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  #1  
Old 09-27-2010, 07:16 PM
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jeffscub jeffscub is offline
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Default what caused this?
guys, i tore the piston out of the 14 horse today and the walls are smooth as a babies butt, no scratches, pitts, or scores. everything mics out to specs. now my dilema is here in the pics, i hope you can see it. what caused this? the head looks great, other than alot of gook on it. the rings all looked good also. is this piston toast? thanks jeff
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'72 108 w/ 38" HIGH speed deck, '77 1200QL w/ homemade grader blade, '79 1450 44" grass tamer, '70 sears super 12 w/ 3pt , 19?? 100 w/ extra toys, 69' economy powerking 14 horse w/ FEL, 65' economy powerking w/ toys, 1982 allis chalmers 716


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Old 09-27-2010, 07:31 PM
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Matt G. Matt G. is offline
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That piston is toast. I'd say an overheating or lean condition caused that. Is that the side that faces the valves?
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Old 09-27-2010, 07:47 PM
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yes, matt, it is the valve side. jeff
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'72 108 w/ 38" HIGH speed deck, '77 1200QL w/ homemade grader blade, '79 1450 44" grass tamer, '70 sears super 12 w/ 3pt , 19?? 100 w/ extra toys, 69' economy powerking 14 horse w/ FEL, 65' economy powerking w/ toys, 1982 allis chalmers 716


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Old 09-27-2010, 07:50 PM
Yosemite Sam Yosemite Sam is offline
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I've seen them like that before, and I believe it is caused from carbon buildup.

Never seen it anywhere except the same side as the valves.



Just my 5 cents worth. (I believe the penny should be abolished)
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  #5  
Old 09-27-2010, 08:01 PM
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so, i'm guessing that i need to order a new piston? if so, then direct me to the best for the money place to order!!! jeff
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'72 108 w/ 38" HIGH speed deck, '77 1200QL w/ homemade grader blade, '79 1450 44" grass tamer, '70 sears super 12 w/ 3pt , 19?? 100 w/ extra toys, 69' economy powerking 14 horse w/ FEL, 65' economy powerking w/ toys, 1982 allis chalmers 716


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Old 09-28-2010, 09:23 AM
Ash_129 Ash_129 is offline
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The old piston out of my K301 looked very similar to yours. Facing the valves. It had some nasty piston slap/knock, and verticle scoring on the cylinder wall near the valve side corresponding with the piston damage/wear. I checked the rod to crankshaft and it was just out of spec (out of round). But the block did require a .020" overbore. (Had the crank turned too.)
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Old 09-28-2010, 09:39 AM
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Matt G. Matt G. is offline
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Stens will be $30-$35 or so, OEM probably $150. If you aren't boring it oversize, I probably wouldn't bother with the OEM piston, as you'll probably have to bore it oversize eventually anyway.
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  #8  
Old 09-28-2010, 11:44 AM
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johncub7172 johncub7172 is offline
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Angry Same stuff here.....
That looks like what happend to mine as well. I ran the dog snot out of mine pushing snow for a eazy 13hrs. non-stop. So when someone said overheating, I guess there right, and the fact that it is a '66 k161.One of my winter projects will be to have someone repair it. Was thinking about using my Bridgeport at work if I have to make the cyclender well bigger.
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Old 09-28-2010, 12:34 PM
giddyup306 giddyup306 is offline
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That's exactly how the piston out of my K321 looked.
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Old 09-28-2010, 02:42 PM
Cam149 Cam149 is offline
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Just pulled my head to change the leaky gasket. and what do you know my piston looked the same way! (k231) Had a nice little tower of carbon between the valves and cylinder PO must have never cleaned it.
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