dingle Posted August 1, 2020 Report Share Posted August 1, 2020 Does anyone know the steering shaft thread size for a TR4 ? I am sure that Roger could probably recite it in his sleep. Thanks. Berry Quote Link to post Share on other sites
dingle Posted August 2, 2020 Author Report Share Posted August 2, 2020 Ok, I just answered my own question. According to my Haynes manual, it is 9/16" UNS, which is 27TPI. Berry Quote Link to post Share on other sites
Grahamgl Posted August 2, 2020 Report Share Posted August 2, 2020 Berry, According to Tracy Tools website 9/16” uns can be purchased in eight TPI’s Graham Quote Link to post Share on other sites
BlueTR3A-5EKT Posted August 2, 2020 Report Share Posted August 2, 2020 41 minutes ago, dingle said: Ok, I just answered my own question. According to my Haynes manual, it is 9/16" UNS, which is 27TPI. Berry What is wrong with the thread. Is it the shaft or the nut? If nut buy a new one at £4.50 each. If shaft I would use a thread file rather than hoping to align a die on the existing damaged thread. A small triangular needle file would tidy up the shaft thread if you cannot find a 27tpi thread file at the right price. Peter W Quote Link to post Share on other sites
dingle Posted August 2, 2020 Author Report Share Posted August 2, 2020 I was asking the question because another person in a local club was repairing a shaft with damage. He is welding over the threads and will recut them on a lathe. The plot thickens because he just posted that he checked another shaft and found that it was 28 TPI. I checked my shaft and could not decide if it was 27 or 28 TPI. I tried both a pitch gauge and taps. Maybe the threads were deformed from tapping on the shaft to remove the steering wheel. Learning the 9/16 UNS is available in 9 different pitches makes it even more confusing. Berry Quote Link to post Share on other sites
Z320 Posted August 2, 2020 Report Share Posted August 2, 2020 (edited) On my TR4A it is 1/4 BSP x 19 TPI Edited August 2, 2020 by Z320 Quote Link to post Share on other sites
dingle Posted August 3, 2020 Author Report Share Posted August 3, 2020 4 hours ago, Z320 said: On my TR4A it is 1/4 BSP x 19 TPI Something not right here. Berry Quote Link to post Share on other sites
Z320 Posted August 3, 2020 Report Share Posted August 3, 2020 2 hours ago, dingle said: Something not right here. Berry perhaps a smaller re-cut? Quote Link to post Share on other sites
dingle Posted August 3, 2020 Author Report Share Posted August 3, 2020 9 hours ago, Z320 said: perhaps a smaller re-cut? That would be my guess. Berry Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.