new here looking for info
07-16-21, 11:38 AM
#26
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Have you tried cranking up the force/pressure, then just leaving it that way for a while? I've found that screw-type tie rod separator tools often work when the pressure can be sustained over time. No direct experience with this with cotters, but the principle may apply.
07-24-21, 08:20 AM
#28
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Update. finally got the cranks off. frame and fork are soaking in a bath right now for rust removal. had to use some heat and an air hammer. even then it had a hard time coming out. used to have these issues with keepers getting seized in the axles of busses when doing kingpins ( same interference tapered style fit). Any how its all apart and I need to source three things. headset, bottom bracket and the pins for the cranks. bearings are shot in both headset and bottom bracket. Any recommendations as to where to start my search? thanks again guys! I'm sure I'll have more questions regarding hub overhaul and operation. thanks again.
07-24-21, 10:29 AM
#29
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thank you for this update
good to read of the progress you are making
will look forward to seeing frame and fork when they emerge from the soup - interesting to see how much of the gold colour will reappear...
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wedgebolts -
for bicycle cranksets these come in three diameters: 8.5mm, 9.0mm & 9.5mm (3/8")
Germany is one of the nations where more than one size is used, most cycle manufacturing nations employ one diameter only
so you will want to check what came out to get good fitting replacements
the pins also vary in their heaviness of cut; most assemblies employ a "medium" cut but there are some German ones which employ a "light" cut
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the headset is BSC ("English") thread of 1" pitch diameter and 24 TPI
would expect head cups to be of 30.0mm diameter, although they could be of 30.2mm
I.D. of fork crown race 27.0mm
actual national origin of replacement does not matter so long as dimensions are correct
ball size 5/32"
another variable is "stack height", i.e. how much vertical space the assembly takes up on the steerer, it is likely that this figure for the OEM set is around 35mm
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thank you for this update
good to read of the progress you are making
will look forward to seeing frame and fork when they emerge from the soup - interesting to see how much of the gold colour will reappear...
---
wedgebolts -
for bicycle cranksets these come in three diameters: 8.5mm, 9.0mm & 9.5mm (3/8")
Germany is one of the nations where more than one size is used, most cycle manufacturing nations employ one diameter only
so you will want to check what came out to get good fitting replacements
the pins also vary in their heaviness of cut; most assemblies employ a "medium" cut but there are some German ones which employ a "light" cut
---
the headset is BSC ("English") thread of 1" pitch diameter and 24 TPI
would expect head cups to be of 30.0mm diameter, although they could be of 30.2mm
I.D. of fork crown race 27.0mm
actual national origin of replacement does not matter so long as dimensions are correct
ball size 5/32"
another variable is "stack height", i.e. how much vertical space the assembly takes up on the steerer, it is likely that this figure for the OEM set is around 35mm
-----
07-24-21, 10:50 AM
#30
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Thank you soo much for the reply! Any info on the crankset bb? Any preferred places to shop? Thanks! Excited to see how it turns out.
07-24-21, 11:31 AM
#31
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bottom bracket thread is BSC ("English"), also now known as ISO
pitch diameter is 1 3/8" and thread pitch is 24TPI
drive side left hand threaded, non-drive side right hand threaded
spindle diameter is 5/8" / 15.8mm
bottom bracket shell width is 68mm (nominal)
ball size 1/4" - eleven used per side
possible that original bottom bracket spindle may show some helpful marking on its centre section
if assembly of actual german manufacture it is unlikely to be so marked however
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bottom bracket thread is BSC ("English"), also now known as ISO
pitch diameter is 1 3/8" and thread pitch is 24TPI
drive side left hand threaded, non-drive side right hand threaded
spindle diameter is 5/8" / 15.8mm
bottom bracket shell width is 68mm (nominal)
ball size 1/4" - eleven used per side
possible that original bottom bracket spindle may show some helpful marking on its centre section
if assembly of actual german manufacture it is unlikely to be so marked however
-----
Last edited by juvela; 07-24-21 at 12:37 PM. Reason: addition
