On 1/9/2017 4:46 PM, wrote:
On Monday, January 9, 2017 at 2:40:36 PM UTC-8, AMuzi wrote:
On 1/9/2017 4:26 PM, wrote:
On Monday, January 9, 2017 at 2:15:41 PM UTC-8, Theodore Heise wrote:
On Sun, 8 Jan 2017 10:43:33 -0800 (PST),
wrote:
On Sunday, January 8, 2017 at 10:01:31 AM UTC-8, Theodore Heise wrote:
On Sun, 08 Jan 2017 11:08:20 -0600,
AMuzi wrote:
On 1/7/2017 8:33 PM, Theodore Heise wrote:
Hi all,

I have an early 1990s Rodriguez tandem with a rear bottom
bracket in serious need of overhaul. The cranks flop
severely.

I've pulled the cranks and the lock ring on the left side,
but the adjustable cup won't come out. It turns about a
quarter turn, but then gets too stiff to turn further.
It has no flats for a wrench instead having holes for
turning with a pin spanner--so I'm unable to put a lot of
force on it.

I've soaked it with WD40, but still no joy. Any advice
for me?

Delco 10.4020 penetrant is the best, PC Blaster is good.
Warming with a heat gun can help.

If no other path, flats can be cut on the cup with a disc
grinder to allow a wrench instead of those brittle
expensive pins.

p.s. Try the right side cup too. If that moves, you can
easily deal with the left one after disasssembly.

Thanks for the added tips. Off to get penetrating oil and new
pins now. Grinding on it is beyond my abilities, so if I'm
not able to get things off with the addition of penetrating
oil and time, I'll be hauling it off to my LBS.

As a last resort, once I simply pulled out the bottom bracket
via the fixed side and then spend half a day cutting the
adjustable cup with a hacksaw blade up to but not touching the
threads. This allowed the cup to collapse partially when the pin
spanner was applied and come loose.

If you have an aluminum frame and BB you cannot leave them
outside in the winter and should not ride through water deep
enough to threaten the integrity of the coupling.

By the way - you ARE turning the adjustable cup off clockwise
aren't you?

No, counterclockwise--same direction the lockring came off, and
the direction that every website I looked at called for. As I
understand it, the fixed cup may be threaded the other direction.

--
Ted Heise Bloomington, IN, USA

Uh, Ted, what does the lock ring and the fixed cup have stamped on them? Unless your Tandem is Italian the bottom bracket is probably either French of most probably English. That means that the adjustable side (left ride looking forward) will be threaded BACKWARDS. And it will unwind in a clockwise direction.

That is one of the most common errors of people taking bottom brackets out for the first half dozen times.


Just to clarify (I have spent a lot of time with Angel
Rodriguez and in his shop; your BB is BSC threaded) the
chain side (right side when riding) cup is reverse thread.
The non-drive side (clean side, adjustable side, left side)
unscrews like a jar lid.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

Now I'm getting confused. I have a Campy bottom bracket sitting in front of me and the fixed side has standard threads.

Is the stoker BB fit in backwards (the reverse direction) from a standard BB?


Look at your Campagnolo BB again.
If it's marked 1.370" x 24t then the chain side is reverse
thread.

If your BB is 36x24 or m35x1 then both sides are standard
thread direction.

(low frequency formats like Swiss and ChaterLea omitted)

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971