1864 keeps running for a while after turning key off
 

My 1864 keeps running for a while after I turn the key off, slowly loses rpm and finally shuts off. I had already replaced the ignition switch, because it was bad. It also wasn't charging and I found the stator to be bad. I have replaced it and the engine is ready to go back in. Is there anything else I should be checking for the shutdown issue? It really bugs me, since it obviously isn't right.
Thanks

I think you either got dieseling OR your Magento is grounded poorly upon shutoff..

Dieseling is usually from hot spots, usually on carbon buildups, in cylinder that causes ignition besides spark. The hot spots could be cause by lean conditions, poor cooling, etc Etc.

When shutting off your engine, the key switch at off grounds the magneto, thus killing spark.

Mount a toggle switch on the dash and hook it in series with the fuel solenoid on the carb. Turn the switch off and the engine should stop in a few seconds. I did this to mine and it works great. Just remember to turn the switch on before trying to start the engine.

Billy
No, it isn't dieseling. This is an electrical problem. All of the connections were dirty and oily and I cleaned everything pretty well when I had it apart, including power washing and de-greasing it. I ended up replacing both crank seals, breather hose and gasket, intake and exhaust manifold gaskets, oil pressure switch, stator and a few other small parts, so it was due for some maintenance. Hopefully this issue will be gone when I get it put together tomorrow.

I'm going guess that an 1864 is too old to have a fuel shut off soleniod carb, unless it's been modified. Also doesn't simply turning off the key serve the same purpose as your switch, unless
you have a leaky carb and want to empty the float bowl first. Either way the original problem hasn't been fixed.

The Kohler CH18 in the 1864 does have a fuel shutoff in the carb. I like to idle my some before I shut it off and if the engine is hot, it will diesel when you turn off the key because there is still some fuel available. I kill the fuel solenoid, and the engine will continue to run for 10 to 15 seconds. then I kill the ignition switch. Just a smooth shut down.

1864 keeps running for a while after turning key off
 

You could try turning off the engine with the pto engaged/mower deck running after idling a few minutes. The load of the deck will cause the engine to shut down quicker.

I do idle it for a little while before shutting it off and it's the only one of four Commands here that doesn't shut down immediately when the key us shut off. I guess if it isn't fixed, I may have to add a switch, like RLause suggested.

I did test the fuel solenoid to make sure it closes when 12V is applied and opens right away when power is removed. I thoroughly cleaned all of the grounds and terminals on the wiring harness. The stator was burned in one area and insulation was worn off of its wires in one place, so I'm hoping I fixed the problem. I got it put together today, so I'll be testing it tomorrow after I do a little maintenance on the deck.

Make sure that when the key is turned off, that the power to the IGN system/coil is also disconnected, or if it is a magneto system, that the magneto kill wire is grounded.
I've seen on a battery powered Ign system, someone modifies the wiring,and the power, while it is disconnected from the battery, it is still being fed by the alternator and thus the engine will continue to run for a bit.
Or,
someone purchased a "will fit" IGN switch.
Do check it out as you are describing a similar situation.
ASSUME NOTHING, TEST!

I do agree that shuting off the fuel to empty the float bowl on an older Cub that doesn't have the fuel solenoid so a leaky carb doesn't drain your whole fuel tank on to the floor, that still doesn't solve the original problem. There is something wrong, whether it's dieseling or, electrical.The real problem should be fixed first.

ol'George
I did replace the ignition switch and it was a genuine Cub Cadet switch. That's a good point, both about a possible incorrect switch and about the ignition system not being grounded when it needs to be. Honestly, there was enough oil/dirt/grass mixture caked on everything that it could very likely have be a ground issue. I'll see if it's fixed a little later today.

johnwd98
I agree, I want to know I have the real problem fixed first. I'm one of those people, probably a case of ocd, that just can't stand to let something like this go. I let it go part of the summer, so my dad could use it to mow with and now it needs fixed.

I do have a small ball valve in the fuel line of my older tractors, to prevent a leaky needle and seat from filling the crankcase with fuel. I think it's a good idea, especially when most of mine sit for several weeks or even a year in between uses.

johnwd98
I agree, I want to know I have the real problem fixed first. I'm one of those people, probably a case of ocd, that just can't stand to let something like this go. I let it go part of the summer, so my dad could use it to mow with and now it needs fixed.

I just thought of something else, If the only way to shut down the engine is to install a cut off switch on the solenoid, then what do you if you want get off your Cub and walk away for 10 minutes or more? Do you shut off the fuel and wait for it to empty the float bowl then shut the key off, meaning a longer cranking period next time, or do you just shut off the key and wait, either way you would be waiting. Does your Cub have the "safety" kill button on the seat? There could be more complications would arise with fuel solenoid cut-off switch if not fixed correctly first. I believe the cut-off switch to be not be a bad idea but, only if your done for the day.

John when properly wired the engine is shut off by grounding the mags. The white wire is the kill wire. Your ignition switch should ground the white wire when you turn it off. The fuel solenoid requires power in order to open and allow fuel flow. The white wire on the engine goes to the yellow wire on the ignition switch so if you ground the yellow wire it should shut off.