foster461 Posted June 25, 2020 Report Share Posted June 25, 2020 On the rear end of the early TR3 and I assume TR2 starter motor, the so-called Bomb type, there is a threaded stud for the starter cable connection. I am missing the nut that goes on this stud. The starter motor still has the brass jam nut that secures the stud to the case so I took that nut to the hardware store expecting it to match something but it does not. The stud is around .25 inches diameter but what the heck is the thread ? Stan Quote Link to post Share on other sites
Dic Doretti Posted June 25, 2020 Report Share Posted June 25, 2020 BSF. Quote Link to post Share on other sites
BlueTR3A-5EKT Posted June 25, 2020 Report Share Posted June 25, 2020 As stated it is 1/4" BSF Also same thread as used on the later TR3A-4A starter terminal post. Lots of other British cars of the era with the 418G type Lucas starter will have the same threaded terminal post. (MGB, AH 3000, Jag. etc) Cheers Peter W PS If stuck I do have a couple of spares - That said there ought to be someone in your part of the world with a spare. Quote Link to post Share on other sites
foster461 Posted June 25, 2020 Author Report Share Posted June 25, 2020 Thanks guys, I would never have figured that out. I see BSF threads have a tpi number, is 1/4 bsf always 26 tpi ? and is this brass nut from Moss USA what I need ? https://mossmotors.com/hex-nut-brass-1-4-26-bsf Quote Link to post Share on other sites
BlueTR3A-5EKT Posted June 25, 2020 Report Share Posted June 25, 2020 Yes 1/4" x 26 BSF is a standard form. see here https://www.ring-plug-thread-gages.com/PDChart/BSF-thread-data.html my only concern is that I think the hexagon size of the Moss nut will be smaller than the original Lucas item. Not the end of the world if the thread fits ok. cheers Peter W Quote Link to post Share on other sites
Dic Doretti Posted June 27, 2020 Report Share Posted June 27, 2020 On 6/25/2020 at 11:54 PM, BlueTR3A-5EKT said: my only concern is that I think the hexagon size of the Moss nut will be smaller than the original Lucas item. Not the end of the world if the thread fits ok. That could be an advantage, the original nut need a 1/4" whitworth spanner while the smaller nut needs a much more readily available 1/2" unf spanner unless, horror of horrors Moss has gone metric. Cheers Richard Quote Link to post Share on other sites
foster461 Posted June 27, 2020 Author Report Share Posted June 27, 2020 I will know in a few days when Moss ships the order. They have a couple of different nuts so I'll see which works the best. This starter doesnt fit my 1960 TR3a so I'm going to try and sell it to someone who can use it but it works and I'd like it to be complete. Moss has a minimum order and a couple of nuts doesn't come close so I had to add some toys for ballast. Quote Link to post Share on other sites
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