After meticulously cleaning and rebuilding my rear m/c, I discovered (while bleeding) that there's a brake-fluid leak coming from the hydraulic fitting threads on the back end of the m/c body
I've tried carefully tightening them, but I've heard the flimsy AL threads can stretch pretty easily ... I'm guessing the PO did this for me already
Is there a fix for this ??? other than scrapping the m/c. Can I tap some metric oversize threads?? Then what about the line fittings
I have a complete Time Sert replacement kit (shameless sponsor plug), and have replaced several of the AL threads on my racer (plug holes for ex.) with steel inserts with very satisfactory results. (oops ... I just realized the fittings are a tapered thread -- like a pipe thread -- so a thread insert won't cut it )
What about Teflon tape?? I might try that tomorrow.
Joined: 14 Jun 2003 Posts: 667 Location: HOUSTON, TEXAS
Posted: Thu May 06, 2004 5:18 pm Post subject:
Dana,
The threads on your rear brake master cylider are straight not tapered.
Check the seal prepartion in the master cylinder where it interfaces with the flare on the end of the brake tubing. If corrosion or spooge is evident, this could be your problem. Also check the flare on the tubing for damage. Frankly, I would replace this small sectioin of tubing for the sake of good order and a leak-free connection.
I would not use teflon tape to cure your leak. If you clean-up the master cylinder seal area and replace the tubing your leak will be fixed; it's that simple!
Regards,
Jason
'75 Norton Commando; '80 Schwinn Super Le Tour; '93 Peugeot; '90 HD Electra Glide; '99 C5
Joined: 07 Nov 2003 Posts: 124 Location: Folsom, CA (not the prison)
Posted: Fri May 07, 2004 12:18 pm Post subject:
Thanks Jason.
I'm going to order it when I finish this post.
I'm thinking that when I cleaned the pipe and on my wire wheel, I may have left some fine scratches on the flare end which, even when seated, are allowing some fluid to seep by.
I'll also get in and buff the female portion of the seat in case there's an uneven or scratched area.
Joined: 07 Nov 2003 Posts: 124 Location: Folsom, CA (not the prison)
Posted: Sun May 09, 2004 3:44 pm Post subject:
Hi Jason et al,
I just pulled it all apart (my replacement pipe piece is on its way). I noticed the shiny mating marks on the flared head only went around 75% of its circumference. That told me it wasn't seating over the entire circle, and that's where the fluid was leaking by.
I was able to see down into the female surface where it seats, and saw there was indeed some pitting (I had cleaned this area previously with a dremel, but didn't inspect with my jewlers loupe).
The pitting looks to be about .020" +/- deep, However it looks like if there was a way to cut a new seat, there's plenty of metal available.
Question: is there such a seat cutting tool???? If not, I'll make one and give it a shot ... got nothing to lose. Maybe a drill bit with the shank turned down to just slip inside the threaded nut which presses the surfaces together. If I screw the piece in, the nut will keep it centered, and the bit head will be free to move in/out and cut a new surface. The profile won't match, but the angle should be close enough to provide a clean mating surface.
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At the end of 1967 the Norton Commando was announced.
The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.
It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.
Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.
It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.
The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.
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in case there's an uneven or scratched area.
