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Give up on Kohler command 25hp


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#1 Auburn David OFFLINE  

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Posted April 21, 2015 - 02:05 PM

KC25 refuses to stop bending push rods and valves...so I am installing a 20/25 hp Briggs in its place..of course I have to change the pulley and electric clutch..but looks like an easy swap other than that,cant wait to get the old GT5000 back to cutting weeds and dressing the driveway.

 

 

IMG_20150304_135445_zpsbqsmyleg.jpg


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#2 greenb69 OFFLINE  

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Posted April 21, 2015 - 02:45 PM

If there are valve marks on pistons than could be many things but I am sure you know this. Wow! I can think of timing being at the top of the list. If new pistons, did the old ones have valve reliefs and these dont. Head gasket to thin, valve adjustment wrong, sticking valves. Wrong cam. If I had the money to get it I would love to figure that one out. Sorry you have had such a headache from it. Good luck with the swap. Keep us posted.
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#3 bhts OFFLINE  

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Posted April 21, 2015 - 02:46 PM

Before you give up is it the same valve and push rod or the same side doing it. Have you replaced the lifters? You may have a lifter sticking and causing the push rod to bend.


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#4 Auburn David OFFLINE  

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Posted April 21, 2015 - 04:13 PM

It runs great..till you turn it off..then it backfires and bends valves and push rods..I have replaced heads and all related hardware..always the same head..always on shut down.



#5 Auburn David OFFLINE  

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Posted April 21, 2015 - 04:14 PM

Before you give up is it the same valve and push rod or the same side doing it. Have you replaced the lifters? You may have a lifter sticking and causing the push rod to bend.

New...along with rockers...piston doesn't seem to have contacted valves(no marks)



#6 greenb69 OFFLINE  

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Posted April 21, 2015 - 04:54 PM

Something is igniting the fuel after the engine shuts down to cause a backfire on a new engine.
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#7 Auburn David OFFLINE  

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Posted April 21, 2015 - 05:04 PM

Something is igniting the fuel after the engine shuts down to cause a backfire on a new engine.

I have cleaned what little carbon was in the chamber out till it looked new..this is the 3rd time this engine has done this.I am going to replace it and tear it down and check the cam and such..I have to know whats causing this :shoot2:



#8 greenb69 OFFLINE  

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Posted April 21, 2015 - 06:58 PM

Please keep us posted. I hate that this is happening to you but I love solving these mysteries. My wife never sees me when things like this happens to me.
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#9 Auburn David OFFLINE  

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Posted April 21, 2015 - 07:08 PM

Please keep us posted. I hate that this is happening to you but I love solving these mysteries. My wife never sees me when things like this happens to me.

Will do..pulled it off the tractor today and put it in the shed to work on..dropped the B&S in place but still need to bolt everything up.



#10 Auburn David OFFLINE  

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Posted April 21, 2015 - 07:10 PM

I keep thinking it has something to do with the fuel shut off solenoid...but I have replaced that also.






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