Hans3 4 Posted December 6, 2019 Is the thread size of the 1st-gen steering pump (pulley) shaft 1/2-20 or another 1/2 pitch size? I want to clean my shaft threads and don't want to choose the wrong die size; thanks! Share this post Link to post Share on other sites
telriv 468 Posted December 6, 2019 We know it's a Riv. But what year as '63 & '64 are different than '65 as far as pulley's go although the thread size may be the same. Share this post Link to post Share on other sites
RivNut 3,278 Posted December 6, 2019 Try one of your lug nuts on the shaft. They are 1/2 x 20 (except for the driver's side on a 63 - those are LH thread) Share this post Link to post Share on other sites
Hans3 4 Posted December 6, 2019 '65 it is, and fairly certain that 1/2 is the correct diameter. Many online vendors quote a 9/16-18 nut, but that's definitely too large. Share this post Link to post Share on other sites
telriv 468 Posted December 7, 2019 Yes, I do believe your correct. There's a lot of bogus information out there. Share this post Link to post Share on other sites
telriv 468 Posted December 7, 2019 AND ALSO you shouldn't be using a thread cleaner die & NOT a regular die. The clean up die is a few thousandths larger & doesn't actually remove any material from the threaded part, just cleans it up. 1 Share this post Link to post Share on other sites
telriv 468 Posted December 7, 2019 AND, Ed is correct about the lug nut as an easily identifying thing to do. 1 Share this post Link to post Share on other sites
