Help Removing Early Czech Zbrojovka Brno Bicycle Crank

T

thisoldbike

'Lil Knee Scuffer

• May 3, 2015

• #1

Hello sportsfans. I have a 1920s Zbrojovka Brno bike that I am going to restore. I've removed one side of the crank but cannot figure out how to remove the other side. The side with the sprocket came off with a gentle tap of the hammer. No luck on the other side. Hope someone on the forum can assist. Thanks.

 

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vincev

I'm the Wiz, and nobody beats me!

• May 3, 2015

• #2

Are you sure the other side is not s left hand thread?

 

T

thisoldbike

'Lil Knee Scuffer

• May 3, 2015

• #3

By 'left hand thread' you mean the entire assembly should unscrew counterclockwise?

 

vincev

I'm the Wiz, and nobody beats me!

• May 3, 2015

• #4

counter clockwise would tighten instead of loosen.

 

vincev

I'm the Wiz, and nobody beats me!

• May 3, 2015

• #5

Righty Tighty, Lefty loosey doesn't work with left-handed screws

 

T

thisoldbike

'Lil Knee Scuffer

• May 3, 2015

• #6

Ah okay. So if I've got this right, hold the one side with a crescent wrench and tap the crank arm clockwise?

 

T

thisoldbike

'Lil Knee Scuffer

• May 3, 2015

• #7

Okay ... tried that and she don't budge. Looking down the barrel of the crank there appears to be a square bold matching the other side but can't be 100% sure.

 

Andrew Gorman

Cruisin' on my Bluebird

• May 3, 2015

• #8

It looks like it is a square taper. Will a modern crank puller fit the threads on the remaining side? Try to find one of the old tools with TA and standard threads. If not, try a small 3 jaw puller on the on the crank. If it is stubborn some lube and heat can't hurt. Let Saint Sheldon be your guide:
http://sheldonbrown.com/tooltips/cotterless.html

 

T

thisoldbike

'Lil Knee Scuffer

• May 3, 2015

• #9

Thanks Andrew. I've give that a try and post an update shortly ....

 

Andrew Gorman

Cruisin' on my Bluebird

• May 3, 2015

• #10

Threads should be standard on the non-drive side. IF you can get a good grip on that dust cap you may be able to force the crank out enough to either pop it off ot get the puller jaws in there. Very cool bike, buy the way!