You say you can't shut it off the normal way, so how are you shutting it off? While it could be sucking some oil past the blower seals, they usually run completely away, and there's no controlling them when they do that. Typically the problem your describing has to do more with a stuck injector. When the load comes off of the engine the stuck injector/injectors don't respond to the movement of the rack caused by the governor so they keep fueling high even when they should be cutting back to a lower fuel position. Then, on shutdown they aren't going to the no fuel position to allow the engine to stop.
Dependent upon the design of the rack the one that's stuck might be the only one staying 'on' or it might be holding all of them partially 'on'. If it was me I'd check the injectors before I did anything else.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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