Bicycle Mechanics - STI disasembly

and reassembly! Got a used pair of 105 8 sp units and the left one acts gummy/gritty. Do I need to remove the brake piviot pin or can I just unscrew the allen bolt and clean up?
I have had good sucess on other small mechanical items getting them fixed but have a little more in this deal and don't wanna screw it up.
TIA!!!!
kev
:confused:

:o
Durn, need my nap, wanted to say RIGHT not left.
Maybe I will wake up smarter in the morn.
kev:o

most people, including shimano, say that these are not user serviceable. That being said, I was able to take apart and rebuild my old RX100 8-speed shifter and it works ok. It was frustrating at times though.
If you have a broken part in there then it could be hard to replace.

On a similar previous thread I seem to remember someone saying that there was a parts breakdown or diagram on the Shimano Europe site. I didn't verify this myself though.

My 105's developed a similar feel to them, but I found the problem was actually a frayed shifter cable inside the cable housing. You might want to check this first. I know that some people soak their STI's with a big squirt of WD-40. They swear it works, but I wonder what it does to the rubber parts.

My right 105 shifter was acting sluggish last year. I flushed it out with WD40 to no apparent detriment to the hoods or any other part and it worked fine. I did it again a couple weeks ago with still no apparent harm.

Hope this helps, mike

Rusty cables and especially rusty cable housings is a big problem and is pretty typical.

Coat the INSIDE of your cable housings with WD-40 and let it dry.

Also, wipe down your cables with WD-40.

The WD-40 provides a reasonably good rust protection.

Then, coat the cable section that will be INSIDE the housings with grease.

This will help prevent the cables and the housings from corroding and rusting together.

I should have mentioned I bought them in this condition and they do not even have cables in them, ie unmounted.:confused: :( :confused:
kev

Originally posted by Rural Roadie
I should have mentioned I bought them in this condition and they do not even have cables in them, ie unmounted.:confused: :( :confused:
kev

I took mine apart, and when I tried to reassemble them, things didn't feel right. I realized that there is usually always a good amount of tension acting on the parts inside. I put the other end of the cable in a bench vise(between two pieces of old innertube so I did not damage the cable), and pulled back like I was reeling in a fish. It seemed to work pretty good, as it gave me an idea of how the parts reacted under the strain, rather than no tension.

Hey mike...the insides of the casings have a plastic liner the cable runs in .The cable annnot corrode to the casing.Too much or the wrong kind of grease in the casing will hose the shifting in cold weather.....regards,pokey