AC output Kohler 14hp

[scagoperator]

Have a late 80's to early 90's 14hp vertical shaft Kohler on a Scag mower. Recoil start only....no battery.

This season the mower deck wouldn't engage.

Determined it was due to very little output from the regulator, further checking revealed about 19 volts AC from stator winding. Read somewhere it should be 25 volts plus.

Stator has about .2 ohms across the wires, neither wire has continuity to ground.

Removed the flywheel and discovered the 6 magnets on the flywheel had become unglued.
Inspected the stator, it appears okay, no bare wires, no indication of shorted windings.

Cleaned the flywheel and magnets thoroughly and epoxied them back on making sure they were equispaced around the flywheel.

Once the epoxy cured I reassembled it. Now the AC output is only about 5 volts at full throttle.

What the heck did I do wrong? Put the magnets in backwards or something else. There appears to be plenty of magnetism in the area.

Would buy a flywheel or stator if it would solve the problem.

Wouldn't it be great if someone had a used one I could install temporarily, if they needed it returned. In such a case I would pay shipping both ways.

Dan

 

[Bod]

Diodes?

 

[scagoperator]

What diodes? There are diodes in the regulator, but I'm measuring just the INPUT into the regulator B4 diodes convert it to DC energy.

Dan

 

[ILENGINE]

I suspect you started with a stator issue, and while removing the flywheel caused a jarring motion that released the magnets from the flywheel. when you reassembled you glued part of the magnets backwards.

When you removed the flywheel was the area behind the magnets clean or rusted like they had been loose for a while.

 

[scagoperator]

I suspect you started with a stator issue, and while removing the flywheel caused a jarring motion that released the magnets from the flywheel. when you reassembled you glued part of the magnets backwards.

When you removed the flywheel was the area behind the magnets clean or rusted like they had been loose for a while.

The stator was always okay when checked, removed flywheel because it wasn't producing enough voltage, and of course....wattage. Realized the magnetism must not be adequate. Upon flywheel removal that's when I'd noticed all the magnets were loose. The flywheel was rusted, like it had been that way for a while. Machine was sitting outside a couple years without being run. Cleaned flywheel and magnets with a wire wheel, then cleaned with brake parts cleaner b4 gluing.

In thinking about it overnight I may have realized what happened, just have to remove the flywheel to prove it.
I cleaned the magnets one at a time and placed them back in a circle but may have gotten a couple in the wrong position.
If memory serves me unlike poles should be on opposite sides of the flywheel. I may have gotten them mixed up so the stator might be seeing pole arrangement something like N-N-S-S-N-S.
I will have to check this with likely a compass.

If incorrect could a powerful magnet like a Neodymium change the pole polarity. Or is it time for a different flywheel since I've epoxied the magnets to it!

Dan

 

[ILENGINE]

If you got a good epoxy bond you will need to replace the flywheel at this time. You most likely will not get them loose without breaking them.