ACman 7,505 #1 Posted November 22, 2015 (edited) Yesterday my cousin was trying to get the exhaust off the K91 for my RJ59 . He's been real careful , been soaking the nipple that goes in the block for a couple months and heating it also with no luck . So it was decided that he would remove the the elbow then slit the nipple and try to collapse it . So he put the pipe wrench on the nipple and grabbed the exhaust pipe and gave it alittle push , the next thing what happened surprised both of us. The whole thing came off . We looked at the block and a1/3 of the casting just crumbled away .Looks like it had a exhaust leak for years . Now I guess I'm on the search for a new block . Hoping to have it restored by the big show . Anyone know how long this engine was produced ? Trying to keep it as original as possible . Edited November 22, 2015 by ACman Share this post Link to post Share on other sites
Pullstart 59,561 #3 Posted November 23, 2015 any way you can use a pipe tap to chase the threads a little deeper? 1 Share this post Link to post Share on other sites
Dhodge 528 #4 Posted November 23, 2015 I have a couple 4hp Kohlers give me a call 1 Share this post Link to post Share on other sites
new2horses 287 #5 Posted November 23, 2015 Before I went out and bought a replacement, I would run a pipe tap down the hole, think you will be surprised. It has worked for me. 1 Share this post Link to post Share on other sites
Pullstart 59,561 #6 Posted November 23, 2015 Yeah, the pipe tap worked for a K-161 I had too. My tractor doesn't have it now, but I've seen small engines that have a pipe thread jam nut to help hold tight to the head too, it might be a good idea to find one of those. It reminds me of an electrical conduit nut - maybe that's what they are! 3 Share this post Link to post Share on other sites
JPWH 5,295 #7 Posted November 24, 2015 12 hours ago, pullstart said: It reminds me of an electrical conduit nut - maybe that's what they are! Make sure to use a steel rigid locknut they are available in diecast which are no good for this application and the threads are different as well 1 Share this post Link to post Share on other sites
ACman 7,505 #8 Posted November 25, 2015 Thanks for all suggestions , I'll take a closer look . I think I found a replacement ,hopefully everything works out. 1 Share this post Link to post Share on other sites
