Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 01-01-11, 12:00 PM   #1
bboy314
Senior Member
Thread Starter
 
bboy314's Avatar
 
Join Date: Dec 2008
Location: NOLA
Bikes:
Posts: 118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Brifters only shifting 1 direction - Shimano RSX 8spd

I recently required a bike that is probably about ten years old with Shimano RSX 8-speed components. The bike obviously was barely ridden and everything's in great shape, but both shifters are having issues. They will both shift up, but not down. As in the larger brake lever shifts, but the smaller lever doesn't shift or even click or move the cable at all, although I can push the lever in. The levers were doing this when I got them, and they felt gunky probably from old caked-up grease, so I've been flushing with wd-40 and tri-flow. This has made them feel better shifting up, but still no action shifting the other way. It almost seems like they've been somehow set into one speed but I'm not sure if that's possible.

My next step will be taking the levers apart as I've heard it's doable with these old 8 speeds. However if anyone has any input into this particular problem it would be greatly appreciated.

Thanks,

Brian
bboy314 is offline   Reply With Quote
Old 01-01-11, 12:12 PM   #2
jasonrobo02
Senior Member
 
Join Date: Jun 2008
Location: San Diego
Bikes: 2006 Bianchi 928 Record and 2002 Bianchi Axis 1x9
Posts: 204
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Are the cables hooked to the derailleurs? I only ask because I've had STI levers before that wouldn't shift with the small lever while off the bike, but as soon as you gave them some resistance by either pulling on the cables or hooking the cables to derailleurs, they would work great in both directions.
jasonrobo02 is offline   Reply With Quote
Old 01-02-11, 01:36 AM   #3
Kimmo
bike whisperer
 
Kimmo's Avatar
 
Join Date: Dec 2009
Location: Melbourne, Oz
Bikes: copy/paste links: http://velospace.org/node/36949 http://velospace.org/node/47746 http://velospace.org/node/47747
Posts: 7,099
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If they don't suddenly work with a bit of cable tension, it sounds like you have to take em apart.

Good luck.
Kimmo is offline   Reply With Quote
Old 01-02-11, 07:26 AM   #4
Mr. Embrey
Senior Member
 
Mr. Embrey's Avatar
 
Join Date: Jul 2010
Location: Saint Joseph, MO
Bikes: 1988 Cannondale ST400
Posts: 343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You have to manually wiggle the ratchet thing a bit. It's right on top underneath the plastic cover. I had to snap mine off. Shift it a couple times while looking inside it, you'll figure it out eventually.
Mr. Embrey is offline   Reply With Quote
Old 01-02-11, 11:51 AM   #5
bboy314
Senior Member
Thread Starter
 
bboy314's Avatar
 
Join Date: Dec 2008
Location: NOLA
Bikes:
Posts: 118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yeah, no luck, these were doing the same thing when they were hooked up. I tried again putting tension on the cables, but no dice. I'll try to wiggle the ratchet thingy too. Kimmo, I've already been studying your guide at great length, so soon it will be time to dive in. Thanks for posting that!
bboy314 is offline   Reply With Quote
Old 01-02-11, 05:09 PM   #6
dddd
Ride, Wrench, Swap, Race
 
dddd's Avatar
 
Join Date: Jan 2010
Location: Northern California
Bikes: Cheltenham-Pederson racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Posts: 5,069
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Mr. Embrey makes a valuable contruibution to shifter-fixers.

Many shifters have flexible plastic covers that allow a peek inside, and with the help of a small screwdriver you can manually actuate the sticking pawl.
You have to have some idea what a pawl looks like or figure this out, but once you can move it with some motor oil (not WD40 and not Tri-Flow, both are short-lived before they re-gum) it will free up nicely with repeated movement.
This process can be accelerated by warming the entire mechanism, and in fact warming it up usually gets everything clicking, at least long enough to work some oil into the pawl's pivot.

Alternatively, my guaranteed-lasting solution for these levers is not to dis-assemble but rather to remove the hoods then drop the shifters head-first into hot motor oil for an hour.

Note you can heat the oil by putting a 4"-diameter coffee can or yogurt canister with 2" of oil in it inside of a larger bowl
that has a quart of boiling water in it then cover the whole thing with several grocery bags for insulation.

The levers will get hot, and if you want to be able to handle them while shifting them during the soaking period you'll need gloves. Work them thru the gears (they'll be all freed up after 1/2 hour) then return them to the oil for another 1/2 hour before thaking them outside (still hot) and whirling them on a stout bungee or such to extract all excess oil.

Finally they need to be wiped down thoroughly with a terry towel and/or sprayed lightly with some spray solvent to get all the external oilyness under control before re-fitting the rubber hoods (moderately difficult in itself, use alcohol as a lubricant).

The shifters will now be ready for years of cold-weather service.
Note that disassembly usually results in shifters that never again see the light of day.
dddd is offline   Reply With Quote
Old 01-02-11, 07:27 PM   #7
slushlover2
Senior Member
 
slushlover2's Avatar
 
Join Date: Jan 2008
Bikes:
Posts: 449
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have never bought a bike with RSX shifters that worked. I also have never had them that I couldn't get working by flushing and relubing. I let them flush in a solvent tank and lube with Triflow. I have done dozens this way.
The non working shifters are a great bargaining tool when buying bikes!!!
slushlover2 is offline   Reply With Quote
Old 01-02-11, 08:32 PM   #8
Kimmo
bike whisperer
 
Kimmo's Avatar
 
Join Date: Dec 2009
Location: Melbourne, Oz
Bikes: copy/paste links: http://velospace.org/node/36949 http://velospace.org/node/47746 http://velospace.org/node/47747
Posts: 7,099
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by bboy314 View Post
Kimmo, I've already been studying your guide at great length, so soon it will be time to dive in. Thanks for posting that!
Yeah, sorry about the blurry pics... the descriptions prolly don't make much sense unless you're looking at the bits either, I guess. Hopefully the mechanism is identical...

But that hot oil tip sounds like it's worth a try first.
Kimmo is offline   Reply With Quote
Old 01-03-11, 12:40 PM   #9
Mr. Embrey
Senior Member
 
Mr. Embrey's Avatar
 
Join Date: Jul 2010
Location: Saint Joseph, MO
Bikes: 1988 Cannondale ST400
Posts: 343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by dddd View Post
....manually actuate the sticking pawl.

...Note that disassembly usually results in shifters that never again see the light of day.
Thanks, that's the word I was looking for. And I agree with the note at the bottom as well.
Mr. Embrey is offline   Reply With Quote
Old 01-03-11, 12:57 PM   #10
dddd
Ride, Wrench, Swap, Race
 
dddd's Avatar
 
Join Date: Jan 2010
Location: Northern California
Bikes: Cheltenham-Pederson racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Posts: 5,069
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
"I let them flush in a solvent tank and lube with Triflow. I have done dozens this way."

I used TriFlow for years. I especially liked the way aerosol TriFlow would expand like a foam to penetrate the entire shifter head immediately.

I did also notice that the resusitated shifters often gummed again a couple of years later. Your method of thorough solvent cleaning likely better prepared the pawl pivots for the TriFlow with no grease left behind to re-gum?

I Sometimes found shifters that had gummed so solidly (especially certain mtb versions) that the spray didn't work at all.
I also noticed that a later re-spray with TriFlow didn't work nearly as long as the first time.

After trying the hot-oil bath method I haven't had a shifter that wouldn't loosen and haven't had one re-gum the pawls.
It's a long-lasting repair but is of course much more time consuming also, so probably best for when the shifters are already off of the bike or for the second time around when thickened lubricants have built up.
dddd is offline   Reply With Quote
Old 01-03-11, 02:38 PM   #11
Cynikal
Team Beer
 
Cynikal's Avatar
 
Join Date: Apr 2004
Location: Sacramento CA
Bikes: Too Many
Posts: 5,921
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
If this doesn't work out for you, I have a set of Sora 8speed shifters that are almost new. PM if interested.
Cynikal is offline   Reply With Quote
Old 01-03-11, 09:06 PM   #12
DieselDan
Senior Member
 
DieselDan's Avatar
 
Join Date: Mar 2003
Location: Beaufort, South Carolina, USA and surrounding islands.
Bikes: Cannondale R500, Motobecane Messenger
Posts: 8,521
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Try spraying any chain lube in them before you even think of taking them apart. I had the same problem with some 7-speed levers, and treating them with lube brought them back to life perfectly, with some new cables and housings too.
DieselDan is offline   Reply With Quote
Old 07-08-11, 11:54 AM   #13
eeforme
Junior Member
 
Join Date: Jan 2009
Bikes:
Posts: 15
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by jasonrobo02 View Post
Are the cables hooked to the derailleurs? I only ask because I've had STI levers before that wouldn't shift with the small lever while off the bike, but as soon as you gave them some resistance by either pulling on the cables or hooking the cables to derailleurs, they would work great in both directions.
Did you ever get your brifters working?

http://sheldonbrown.com/sti-repair.html
eeforme is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 07:31 AM.