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Ever Seen Something Like This?


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#1 hatedge OFFLINE  

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Posted August 22, 2013 - 06:38 PM

I opened the kohler engine off the MF 14 and this is what I found. I have never seen or heard of a piston loosing its top like that. Its not melted or anything just lost its top like a muffin!

It does look like it had a blow-by problem, that could have caused a crankcase detonation. Maybe thats how it happened?K321s mf 14 (2).JPG K321s mf 14 (12).JPG

 

Im very curious as to how this came to happen. I wouldnt want it to happen again.

 

By the way I didnt blow this myself I bought the GT that way.


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#2 toomanytoys84 ONLINE  

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Posted August 22, 2013 - 07:26 PM

Now thats interesting.

Valves ok?

See valves smash pistons, seen pistons melt, but never the tops exploded.
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#3 hatedge OFFLINE  

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Posted August 22, 2013 - 08:02 PM

Now thats interesting.

Valves ok?

See valves smash pistons, seen pistons melt, but never the tops exploded.

Thats what I say! whos ever seen something wierd like that happen? Ive seen holes in the top meltdowns valves smashing foreign stuff in the cylinders but never seen this before.

 

Well I havent inspected them valves yet but they looked ok from what i remember.


Edited by hatedge, August 22, 2013 - 08:04 PM.


#4 crittersf1 OFFLINE  

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Posted August 22, 2013 - 08:04 PM

Ring stuck on the downstroke.


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#5 LilysDad ONLINE  

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Posted August 22, 2013 - 08:24 PM

We currently have another member with this same issue.


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#6 superaben OFFLINE  

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Posted August 22, 2013 - 08:28 PM

Ring stuck on the downstroke.

 

That's got to be what happened.  That doesn't make sense, though.  There must have been weak point in the casting.

 

Ben W.


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#7 pharmer OFFLINE  

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Posted August 22, 2013 - 08:49 PM

I'll ask the engine guru I work with tomorrow (Friday). He builds all kinds of engines from Kohlers and Harleys up to all out drag and stock car engines. I'm sure he's seen it before. It is quite interesting.
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#8 diesel nut ONLINE  

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Posted August 22, 2013 - 09:59 PM

I've seen that twice at work.  Both on Kohlers.  One was a Magnum 12 and the other was a K series 14.  Never could figure out how it happend.  When I got them opend up they both looked like yours with the carbon and sludge in the pan.  All I could figure was it was how the owners used them.  Both were different owners so that made it even more confusing.  One was owned by a relative of mine so I know he beat the crap out of his because if the other repairs I had to do to it.     Stewart


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#9 JDBrian OFFLINE  

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Posted August 23, 2013 - 05:25 AM

Maybe a stress failure at the ring groove? Is that an original piston or a replacement?


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#10 toomanytoys84 ONLINE  

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Posted August 23, 2013 - 05:44 AM

Ring stuck on the downstroke.

This is what I am thinking now.

 

Based on what we know.

 

Seen happen on other Kohlers.  Must be a defect in the pistons, or a weak point.  If we could line up which size piston this occurs on.  And probably have it nailed down to bad rings, down stroke, weak casting. 

 

Boom, muffin top piston.


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#11 TomLGT195 OFFLINE  

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Posted August 23, 2013 - 05:49 AM

I'll ask the engine guru I work with tomorrow (Friday). He builds all kinds of engines from Kohlers and Harleys up to all out drag and stock car engines. I'm sure he's seen it before. It is quite interesting.

I'll keep that in mind. I have a kohler in need of rebuilding. Southwick is just about an hour from me.does he do customer work?


Edited by TomLGT195, August 23, 2013 - 05:50 AM.

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#12 Alc ONLINE  

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Posted August 23, 2013 - 05:52 AM

Isn't that the oil ring land that broke ?  Maybe something happened to the expander and oil control rings  ( might not be correct term lol ) that jamed ?


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#13 WNYTractorTinkerer ONLINE  

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Posted August 23, 2013 - 06:01 AM

Unfortunately I've seen that very thing!!   :wallbanging:   :wallbanging:

 

A new piston and rings later the thing rocked on! :rocker2:


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#14 KennyP ONLINE  

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Posted August 23, 2013 - 06:31 AM

Thanks for the pic! Very interesting. I have a K341 that quit on me this summer. Just a small screech and clunk. The the crank slowly wound to a stop. Spins over very easy with no knock or compression, like I took the rod & piston out of it! Hope to tear it down soon!


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#15 boyscout862 ONLINE  

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Posted August 23, 2013 - 07:57 AM

I'm very interested if they are original or aftermarket pistons. good Luck, Rick
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