jake22si 5 #1 Posted November 6, 2008 Does anybody know the correct thread pitch on a Kohler k241 exhaust port. the extension tube on mine is a little worn and I need a new muffler. Is it a standard size I can buy at a hardware store? Mine was always loosening up on me and the studs are gone so I cant bolt it on. :hide: Share this post Link to post Share on other sites
CasualObserver 3,406 #2 Posted November 6, 2008 It's regular NPT. (pipe thread) a nipple from the hardware store will be fine. Share this post Link to post Share on other sites
HorseFixer 2,012 #3 Posted November 6, 2008 It's regular NPT. (pipe thread) a nipple from the hardware store will be fine. and I think it is 3/4" NPT all plumbing pipe is measured inside dia. :hide: Share this post Link to post Share on other sites
jake22si 5 #4 Posted November 6, 2008 got it. all set :hide: Share this post Link to post Share on other sites
fordsonmajortom 1 #5 Posted November 7, 2008 NPT or BSP is about the only thread standard thats never changed in the UK .All the others have .We started off with whitworth and then went to your A/F and now we are all Metric. You need three sets of spanners if you are working on old and newer machines.Its a bit of a pain if you come across some old whitworth bolt and no spanner to fit it. Share this post Link to post Share on other sites
wh500special 2,053 #6 Posted November 7, 2008 all plumbing pipe is measured inside dia. Sort of. Pipe sizes are "Nominal" meaning that the nomial size doesn't necessarilly conform to the ID or OD of the pipe. Here's a pipe chart if you care to compare reality to nominal. pipe chart Schedule 40 is the "standard" thickness, but others do exist. The only beauty to this system is that ALL pipe with the same nominal size has the same OD which means that the same cutting/threading equipment can be used. Share this post Link to post Share on other sites
BPjunk 184 #7 Posted November 8, 2008 I hope I am reading your question correctly. The exhaust port on a K- 241 Kohler is machined for a 1 inch NPT pipe. Wild Bill in Richmond, Va. Share this post Link to post Share on other sites
linen beige 14 #8 Posted November 8, 2008 Wild Bill is right, 1 inch NPT for the K-241. If the nipple from the block is loosening from vibration you can install a conduit locknut on the pipe and run it up tight to the block. That should hold the pipe snug. Share this post Link to post Share on other sites