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Bottom bracket question-Motta
tried to remove the bottom bracket on my 80's Motta today, left side was OK but the ring on the right cup was stuck, Shedon Brown says Italian are both RH threads,so I tried going right and couldnt get it loose, then tried leftand still no go , I did not get really hard on it either direction for fear of stripping it,Its a Shimano Dura ace square taper BB,Before I get real heavy on the wrench, is there a way I can determine if its really a RH thread on that side?? since it appears really tough to find a square taper
bottom bracket,in Italian threads, to replace it I really do not want to risk stripping it.. Any direction would be appreciated...Thanks...(I am just going to clean and lube it) Bud |
What does it say on the BB cup? That would tell you for sure.
They are marked, you know? |
Originally Posted by Old Fat Guy
(Post 13250398)
What does it say on the BB cup? That would tell you for sure.
They are marked, you know? Bud( |
Originally Posted by oldster
(Post 13250488)
When I had the crank off I Did look very closely to see if it said , and there was no indication as to RH or LH..(think that indicates something??)Thanks,
Bud( |
Originally Posted by 753proguy
(Post 13250804)
Italian threads are right-handed on both sides. It is 36 x 24, right? Get a Zog's Cogs fixed-cup wrench, or a tool that actually clamps on, so it can't slip, but I've never seen a cup that I couldn't get off with a Zog's wrench.
Bud |
When Rebuilding Bottom Brackets, use a set-up similar to this which will help to ensure that the wrench does not slip off of the narrow nut faces. The lean on it and watch for movement. I use a good condition 12" or 15" adjustable wrench for this task...
http://www.mytenspeeds.com/My_TenSpe...5_Comment1.jpg Do not try to move the cup much. Just get it moving and don't worry about stripping the thread with minimal movement. If it moves one way, stop and then try the other. You should feel a difference in the torque required to move the nut. Go with the movement that feels the easiest, probably right hand as others have suggested. Hope this is a help and I loved my Gianni Motta Personal, even though it was a touch too large for me... http://www.mytenspeeds.com/My_TenSpe...Decal_ST_1.JPG Hope this is a help. |
It's in there really tight because:
sometimes Italian BB tend to unscrew themselves (let's not make this thread about that); and that being said they get overtightened, or they get installed with Loctite Your Motta is Italian. Sheldon's $5 fixed cup tool (Bolt+washers+nut) can be a big help. [My Personal 2000 is built up with DA as well]. But, if you are only going to clean and lube, there's really no reason to remove it. You can perform that while the cup is still installed in the frame. |
Originally Posted by oldster
(Post 13250283)
Thanks...(I am just going to clean and lube it)
Bud
Originally Posted by Ex Pres
(Post 13251784)
But, if you are only going to clean and lube, there's really no reason to remove it. You can perform that while the cup is still installed in the frame.
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Ok , well,I cleaned and lubed it, and all looks well, and it felt really good after adjusting, so , I am gonna pass on anymore fooling around with it,
And a huge thanks to all for the help in keeping me from making this more than it otta be!!! Bud,,,, |
Right Hand thread means LEFT to unthread.
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they get installed with Loctite Just though you might find that interesting, however... If very fine threaded aluminium threads, such as those on a Triumph Bonneville timing case, the 242 will actually rip the threads out, believe it or not. |
If this is an 80s vintage Dura-Ace bottom bracket, the Campagnolo 793/A fixed cup tool will make short work of that job.
http://www.os2.dhs.org/~john/793a-2.jpg Any decent shop with a Campy tool kit should have one. But as ColonelJLloyd noted, there's no compelling reason to remove the fixed cup unless you need to replace the whole bottom bracket. |
Originally Posted by vjp
(Post 13251996)
Right Hand thread means LEFT to unthread.
|
No need to take out the fixed cup unless you're getting the frame painted...
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Right, how does the ditty go...
"clockwise tighty, counter-clockwise loosey" It is Right Hand Thread not Clock Wise thread, talking about ambiguous.
Originally Posted by JohnDThompson
(Post 13253167)
Or, less ambiguously, counter-clockwise.
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This is the Motta eguess the picture went like my first try at the BB
Bud |
Originally Posted by vjp
(Post 13253933)
Right, how does the ditty go...
"clockwise tighty, counter-clockwise loosey" It is Right Hand Thread not Clock Wise thread, talking about ambiguous. |
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