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  Stator on Black Max died twice in a month?

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Author Topic:   Stator on Black Max died twice in a month?
JohnNorthEast posted 08-15-2002 11:15 AM ET (US)   Profile for JohnNorthEast   Send Email to JohnNorthEast  
I have a mercury Black Max 150( 1985)on my 1985 Outrage ( 18 foot) . About a month ago I had to replace the stator. I believe it was the orginal part with the motor. This weekend the same problem returned. My mechanic said for some reason the new stator went. I am now on my second stator. Perhaps this is a fluke but I am wondering if others have and similar problems? Is there any reason the stator would be prone to die out on a motor?


rsess1 posted 08-15-2002 11:19 AM ET (US)     Profile for rsess1  Send Email to rsess1     
I had the same thing on my Mercury 2.5 EFI. (not on whaler) I keep the boat in a boathouse with a built in battery charger that I always plug in. The motor always started after storage, but battery was dead 15 minutes after running every time. I really needed a new battery ($50) but put it off. Turns out I burned out the stator because the stator was working to charge electrical system efi and battery too hard and "melted" This was an expensive lesson.
jimh posted 08-15-2002 11:23 AM ET (US)     Profile for jimh  Send Email to jimh     
Do you happen to know which winding on the stator went bad? Typically there are multiple windings. One winding is for generating battery charging current; others are for ignition spark timing and generation.

If the winding associated with battery charging went bad, I would look carefully at your battery situation. Perhaps your lead-acid battery is in poor condition and is not charging fully. This would put quite a load on the engine charging and may have caused it to overheat.

If the windings associated with iginition timing and spark generation are bad, look for some unusual current path allowing high voltage current to flow back into the stator coil and damage it.

There is also the possibility of mechanical damage to the stator from being hit by something, perhaps a loose or out-of-position magnet on the flywheel.

If I had to guess I would suspect there is something amiss in the high-voltage ignition wiring. Look for a bad ground, broken down components, etc., in the high voltage wiring.

jimh posted 08-15-2002 11:26 AM ET (US)     Profile for jimh  Send Email to jimh     
Also, look closely at your battery. Does it perhaps have a shorted cell? This would cause the charging current to always be high as the battery voltage cannot rise much above 11 volts. You might still be able to start the engine and run it, but the poor charger will be trying to sink current into the battery constantly.
JohnNorthEast posted 08-15-2002 11:56 AM ET (US)     Profile for JohnNorthEast  Send Email to JohnNorthEast     
Thank you for the quick response. I am told the problem is on the ignition side and has nothing to do with the battery. I will keep the board updated. Hope to get this fixed soon as I am planning on taking the boat up to Maine this weekend for a week on an island off of Portland!
lhg posted 08-15-2002 03:12 PM ET (US)     Profile for lhg    
It's possible you simply got a bad "new" part. I had it happen once myself. But Mercury guarantees replacement parts for a year, and labor to install, so there should be no charge for the second one at all.
JohnNorthEast posted 08-15-2002 06:33 PM ET (US)     Profile for JohnNorthEast  Send Email to JohnNorthEast     
OK- appparently the switch on the motor shorted out. This was misinterpreted as a failed stator. Hum, new switch and all is fine.

Steve Leone posted 08-18-2002 02:20 AM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
just for ducks, and outboard motor owners...if you`re bendix on the starter motor is NOT dis-engaging from the flywheel you will indeed burn out a power-pak and/or a stator. steve

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