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Engine Shutting Off


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#1 jacreech OFFLINE  

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Posted August 17, 2012 - 07:18 PM

My 1977 Bolens QS16 (Kohler 16 hp K341) runs great for 20-40 minutes, then abruptly shuts off. I have good spark when I check it, fuel from the pump to the carb. Replaced the inline circuit breaker thinking it might be bad and have checked all wiring. Could it be a bad ignition switch cutting out in the run position? I don't see how it could be the coil, points, or condenser, since when it runs it runs strong. Battery is also good and being recharged by the stator. The engine is only 3 years old.

Any ideas for me to check?

Thanks!!

Jim

#2 olcowhand ONLINE  

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Posted August 17, 2012 - 07:21 PM

After it dies, will it start back up right away?

#3 jacreech OFFLINE  

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Posted August 17, 2012 - 09:39 PM

For the past few weeks it has been re-starting quickly, but with each re-start it runs for a shorter duration before cutting off again.
Today it cut off and won't re-start at all. It tries to start - fires a few cycles - then dies. As if not getting enough fuel. That's why I wonder about a partially clogged carburetor. But if it's the carb, would it run well for 30 or 40 minutes before it cuts off? Doesn't make sense to me.

#4 jd.rasentrac OFFLINE  

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Posted August 18, 2012 - 03:04 AM

First time it sounds like getting no fuel. Cleaning the tank and the hose and using a fuelfilter may help.

#5 JDBrian OFFLINE  

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Posted August 18, 2012 - 05:28 AM

It may not be a fuel problem. I would check for good spark right after it gives up on you. It could be a heat related problem in the coil or it could be a flakey set of points. Check the point gap and condition and make sure the push rod is not worn and is moving freely. The fact that it is was consistently shutting off after a certain amount of time makes me think it is something to do with heat causing an electrical problem of some kind. Good luck getting it sorted out.

#6 KennyP OFFLINE  

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Posted August 18, 2012 - 05:49 AM

Might be the condenser?

#7 IamSherwood OFFLINE  

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Posted August 18, 2012 - 06:06 AM

Ditto, it sounds like an electrical/heat problem. Didn't someone have a coil acting up the same way recently?

#8 Canawler OFFLINE  

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Posted August 19, 2012 - 08:54 AM

I had an identical situation on the magnum in my Troy-bilt. Ended up being the fuel pump. The pump's internal check valve on the outgoing side would come loose as the casting would heat up. I'm not sure if the KTs use the same pump as the Magnums but when I did a bit of looking around in the various forums I found a lot of references to those symptoms and Kohler fuel pumps.

I fixed mine with an electric pump.

Edited by Canawler, August 19, 2012 - 09:25 AM.

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#9 MH81 ONLINE  

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Posted August 19, 2012 - 09:03 AM

It may not be a fuel problem. I would check for good spark right after it gives up on you. It could be a heat related problem in the coil or it could be a flakey set of points. Check the point gap and condition and make sure the push rod is not worn and is moving freely. The fact that it is was consistently shutting off after a certain amount of time makes me think it is something to do with heat causing an electrical problem of some kind. Good luck getting it sorted out.

I had an identical situation on the magnum in my Troy-bilt. Ended up being the fuel pump. The pump's internal check valve on the outgoing side would come loose as the casting would heat up. I'm not sure if the KTs use the same pump as the Magnums but when I did a bit of looking around in the various forums I found a lot of references to those symptoms and Kohler fuel pumps.

I fixed my mine with an electric pump.


You guys both have me convinced. :)
If it's a fuel pump problem, can he verify / test with a temporary tank above the engine and have it gravity feed? Even a small tank from a push mower would run it for that long. Then if it runs all day or shuts down, he'll know which direction to start looking?

#10 Guest_gravely-power_*

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Posted August 19, 2012 - 09:08 AM

I had an identical situation on the magnum in my Troy-bilt. Ended up being the fuel pump. The pump's internal check valve on the outgoing side would come loose as the casting would heat up. I'm not sure if the KTs use the same pump as the Magnums but when I did a bit of looking around in the various forums I found a lot of references to those symptoms and Kohler fuel pumps.

I fixed my mine with an electric pump.


The Magnums and K's are pretty much the same engine.

I would say a fuel problem and the pump is the prime suspect in "this" case. By pass the pump and run And see what happens.

#11 johndeereelfman OFFLINE  

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Posted August 20, 2012 - 07:50 PM

Check to see what the points push rod is made of. If it's the fiberglass type, throw it away and replace it with a metal one. The fiberglass type start to wear after a while, start absorbing oil, and then swell, which causes sticking after the push rod heats up.

One other thing that it could be, if not a push rod or fuel problem, is to check to make sure you still have the three screws tight, that hold the air cleaner base to the carb. Sometime these screws work out, and get sucked in through the carb, and find thier way to the intake port, causing the valve to stick open.




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