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tacho thread pitch #674093 11/11/16 10:54 am
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LeonGustus Offline OP
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I was so pleased with the asian repo speedo that I'm getting the 1/3 tacho to match. (my clean up of the smiths didnt last long anyway) Though installing these in the rubber binnacle requires some adjustment, my only enduring problem is how to use the mounting studs on these meters to cleanly attach them to the aluminum mounting bracket. The studs are too short to simply use a washer and nut, but something like a well-nut or longer stud would work. It would help if I knew the thread pitch on these mounting studs but alas, I'm without the proper tool. I could make an extension with a short piece of copper tubing (properly threaded)and simply screw in a bolt with rubber washer or make a longer stud. I'm hoping someone has solved this issue in an elegant fashion and would share their experience and the thread pitch required to match this probably metric stud. If it makes a difference, the meters are grey-face and were sourced from British Cycle. Shiny side up! Leon


October of 69-A50R
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Re: tacho thread pitch [Re: LeonGustus] #674094 11/11/16 11:21 am
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LarryLebel Offline
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This is the type of nut you need. This one came on a Smiths SSM speedometer I bought for my B44. Space limitations on my B44 only allow installation of the outer one. I did have 2 of these but I let one go when I sold the speedometer to the speedo restorer, aprivatepiece. From comments by others here I gather these nuts are rare. I don't know the thread size. To get the size I would try a machine screw nut on the studs to find a thread count that is close enough.

[Linked Image]

Last edited by LarryLebel; 11/11/16 12:47 pm.
Re: tacho thread pitch [Re: LeonGustus] #674110 11/11/16 1:18 pm
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LeonGustus Offline OP
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Yes, that looks perfect. For those who havent tried the conversion to asian meters - the modification of the binnacle and lack of space therein make it unsatisfactory to merely attach the binnacle to the mounting bracket and "pop" the meter therein. The meters' studs are needed to help sandwich the binnacle between the meter and bracket. BTW the trip meter knob for the asian speedo is problematic. I found a nice product sold by a co. named "portifolio". A pair of knobs part #0042638. I dont recall exactly what i did for this modification and the knob eventually fell out - so Ill attempt a better solution with my remaining knob.


October of 69-A50R
Re: tacho thread pitch [Re: LeonGustus] #674113 11/11/16 1:29 pm
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LeonGustus Offline OP
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Well, I miss-spoke. "portfolio" #0042638. Furthermore, I cant find this listed for sale anywhere. More hens-teeth to go looking for.


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Re: tacho thread pitch [Re: LeonGustus] #674178 11/12/16 2:53 am
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Stuart Offline
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Hi Leon,

Unfortunately, the "sleeve nut" suggested by Larry might not work directly. The studs on original Smiths clocks (and those sleeve nuts) are 2BA, the studs on the "Asian" clocks - at least the ones I have - are M5.

Also, the binnacle and ally mounting bracket you're working with aren't dissimilar to the speedo./tacho. mounting parts on '69/'70 triples, where I've come across the "sleeve nuts" - there they're a bit short and, because they're threaded 2BA, they have a BS hex., which is something of a pain when working on a triple. frown

The Triumph part number for the "sleeve nut" is 97-3632 but, if you use an internet search engine to look for 'em, those pictured don't look like either the part Larry pictured or the similar ones on my T150. However, if you need 'em threaded M5 for your "Asian meters", you might find it easier to turn what you need from a piece of stainless hex. bar?

Originally Posted by LeonGustus
BTW the trip meter knob for the asian speedo is problematic.

Curious. The "Asian speedos." I have or had, the knob's fixed in, unlike a Smiths. Not a problem on the first installation I did, which was into '71-on rubber binnacles, but a pain on a '69/'70 triple's binnacle, and then the repo. was too tall. mad

Originally Posted by LeonGustus
I dont recall exactly what i did for this modification and the knob eventually fell out - so Ill attempt a better solution with my remaining knob.

This one?

[Linked Image]

If so, that's the standard Smiths knob ("triumph 99-0176" for a search), and they fall out of standard Smiths speedos ... cry Having lost a couple, I've attached one to a clip and keep it with the keys in a pocket, just unclipping it when I need to reset the trip meter.

Hth.

Regards,

Re: tacho thread pitch [Re: LeonGustus] #674208 11/12/16 9:54 am
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LeonGustus Offline OP
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I love the idea of keeping the trip knob with your keys. Just like the little screw driver I keep in the cable guide rubber next to my tach. I use that to adjust the old AMAL - all too often. Back to my speedo trip knob. this is apparently a replacement part for a Litex ceiling fan and I am mystified as to how I got it. It looks very much like Stuarts' but is internally threaded at the small end. Thanks for the "m5" info. I'll need to get a tap probably. Thanks. Rubber side down! Leon


October of 69-A50R
Re: tacho thread pitch [Re: LeonGustus] #674788 11/17/16 6:40 pm
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Ian T Offline
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recently bought new binnacles for original A65 1970 lightning speedo and repro tacho. The repro tacho binnacle was too deep to take the shallower depth repro tacho so it needed the rubber base on inside ground off leaving the metal base so now is just the size to take the repro tacho. These sleeve nuts, with washer underneath (M5) fit the studs perfectly.


[Linked Image]


Sunbeam S7 Deluxe 1949
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Re: tacho thread pitch [Re: LeonGustus] #674919 11/19/16 10:21 am
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LeonGustus Offline OP
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Yeah. It's a tedious, dusty job grinding out the rubber to make the clocks fit. Ians' sleeve nuts are perhaps the best solution for attaching the studs, as they look long enough to add a rubber washer to help isolate vibration. Also, I did get a rubber binnacle once with no metal in the bottom and it yielded the best fitting so far, but it was hard to get a perfect bottom surface without also going clear threw. All in all,despite these issues, I'm very happy with both speedo and tach(extra hole for non-existant knob on tach) because of their smooth and accurate operation. If we can add the bonus of dependability I will be well pleased. Shiny side up! Leon


October of 69-A50R
Re: tacho thread pitch [Re: LeonGustus] #674997 11/20/16 7:04 am
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billy banger Offline
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Hello Leon, tri-cor England sell the extended nut that you need but the thread will be 2BA. i guess its possible that you could run the metric tap through it. a bit of a bodge but it should work
http://www.tri-corengland.com/cgi-bin/sh000002.pl?WD=97%2d1701&PN=97%2d1701%2dSpeedo%2dbracket%2dNut%2d97_1701%2ehtml#SID=25
cheers. billy.

Re: tacho thread pitch [Re: LeonGustus] #674998 11/20/16 7:06 am
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billy banger Offline
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p.s. if you put the part number 97-1701 in their website search, it will come right up. cheers. billy.

Re: tacho thread pitch [Re: LeonGustus] #675001 11/20/16 7:56 am
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billy banger Offline
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Hello again, i copied and pasted the link from tri-cor. does anyone have any idea why it didn't work. cheers. billy.

Re: tacho thread pitch [Re: LeonGustus] #675005 11/20/16 8:39 am
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kommando Online Content
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Try adding it as a HTML link in full reply mode, then it does not change some of the link into %'s, why it does that I do not know but it does.

Link to Tricor


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