I have a 2006 Cub Cadet LT 1050 with a 23 HP courage engine. Has always run great and still does, but....
I noticed a couple of years ago that it started a "sputting sound" (lack of better description), especially at idle, on one of the exhaust ports at the exhaust pipe flange. I knew it was definitely an exhaust leak and could feel the hot exhaust in that location. I finally got around to ordering a new gasket, assuming that was the problem. When I examined the old gasket, it was intact and showed no signs of burn through, but installed the new gasket and started it up, finding that the leak is still there. I took the pipe off and examined the welding at the flange to see if maybe there was a leak there. It doesn't appear to be faulty, but after cleaning thoroughly, I'm not sure if there is a hairline crack in the weld or it's just the way the weld was finished. There doesn't appear to be any evidence of an exhaust leak coming through the flange or pipe. The new gasket showed a uniform depression from the installation, so I'm sure it's not leaking there. I examined the block as best I could with a mirror and flashlight (easier than removing engine) and down between one of the cooling fines I think I can see exhaust residue. Is it possible that there is a hairline crack in head next to the exhaust port? Has anyone ever heard of or seen this before? Other than the annoying "sputting sound" everything appears to be fine and am considering ignoring it until it presents a performance problem. I'm stumped.
I noticed a couple of years ago that it started a "sputting sound" (lack of better description), especially at idle, on one of the exhaust ports at the exhaust pipe flange. I knew it was definitely an exhaust leak and could feel the hot exhaust in that location. I finally got around to ordering a new gasket, assuming that was the problem. When I examined the old gasket, it was intact and showed no signs of burn through, but installed the new gasket and started it up, finding that the leak is still there. I took the pipe off and examined the welding at the flange to see if maybe there was a leak there. It doesn't appear to be faulty, but after cleaning thoroughly, I'm not sure if there is a hairline crack in the weld or it's just the way the weld was finished. There doesn't appear to be any evidence of an exhaust leak coming through the flange or pipe. The new gasket showed a uniform depression from the installation, so I'm sure it's not leaking there. I examined the block as best I could with a mirror and flashlight (easier than removing engine) and down between one of the cooling fines I think I can see exhaust residue. Is it possible that there is a hairline crack in head next to the exhaust port? Has anyone ever heard of or seen this before? Other than the annoying "sputting sound" everything appears to be fine and am considering ignoring it until it presents a performance problem. I'm stumped.
Kohler 23 HP Courage Exhaust Leak
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