Originally Posted by
jonwvara
..... So after the usual unavailing PB Blaster application, I hung up the chain whip (I've now learned to stop just before the chain whip breaks rather than just after it breaks) and got out a 16-inch pipe wrench and a six-foot length of 2-inch galvanized pipe. I engaged the 14-tooth cog with the pipe wrench and cheater bar, and quickly sheared off a half-dozen of its teeth. The area where the teeth used to be gave a better purchase, and with the massive leverage I had to work with, the partially stripped cog came off easily. As is usual is such cases, the 17-tooth second cog came off easily with just the chain whip. The 6-speed body was fine.
boy... any chance that you've got photos of that setup?? Sounds impressive!
I've had similar issues with a handful of 6 speed Winner freewheels, although they are all "corncobs". My technique involves two chainwhips with 3 foot extensions of the handles. The extensions aren't on the centerline of the whips, so there is some twisting motion as I really lean on them. Soaking in PB Blaster hasn't improved things, even after waiting weeks for it to soak in.
I don't use the freewheels, so I haven't pursued them further. If I get time and motivation, thermal shock is certainly an option, as is "percussive maintenance".
I've also pondered whether I could use a dremel to cut off the stuck cog. The fear of damaging the freewheel body is a concern, though.
Steve in Peoria