|
PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
Information |
|
Smiths InstrumentsViews : 612 Replies : 4Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Feb 27th, 2019, 19:27 | #1 |
Junior Member
Last Online: Jul 22nd, 2022 19:02
Join Date: Sep 2017
Location: Hertford
|
Smiths Instruments
Hi
Does anyone know the thread size of the knurled thumb nut for the retaining brackets on the back of the smiths instruments? It doesn't match any of my thread gauges. (Through elimination I can confirm its not 3BA, 4BA, metric or 10-32!) |
Feb 27th, 2019, 21:36 | #2 |
Premier Member
Last Online: Today 22:10
Join Date: Jul 2007
Location: Connecticut, USA
|
Kev;
I just checked a junk P1800 Tach (with two fairly beat up and rusty studs)...it was close to 8-32...also close to 4mm X.5 thread, but neither felt right...so I measured the thread-count per inch and found it to be 34(!!)...maybe that's their way of assuring the securing thumbscrew (in 8-32) locks in place and doesn't vibrate off!...maybe it's a "special thread" (I've run across these in the industrial instrumentation world also)... ...so I also called Nisonger (Instrument rebuilding specialist in New York, they are on-line, if you want to send them an e-mail directly) and they noted that these are British (no surprise there...), and maybe special thread (I agree there!)...and that they are made for them in Britain, but he didn't know threadsize of-hand...that's all info I was able to ascertain... Good Hunting! |
The Following User Says Thank You to Ron Kwas For This Useful Post: |
Feb 28th, 2019, 05:19 | #3 |
Junior Member
Last Online: Today 21:30
Join Date: May 2010
Location: Shrewsbury
|
Hi,
I don't know the answer to this question but found this thread (no pun intended) which has quite a few suggestions including 2BA and the suggestion of a switch to UNF later in production. http://www.britishcarforum.com/bcf/a...p/t-58337.html I hope that is some help. |
The Following User Says Thank You to harpgirl For This Useful Post: |
Feb 28th, 2019, 12:09 | #4 |
VOC Member
Last Online: Today 14:24
Join Date: Jul 2006
Location: Chatham
|
Try https://speedycables.com/ or http://www.speedograph-richfield.com/index.html
My guess would be 3BA. |
Mar 16th, 2019, 15:23 | #5 |
New P1800 owner
|
I had the same issue. The clocks are different to the tach and speedo. after much trial and error I used 3BA nylon Large on the tach and an m3 nylon thumbs screws on the clocks the nylon being soft enough not to damage thread
|
The Following User Says Thank You to tjrvp For This Useful Post: |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|