On Saturday, January 14, 2017 at 5:13:14 PM UTC-5, AMuzi wrote:
On 1/14/2017 3:46 PM, Ted Heise wrote:


On Mon, 9 Jan 2017, 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 [both
cups stuck]

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.

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.

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.

Okay, after nearly a week of daily Blaster drips, I got
replacement pins last night. Today I was able to get the
adjustable cup out, a bit of back and forth helped.

Now I'm tackling the fixed cup, using the large bolts and
wrenches as described by Sheldon. So far I haven't been
able to get it to budge, and before I spend too much time
moosing on it I want to double confirm it is reverse
threaded. In other words, I should be turning from the
outside of the shell and not from the inside.

Thanks again to all for the great tips!


Yes but don't suffer for it. R&E (or any competent shop
which commonly services bicycles) will have a right cup tool
(Campagnolo or other) which makes that job very quick.

Your cup has 36mm flats, yes? Much better purchase on those
than simple friction against the face. Secure your tool so
it doesn't slip and damage the cup, the finish or your fingers.

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

PcB, heat and vise grips