Stuck square taper crank - can't remove using crank puller.
04-06-21 | 12:21 PM
#27
Senior Member
Joined: Oct 2014
Posts: 14,191
Likes: 5,326
From: Portland, OR
Bikes: (2) ti TiCycles, 2007 w/ triple and 2011 fixed, 1979 Peter Mooney, ~1983 Trek 420 now fixed and ~1973 Raleigh Carlton Competition gravel grinder
My post as before I could see the "femaleness" of the threads! Now I can see them both ways but for a long time I couldn't.
04-07-21 | 03:03 PM
#28
Klaatu..Verata..Necktie?
Joined: May 2007
Posts: 23,889
Likes: 17,297
From: SF Bay Area
Bikes: Litespeed Ultimate, Ultegra; Canyon Endurace, 105; Battaglin MAX, Chorus; Bianchi 928 Veloce; Ritchey Road Logic, Dura Ace; Cannondale R500 RX100; Schwinn Circuit, Sante; Lotus Supreme, Dura Ace
I was dealing with a similar problem on the 1982 Lotus Supreme I'm doing as a project. Drive side came off like it was supposed to, NDS the threads pulled right out of the crank. When I calmed down, I looked at one of the MANY threads here on BF on this very topic, and ordered a pair of chuck wedges - a pair of thin steel wedges with 'U's cut out of them. Stuck them between the BB and the crank from opposite sides, hammered on them, alternating one then the other, and suddenly the crank popped off - *CLANG!!* as it hit the floor. Amazing.
__________________
"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles
"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles
04-07-21 | 05:39 PM
#29
Senior Member
Joined: Dec 2019
Posts: 2,841
Likes: 1,062
From: South Shore of Long Island
Bikes: 2010 Carrera Volans, 2015 C-Dale Trail 2sl, 2017 Raleigh Rush Hour, 2017 Blue Proseccio, 1992 Giant Perigee, 80s Gitane Rallye Tandem
I seem to be missing where the problem is, the threads in the crank look like they're in perfect condition. So make sure the center post of the tool is fully recessed into the tool and tighten the tool into the crank. Go by hand first to make sure you line up the threads right and you should be able to turn it in by hand most of the way. Use your wrench to snug it down and then start turning the center post to pull the crank off. Cranks are a wedged fit which makes them really tight and often it feels like the threads are going to strip out. But if you have the center of the tool fully recessed when screwing in and screw the tool into the crank all the way, unless the tool really sucks the crank will just come off. Might have to really hang onto the crank though. Usually I do the non-drive side first so I can use the drive side as leverage. That lets me do the drive side using the drivetrain as the leverage which can be necessary with how tight things can be.
04-11-21 | 10:13 AM
#30
Thread Starter
Newbie
Joined: Feb 2021
Posts: 36
Likes: 5
From: Vancouver BC
I seem to be missing where the problem is, the threads in the crank look like they're in perfect condition. So make sure the center post of the tool is fully recessed into the tool and tighten the tool into the crank. Go by hand first to make sure you line up the threads right and you should be able to turn it in by hand most of the way. Use your wrench to snug it down and then start turning the center post to pull the crank off. Cranks are a wedged fit which makes them really tight and often it feels like the threads are going to strip out. But if you have the center of the tool fully recessed when screwing in and screw the tool into the crank all the way, unless the tool really sucks the crank will just come off. Might have to really hang onto the crank though. Usually I do the non-drive side first so I can use the drive side as leverage. That lets me do the drive side using the drivetrain as the leverage which can be necessary with how tight things can be.
04-11-21 | 11:53 AM
#31
Senior Member
Joined: Apr 2012
Posts: 6,017
Likes: 925
From: Nor Cal
I've found that Tri-flow works well enough for moderate stuck-ness, along with a bit of heat & percussion,
to not bother looking around for dedicated penetrating oil. At least as good as liquid wrench, for example.
to not bother looking around for dedicated penetrating oil. At least as good as liquid wrench, for example.
