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Go Back   Only Cub Cadets > Cub Cadets > CCC/MTD Cub Cadet built Tractors (GT)
Reload this Page 782 kt17, cant find engine miss
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  #11  
Old 05-29-2016, 01:42 PM
danfeste danfeste is offline
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The valves are sealing fine. I set the air compressor at 90 psi and moved piston to tdc compression and pressurized the cylinders, there was a very small amount leaking into the crankcase but nothing out of intake or exhaust on either cylinder. I also removed the transducer II and reinstalled the condenser. Still no change. The left cylinder is the one that's missing, it is covered with soot after running, this is the side with 85 compression. The miss decreased some if I close the high idle screw some. Also tried mowing for 20 min and still missing afterwards. The only time it will run good is the first 30 seconds when it is started cold.
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  #12  
Old 05-29-2016, 03:46 PM
J-Mech J-Mech is offline
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The valves are sealing fine. I set the air compressor at 90 psi and moved piston to tdc compression and pressurized the cylinders, there was a very small amount leaking into the crankcase but nothing out of intake or exhaust on either cylinder. I also removed the transducer II and reinstalled the condenser. Still no change. The left cylinder is the one that's missing, it is covered with soot after running, this is the side with 85 compression. The miss decreased some if I close the high idle screw some. Also tried mowing for 20 min and still missing afterwards. The only time it will run good is the first 30 seconds when it is started cold.

What did you use to check leakage out the exhaust? Your ear? You can't really hear a small amount of air through the muffler. You would have to remove it.

So, the cylinder that is missing is the one weak on compression.... I think I stated that anything under 90PSI on these engines tends to cause issues. Seen it many times. They just can't seem to run below that, unless both cylinders are and even then they struggle. I still think you have a valve issue on that cylinder. You ready to listen yet, or do you want more people to give you guesses so you don't have to tear it down again and you can throw more parts at it??
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  #13  
Old 05-29-2016, 07:31 PM
danfeste danfeste is offline
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Anyone that else that doesn't think they are gods given gift to cub cadets have any ideas? J-mech you are the reason the cub cadet fever site on Facebook has 5 times the traffic as this site. There are plenty of great guys here, but you need not comment or reply again. And I know I'm not the only one who feels like you know it all. You get off on telling anyone that hasn't learned everything there is to know about cubs by trying to prove them wrong. I'm just trying to save another old cub, by spending as little as possible. Get over yourself.
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  #14  
Old 05-29-2016, 08:19 PM
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Sam Mac Sam Mac is offline
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Anyone that else that doesn't think they are gods given gift to cub cadets have any ideas? J-mech you are the reason the cub cadet fever site on Facebook has 5 times the traffic as this site. There are plenty of great guys here, but you need not comment or reply again. And I know I'm not the only one who feels like you know it all. You get off on telling anyone that hasn't learned everything there is to know about cubs by trying to prove them wrong. I'm just trying to save another old cub, by spending as little as possible. Get over yourself.
J-Mech offered his advice, he didn't try to call you out on anything. Just my 2 cents but I think you are off base on your comments. You asked for advice and since you have decided to disagree with the advice that was given for free I suggest that you figure out what the problem is on your own. Due to your attitude I will not offer my suggestions on the cause of your problem.
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Old 05-29-2016, 09:03 PM
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dvogtvpe dvogtvpe is offline
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out of curiosity I have to ask, what kind of advice do the guys on facebook have?

I take it you haven't been able to figure out if its spark related or something else? intake gasket good ? not leaking ? you can buy a spark tester that you can leave on while its running. you could get one of those and see if its losing spark. get or borrow a cyl leakdown tester. that way you see how much the cyl is actually holding. that will give you an idea of how much air leaks by. if I remember correctly 10 is great , 20% is ok, 30% is getting hi. you could also use a manometer and measure crankcase psi. this is a pretty good indicator of engine life to.
almost forgot. do those 3 tests and depending on the results you can tell Jon he's full of hot air. or Jon can say He was right.
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Old 05-29-2016, 09:15 PM
R Bedell R Bedell is offline
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the cub cadet fever site on Facebook has 5 times the traffic as this site. There are plenty of great guys here,
IF.......that statement can be verified. Having "great guys" is not the same as having "experienced" guys. It is kind of like having a great "handyman" or a Licensed, Experienced, and Certified Electrician to do your electrical work.
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