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Exploding Kohler Balance Gears-With Pics And Story


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#1 TimW OFFLINE  

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Posted July 28, 2013 - 08:46 PM

I have never dealt with a Kohler first hand that did this.  I purchased the tractor after the fact.  It is a 1614 Power King with the K321 14hp.  The fellow was mowing and heard a bang, then noticed oil dripping.  It blew the block out and the starter was dangling from its wires.  I found it shocking that it ran for another five minutes or so and he drove it back to the barn.  One gear was still on its shaft and the majority of the other one was somewhere in the yard.  I have always heeded the in crowds advice on never putting the balance gears back in when you rebuild.  This may help some others see why.  Also, I am pretty sure the motor was original and never rebuilt prior to this explosion.  With the size of the piece blown out, I wander if the motor was under heavy strain, if it might not have completely flew apart due to no block strength.

Attached Thumbnails

  • 140-pk 020 (1024x768).jpg
  • 140-pk 021 (1024x768).jpg
  • 140-pk 022 (1024x768).jpg
  • 140-pk 023 (1024x768).jpg

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#2 bgkid2966 OFFLINE  

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Posted July 28, 2013 - 09:00 PM

This is enough to get me to disassemble just to remove them pesky balance gears!!

 

 

 

 

Geno


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#3 WNYTractorTinkerer ONLINE  

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Posted July 28, 2013 - 09:09 PM

They don't call them "Grenade Gears" for nothing!


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#4 olcowhand ONLINE  

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Posted July 28, 2013 - 09:14 PM

Some people won't take them out no matter how much you advise them to.  These pics are graphic reasons why it's not worth the risk of leaving them in there.



#5 Bmerf ONLINE  

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Posted July 28, 2013 - 09:49 PM

Ran when parked!


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#6 MH81 ONLINE  

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Posted July 28, 2013 - 10:37 PM

Amazing, simply amazing.
Never seen one go like that.
Heard a mechanics voice in my head "Well here's your problem, right here..."

Any internal trauma other than the obvious? Crank, rod, etc?

Do you have all the case puzzle pieces?

#7 TimW OFFLINE  

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Posted July 28, 2013 - 10:41 PM

If I did not want to salvage some parts off the motor, I might cut some flexible plexiglass and cover the hole.  I have never seen the inside of a motor running.  Oh wait, the starter blew off.  If nothing else, how tough are these motors compared to the new aluminum blocked stuff.



#8 TimW OFFLINE  

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Posted July 28, 2013 - 10:48 PM

I have a major piece of the block that the starter is still connected to, but no signs of the other balance gear.  I noodled in the block and did not feel any large pieces.  You can see some scouring on the crank where I guess the gear fell between it and the block.  I think the lack of clearance between the block and crank for the gear to clear is what blasted the hole in the block.  I may just have to remove the engine intact and keep it as a display of "worst case balance gear failure".


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#9 A.C.T. OFFLINE  

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Posted July 28, 2013 - 11:58 PM

Glad I left them out on the 140 rebuild!


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#10 JDBrian OFFLINE  

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Posted July 29, 2013 - 06:00 AM

Man, that is impressive! It could have bent the crank when the gear wedged in there. Hard to believe it still ran without some other pieces getting in the works and causing further chaos. I'm glad the JD314 doesn't have those gears. The original 300 had them and a few of the first 316's. the 312 and 314 didn't have them. They vibrate really bad if the idle is too low but you don't need to worry about them ventilating the block. 



#11 LilysDad ONLINE  

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Posted July 29, 2013 - 06:35 AM

We ought to put a sticky on this thread just for all the future members who say " should I?".


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#12 Guest_gravely-power_*

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Posted July 29, 2013 - 07:29 AM

We ought to put a sticky on this thread just for all the future members who say " should I?".

Yup.



#13 HowardsMF155 OFFLINE  

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Posted July 29, 2013 - 11:00 AM

Need a couple of members to put a link to this topic in their signature, so that every time they post, other people will see it and look at the topic! 



#14 twostep ONLINE  

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Posted July 29, 2013 - 03:03 PM

So other than opening up the engine how can you tell for sure if your engine has the balance gears in it?



#15 Ryan313 OFFLINE  

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Posted July 29, 2013 - 03:08 PM

I think I have seen this tractor before! I remember seeing a picture like this, except the starter was still there with a section of the block still attached to it. When I saw the picture, I never knew what happened to it, now I finally know! This is the first time I have seen the damage caused by those gears!






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