Anonymous Poster
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- Sep 27, 2005
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Hello, everyone. Hopefully I can get some advice here. I rebuilt a Kohler K241 10hp a couple of months ago; new piston, rings, rod, and valves. The cylinder was dingle-balled, it was not out-of-round or scratched up, and the crank checked out OK also. The piston and rod that I bought are the original size. The valve seats were ground. Everything was lubed very well when it was put together. I had some help from a friend who has rebuilt a few of them, and he also did the work on the valve seats and bore (him and his father have a complete machine shop.)
I did make one mistake when putting it together, the breaker cam was put in 180 degrees out, so it did have to be torn back down to correct this (crank and piston came back out). The connecting rod I bought had the posi-lock nuts on it, and these were tightened to 200 in-lbs the second time it was installed.
It had run fine until yesterday. I ran it for about an hour after the rebuild, driving it around the street and yard to get some time on it, varying the rpm's, and then changed the oil. Since then, I've got about 10 hours on it, doing some light snow plowing, all in low gear. Last night, it started knocking real good, and sounds like I might be where I was before the rebuild.
My questions are: What could be a cause of this? Do you think the rod was put together incorrectly? I've heard some say you shouldn't re-use the posi-lock nuts. Should I get the crank turned, and buy an undersize rod? As I said, the machine work would not cost anything, it's all available.
Thanks for any help!
Jeff
I did make one mistake when putting it together, the breaker cam was put in 180 degrees out, so it did have to be torn back down to correct this (crank and piston came back out). The connecting rod I bought had the posi-lock nuts on it, and these were tightened to 200 in-lbs the second time it was installed.
It had run fine until yesterday. I ran it for about an hour after the rebuild, driving it around the street and yard to get some time on it, varying the rpm's, and then changed the oil. Since then, I've got about 10 hours on it, doing some light snow plowing, all in low gear. Last night, it started knocking real good, and sounds like I might be where I was before the rebuild.
My questions are: What could be a cause of this? Do you think the rod was put together incorrectly? I've heard some say you shouldn't re-use the posi-lock nuts. Should I get the crank turned, and buy an undersize rod? As I said, the machine work would not cost anything, it's all available.
Thanks for any help!
Jeff