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  #11  
Old 10-18-2015, 08:38 AM
Mike McKown Mike McKown is offline
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I had a 12 hp engine once with a broken rod. It was easy to tell what was wrong. As the engine spun over on the starter, the front of the tractor kinda' bounced up/down in a rhythm with the engine. The bouncing was caused by the imbalance of the crankshaft with no rod/piston on it.

Another easy way is put air in the cylinder. You should be able to rotate the engine to a point that no air will come out either the carb or the muffler. If you can't, you have a stuck valve. If you can, you have a broken rod.
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  #12  
Old 10-18-2015, 09:35 AM
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Originally Posted by ccollins0601 View Post
after about an hour it started to sound funny, like it was revving fast. I shut it off and when I tried to start again it would turn over but not start.
I just can't imagine an engine with a broken connecting rod continue to run until you decide to shut it off. I'm in with the "stuck valve" group.
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  #13  
Old 10-18-2015, 03:15 PM
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bocephus1991 bocephus1991 is offline
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Just pull the head and see if it's not then clean it up. I seriously doubt it broke a rod.
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  #14  
Old 10-18-2015, 08:29 PM
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You should be able to see the piston move if you remove the valve cover breather and look at the small hole in the block that is next to the stud for the cover.
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  #15  
Old 10-19-2015, 08:03 AM
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Rod or valve? Enquiring minds want to know. The suspense is killing meeee! LOL!
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  #16  
Old 10-19-2015, 08:17 AM
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I am betting on stuck exhaust valve based on the description. Yep pull the head again and see whats happening.
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Chris
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  #17  
Old 10-19-2015, 11:49 PM
ccollins0601 ccollins0601 is offline
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Rod or valve? Enquiring minds want to know. The suspense is killing meeee! LOL!
Me too! Unfortunately other responsibilities beckon and it may be a few days before I can investigate further. I will update the thread with what I find.
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Old 10-21-2015, 01:41 AM
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When you crank it over do you hear any rattling, banging or unusual knocking nosises?
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April 1979 1200 Quietline 44A deck 1988 1211 customized into a 1288 with a K301AQS 38C deck and a 1864 54” deck . Snow blades 42" and 54" . Brinly disk, brinly plow a cultivator and a $5 brinly yard rake!
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  #19  
Old 10-24-2015, 02:30 PM
ccollins0601 ccollins0601 is offline
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Originally Posted by darkminion_17 View Post
You should be able to see the piston move if you remove the valve cover breather and look at the small hole in the block that is next to the stud for the cover.
I removed the valve cover, they are moving fine. To the degree I could see through that small hole in the block, nothing moved when I rotated the engine by hand. I stuck a coat hanger in the hole and could not feel any movement.

There are some clunking noises when I rotate but nothing too loud, I'm not sure what would be normal.

Guess I'll pull the head off next.
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  #20  
Old 10-24-2015, 03:27 PM
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Sounds like broken rod. Even if the lower skirt got damaged it still may be ok. Take some pics for us and good luck
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