| Author |  Topic  | |
austingipsy
Starting Member
United Kingdom
47 Posts | |
Lupo
V4 Fan
Switzerland
105 Posts |  Posted - 15 Jun 2014 : 16:21:55  
| Hi, both main and slave cylinders have 7/16” x 20 UNF thread. I used brass brake connections with two pieces of diam.6,35 mm CuNi pipe and 40 cm long petrol Stahlflex hose (see photo), works well. Don’t forget, there must be flexible connection because of motor vibrations.
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austingipsy
Starting Member
United Kingdom
47 Posts | Posted - 15 Jun 2014 : 16:35:00
| | Thanks Lupo that's just what i needed ! | |
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austingipsy
Starting Member
United Kingdom
47 Posts | Posted - 16 Jul 2014 : 14:34:05
| | Quick update, I was lazy, took a gamble on ebay and bingo. Triumph stag clutch pipe is same size same thread and fits perfect, plus only cost me £3 for one in great shape. It's one of those orange/red ones. | |
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stevebod
V4 Fanatic
United Kingdom
416 Posts | Posted - 22 Apr 2017 : 18:33:15
| Hi All,
Just adding to this old thread because I've just replaced the clutch pipe on my car and the threads were different each end. The master cylinder thread was 7/16" UNF with 20 tpi but in my case, the slave cylinder was 3/8" UNF which has 24tpi.
This may vary from one car to another or one year to another but just wanted to add to the knowledge here.
As an aside - I ordered a new clutch hose with 7/16" UNF both ends and there was enough metal on the slave cylinder to open out the hole and retap it to the large 7/16" thread. All good. | |
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Joshinator99
Starting Member
USA
39 Posts | Posted - 23 Apr 2017 : 01:47:34
| quote:
Originally posted by stevebod
Hi All,
Just adding to this old thread because I've just replaced the clutch pipe on my car and the threads were different each end. The master cylinder thread was 7/16" UNF with 20 tpi but in my case, the slave cylinder was 3/8" UNF which has 24tpi.
This may vary from one car to another or one year to another but just wanted to add to the knowledge here.
As an aside - I ordered a new clutch hose with 7/16" UNF both ends and there was enough metal on the slave cylinder to open out the hole and retap it to the large 7/16" thread. All good.
I agree with you Steve. I just looked in my Sonett Service Manual and the master is listed as 3/8"-24 and the slave listed as 7/16"-20.
1972 Sonett III | |
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StefanM
Starting Member
Sweden
34 Posts | Posted - 27 Apr 2017 : 14:04:43
| | 7/16 thread came with the introduction of the Lockheed master cylinder. At that time girling sold slavecylinders with both 3/8 and 7/16 but later only the 7/16 cylinders were available. At some point they used an adaptor to help part supply for both threads. The 3speed slave has always been 3/8 | |
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stevebod
V4 Fanatic
United Kingdom
416 Posts | Posted - 27 Apr 2017 : 16:13:15
| Thanks all this is good information.
In conclusion then, all we can be sure is that the thread will be either 7/16 or 3/8 UNF. The only way to be certain is to take it apart and measure it I think.
I've finished my refit with a braided flexi from master to slave rather than the original system, just for simplicity. I ordered a 650mm long flexi with 90° unions each end. Cost £25.
Looks like this.
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Edited by - stevebod on 27 Apr 2017 16:15:34 | |
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RhysN
V4 Fanatic
United Kingdom
411 Posts | Posted - 27 Apr 2017 : 17:41:52
| | That looks like a great solution Steve. Could you advise the source of the hose you used. | |
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stevebod
V4 Fanatic
United Kingdom
416 Posts | Posted - 28 Apr 2017 : 21:04:32
| Hi Rhys,
Sure thing. I ordered it from.
http://www.brake-lines.co.uk/create-your-custom-brake-hose.html
I ordered a 650mm length but I reckon it could be a bit shorter if you wanted (if you use the 90 degree ends as well).
Looking at the page again I notice they do both the 7/16" and 3/8" UNF fittings if you can be sure what you need. | |
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| | Topic | |
Thread size for clutch pipe
