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#21
04-02-2017, 09:21 PM
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The engine block exhaust threads are NPT, tapered. The Kohler cast iron elbow is NPS, straight. My 1450 had a shower head muffler attached with NPT steel pipe (1” for the 1450 K321 as opposed to—I believe—1 ¼” for 1650 K341). Don’t know why they build them that way but maybe it’s because the Kohler EL needs to stop at just about 90 deg & can be locked there with that lock nut—that’ll work with NPS but not NPT--but there is a possibility of exhaust blow-by, I feel, with just one turn or so thread in plus possible stripping with only 1 turn or less of thread in. What worked for me was first cleaning the block threads with a wire brush then opening them a bit using an NPS tap--threads are exactly the same as the NPT. Lubing well with PB Blaster & turning in very small increments (1/32nd to 1/16th turn in then 1/4 turn out—repeating enough to get another two turns in with the elbow for a solid connection. Lubed it up with Permatex hi-temp nickel anti-seize & can get the EL at the proper angle & with absolutely no blow-by.
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.
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