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Kohler Kt-17 Running On 1 Cylinder


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#1 LTD OFFLINE  

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Posted September 25, 2013 - 08:26 AM

  The engine is in my Cub Cadet 682. Kohler Kt-17 Series 2. It is the cylinder on the left side that is not firing. Engine has a new plug and coil. Spark is very nice and strong. Cylinder that's not firing has 100 lbs of compression and the one that is has about 115 lbs. Pulled the head. Everthing looks good. Running out of ideas.Anybody had this problem before?


Edited by LTD, September 25, 2013 - 08:27 AM.


#2 olcowhand OFFLINE  

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Posted September 25, 2013 - 08:53 AM

If this has a single coil with 2 spark plug leads that fire at the same time, try swapping them to opposite sides if you can.  Sometimes when these coils go bad, they do strange things.  Could be under compression the spark isn't there.  If it's the coil doing weird things, this should cause the other cylinder to not fire instead.


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#3 Texas Deere and Horse OFFLINE  

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Posted September 25, 2013 - 09:00 AM

If this has a single coil with 2 spark plug leads that fire at the same time, try swapping them to opposite sides if you can.  Sometimes when these coils go bad, they do strange things.  Could be under compression the spark isn't there.  If it's the coil doing weird things, this should cause the other cylinder to not fire instead.

 

I agree with Daniel, I would look at the coil first. Maybe you lost 1 side of the windings??


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#4 olcowhand OFFLINE  

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Posted September 25, 2013 - 09:05 AM

It could be jumping internally, and it could favor one side over the other.  Seen it happen before, and it'll drive ya nuts trying to figure it out when it does this.


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#5 JDBrian OFFLINE  

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Posted September 25, 2013 - 10:33 AM

As said above the spark could be shorting out inside the coil but also from the wire to the engine chassis. The wire could also have an open circuit in it that is reducing the voltage. so if switching coil sides doesn't solve your problem try the wires.


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#6 LTD OFFLINE  

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Posted September 25, 2013 - 10:36 AM

Thanks for the help,guys. The coil is new, along with the plug wires. Have tried switching sides on the coil. Doesn't help.


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#7 olcowhand OFFLINE  

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Posted September 25, 2013 - 11:11 AM

Hmmm....thinking, thinking.  The 100psi is fine, and not enough difference from the other side to be concerned about.  If the exhaust valve were not opening for some very weird reason I couldn't imagine, then it would still build compression but not be able to pull in a charge to fire.  This would almost have to be from a worn away cam lobe, so VERY doubtful.  I will keep thinking on it.


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#8 MH81 OFFLINE  

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Posted September 25, 2013 - 04:06 PM

HAve you tried another plug?  I know you said it was new, but with today's manufacturing... well, y'know


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#9 EricFromPa ONLINE  

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Posted September 25, 2013 - 04:11 PM

If your 1 cylinder is a bit lower on compression even by 5lbs and the Carb is dirty or the fuel pump is weak it will pull most of the fuel in the cylinder with higher compression.You could also have a leaky intake gasket on the 1 side.That will also cause it not to pull fuel into 1 cylinder.

 

 

Hope it's a simple fix.


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#10 HDWildBill OFFLINE  

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Posted September 25, 2013 - 04:30 PM

This may sound like a dumb question but on the cylinder that is not firing is the plug wet?  


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#11 LTD OFFLINE  

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Posted September 25, 2013 - 05:12 PM

HAve you tried another plug?  I know you said it was new, but with today's manufacturing... well, y'know

Yep. A couple different ones.



#12 LTD OFFLINE  

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Posted September 25, 2013 - 05:14 PM

This may sound like a dumb question but on the cylinder that is not firing is the plug wet?  

Not very. Just a little bit. If I leave the plug wire off the side that's firing, and crank the engine with it on the side its not; after a couple seconds of cranking it will backfire(very loudly!!!) out of the muffler.



#13 olcowhand OFFLINE  

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Posted September 25, 2013 - 05:20 PM

Not very. Just a little bit. If I leave the plug wire off the side that's firing, and crank the engine with it on the side its not; after a couple seconds of cranking it will backfire(very loudly!!!) out of the muffler.

 

That sounds much like a gas fouled spark plug.


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#14 HDWildBill OFFLINE  

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Posted September 25, 2013 - 07:02 PM

Have you tried swapping the plugs?  It really sound like an engine a buddy was working on one day.  He was just doing a regular service on it and had replaced the plug with a brand new one.  Checked the gap and it started missing, back firing and died.  I suggest putting the old plug back in and it ran fine.  He got another plug off the shelf and it ran fine as well. 


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#15 LTD OFFLINE  

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Posted September 26, 2013 - 08:37 AM

Have you tried swapping the plugs?  It really sound like an engine a buddy was working on one day.  He was just doing a regular service on it and had replaced the plug with a brand new one.  Checked the gap and it started missing, back firing and died.  I suggest putting the old plug back in and it ran fine.  He got another plug off the shelf and it ran fine as well. 

I have tried a couple different plugs. The old ones were Champions. I have tried an NGK and a new Champion. What brand do you guys usually run in these?






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