tricks to get early Shimano cassette un threaded?
07-24-21, 11:38 AM
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tricks to get early Shimano cassette un threaded?
I have an early durace 6 speed UG cassette where you need to unscrew the small cog using the double chainwhip approach.
The cog is on TIGHT I used some PB blaster on it
any ideas? tricks?
it may be i need to enlist a helper
The cog is on TIGHT I used some PB blaster on it
any ideas? tricks?
it may be i need to enlist a helper
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07-24-21, 11:44 AM
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I assume you are aware of the trick of crossing the two chain whips so that you can squeeze them together like a scissors?
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07-24-21, 11:45 AM
#3
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With the PO applied, tap the cog with a small box wrench or similar.
You want to "ring" it so the vibes help suck in the oil by capillary action.
No whacking hard!
Are you trying to orient the chain whips so you can "squeeze" the handles together?
There's always a propane torch to try to heat the cog (without heating anything else) but I'd use that as a last resort.
You want to "ring" it so the vibes help suck in the oil by capillary action.
No whacking hard!
Are you trying to orient the chain whips so you can "squeeze" the handles together?
There's always a propane torch to try to heat the cog (without heating anything else) but I'd use that as a last resort.
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07-24-21, 02:10 PM
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the squeeze handle is a new one for me....will try that and see if I can find my favorite freeze off
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Life is too short not to ride the best bike you have, as much as you can
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Life is too short not to ride the best bike you have, as much as you can
(looking for Torpado Super light frame/fork or for Raleigh International frame fork 58cm)
07-24-21, 08:36 PM
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I can’t vouch that this will work, but one of my chain whips allows me run 1/4” rope through it. Once I have it wrapped around the tire enough turns to keep it from slipping, and tie it off, it leaves both hands to remove the cog. Maybe add a pipe as an to the chain whip on the first cog for leverage.
I haven’t done this with a cog removal, but use it to remove lockrings with two hands so the tool doesn’t slip out.
John
I haven’t done this with a cog removal, but use it to remove lockrings with two hands so the tool doesn’t slip out.
John
07-24-21, 09:11 PM
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If you try out the way to hold the whip handles as suggested above, and it's still not coming and you suspect corrosion, try a drop or two of DOT3 brake fluid on the threads, carefully away from any paint. The other day I tried it on a tie rod end on a car after an hour of PB Blaster and MAPP torch heat, and it came right off.
07-25-21, 12:22 AM
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...I just took one of these off today. Freeze Off is good, but a small plastic bottle (that is acetone resistant, like the ones that Tri -flow comes in) with a little plastic applicator straw, filled with a 50/50 mix of acetone and ATF, is what I used. Mine jumped right off of there and saluted me.
07-25-21, 07:06 AM
#8
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There is a suggestion for removing rear sprockets here:
https://www.sheldonbrown.com/heroic-repairs.html
https://www.sheldonbrown.com/heroic-repairs.html
