. Thanks a bunch, I have bookmarked that site!

FYI, My issue is a cutting out of the bottom cylinder. (2cyl) The stator and switchbox are pretty new so I am hoping its the coil. The bottom cylinder coil Ohm checks just below spec and the top cylinder coil Ohm checks just above the acceptable range. The acceptable range is quite small so I am not sure the ohm test is very definitive. I'll order a $20 used coil to further investigate with before I spend the big bucks for brand new ones.


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