pfrederi 17,040 #1 Posted October 15, 2018 There are several thread on here about removing exhaust nipples. I had my second and unexpected success today removing the nipple for a 16hp K single. I am stripping it so it can go to the machine shop. The 16hp K's use a reduction bushing in addition to the nipple. I only planned on removing the nipple and leaving the bushing in place as I figured the machine shop could work around it and i figured also it would be a bear to get out and maybe damage the block in the process. Thus I treated the nipple threads with PB Blaster, Kroil and In-Force over a few days. Whacked it with a hammer every time I walked by. Used propane torch but no movement Dug out the air chisel and the blunt point tip. Pounded a divot in the pipe then angled the chisel against the side of the divot. Low and behold the nipple started to turn. Had to make a second divot to keep an good angle as it moved. Then it stopped, Darn..some more chiseling an suddenly the reduction bushing backed out of the block.. i hadn't soaked its threads but it came!! In a vice finally separated the nipple and bushing. Nipple is destroyed but the bushing can be reused. 9 1 1 Share this post Link to post Share on other sites
squonk 38,569 #2 Posted October 15, 2018 I've used the same basic procedure on my things. Most notable, Chevy V-8 oil filters. Back in the late 70's early 80's we used to get GM powered motor homes come in the shop. They would have 20,000or so miles on them with the original filter still there. The filter would crush so we would have to tear the metal can off leaving the metal filter base with all the drain holes in it.I would use an air hammer and a blunt punch and catch one of the holes and spin off the base. 1 Share this post Link to post Share on other sites
ebinmaine 62,359 #3 Posted October 16, 2018 Just the other day I got the nipple out of the one on my own k341. I've been soaking it with PB Blaster and Kroil once or twice a month or whenever I remember since maybe January? I put a pipe wrench on the nipple and then put a piece of straight exhaust pipe probably 5 feet long on the pipe wrench. The first couple times I bit into it, it started to crush the pipe. I did this on purpose twice and kept moving the wrench up a little each time. By crushing the pipe I was separating the threads from the nipple to the bushing. Repeated two or three times and it started to turn. 1 Share this post Link to post Share on other sites