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Tool Talk Discussion Forum

Re: Oil shut off switch?

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Author  [Modern View]

12-23-2013 10:02:59

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I just worked on a Honda 13 hp that had a float-type oil sensor. As long as the float floats in the oil it runs. The 'canister' thingy on the side of the engine is an electronic switch that allows it to crank, but will promptly stop the engine if its not getting the right signal from the float inside the crankcase.

I would assume your Kohler is looking for oil pressure if it won't run until the filter is full. There is probably a pressure switch on the engine near the oil cooler or filter.

One thing: those float-type switches in the Honda are sensitive to being operated with old oil in them. It causes the float to stick, most times in the low-oil position.

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T in NE

12-25-2013 15:33:52

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 Re: Oil shut off switch? in reply to t.r.k., 12-23-2013 10:02:59  
If you put one in a go-cart, it will also shut the cart off upon making a right turn, until you by-pass it.

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George Marsh

12-25-2013 21:26:53

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 Re: Oil shut off switch? in reply to T in NE, 12-25-2013 15:33:52  
Many moons ago, like almost 20, my son just had to have a go-cart. I found him one that someone put a 5 hp briggs where the gas tank was attached to the carb. The go-cart was a solid frame, ruff as a cob. If you got going too fast in the yard, the gas would vibrate out of carb back to the tank. So for a few seconds, the engine would sputter, cart slowed down until the fuel pump in carb filled the carb again and away he went. Nothing you could do about it, but it was a nice speed regulator.

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robert major

12-25-2013 17:59:51

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 Re: Oil shut off switch? in reply to T in NE, 12-25-2013 15:33:52  
Hi They don't like being mounted on HY Trux crop sprayers to drive the spray pressure pump either. The guy I worked for had a 13 hp honda it would kill the motor on rough ground as it thought the oil was low. The only problem with disconnecting the switch came the days he forgot to check the oil. The switch working would of saved the cost of the new motor, when it seized solid at full revs and spat parts all over the field. It was my fault it happened, until I pointed out I was away for 4 days, so he had run the sprayer and never checked the oil!, it needed topping up a little every 2 full days work. Regards Robert

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George Marsh

12-23-2013 11:58:49

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 Re: Oil shut off switch? in reply to t.r.k., 12-23-2013 10:02:59  
t.r.k. Is it safe to say, when oil is present, the float switch is open and the gismo 2, electronic switch, is also open when you are cranking the engine? Then, after engine is running and the oil gets low, the float closes and so does gismo 2, shorting out the coil?

If I got it right, Then for testing purposes only, could a person just remove the wire going to the coil and engine would run without oil level protection?

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Billy Shafer

12-23-2013 17:55:29

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 Re: Oil shut off switch? in reply to George Marsh, 12-23-2013 11:58:49  
Yes that would work. Unless they have the ignition wired thru the switch. I have seen some like that but not many.

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Jeff nwoh

12-23-2013 12:07:55

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 Re: Oil shut off switch? in reply to George Marsh, 12-23-2013 11:58:49  
I believe that is correct. The level sensors short the coil to kill the engine. Disconnect and it should run.

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