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Proper assembly of 70s Monark one piece crankset.

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Proper assembly of 70s Monark one piece crankset.

Old 05-08-22, 12:29 PM
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sovende
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Proper assembly of 70s Monark one piece crankset.

My ‘70s Cresent came to me incomplete and in pieces. I’m working on cleaning things up and reassembling what I have before looking for the missing components. The frame is stripped bare and is in decent condition (there’s another related thread in this C&V section).

The headset cleaned up nicely and it’s obvious how it’s to be reassembled. It’s kinda interesting that the upper headset assembly has the cone component affixed in the head tube and the cup component being the adjustable part that threads on to the steerer tube. I’m thinking that most headsets are configured with the cone being the adjustable part. Perhaps tho, I haven’t seen enough headsets.

The crankset is a Monark brand and is of the one piece configuration. It’s completely disassembled and has cleaned up nicely. I believe that I have the components separated as to DS and NDS. However, looking at the individual pieces, I’m a bit confused as to the positioning of the spacers/washers in relation to the dust shields. Are they positioned inside or outside of the dust shields and is the position the same for the DS and NDS? The crankset had previously (several years ago) been removed from the frame, reassembled (out of the frame) and stored in a parts box.

Bottom line, I’m not sure if the crankset was reassembled correctly once out of the frame? My fault, for sure, but that’s water over the dam!
I’ve attempted searching the web for an Exploded Parts View but not been successful in finding one. It would really be helpful if anyone had an EPV to share or perhaps direct me to one. Thanks
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Old 05-08-22, 05:46 PM
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subject machine is one of the Brasilian produced examples

possible that Monark marked chainset may not be from Sweden

"usually" Monark one-piece chainsets are from Fauber or Briga


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Old 05-08-22, 09:46 PM
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Originally Posted by juvela View Post
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subject machine is one of the Brasilian produced examples

possible that Monark marked chainset may not be from Sweden

"usually" Monark one-piece chainsets are from Fauber or Briga


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I appreciate that that the OEM components on this bike may be internationally sourced. The one piece crank is definitely marked MONARK on the spindle portion of the component. RE: the position of the spacers, I am going to guess that they go on the inside of the dust shields and outside of the cones. Since the dust shields rotate around the bottom bracket shell, there must exist a small gap between the inner surface of the dust shield and the outer rim of the bearing cups and the spacers will provide that gap. Im having some trouble seeing how the NDS cone is held in its final adjustment position once the dust shield is positioned. Again, Im guessing but perhaps the keyed washer/spacer maintains that adjustment when the outer threaded lock ring is snugged down. Im grateful for any input as I sail into these uncharted (for me) waters.
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Old 05-09-22, 02:44 PM
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Originally Posted by sovende View Post
I appreciate that that the OEM components on this bike may be internationally sourced. The one piece crank is definitely marked MONARK on the spindle portion of the component. RE: the position of the spacers, I am going to guess that they go on the inside of the dust shields and outside of the cones. Since the dust shields rotate around the bottom bracket shell, there must exist a small gap between the inner surface of the dust shield and the outer rim of the bearing cups and the spacers will provide that gap. Im having some trouble seeing how the NDS cone is held in its final adjustment position once the dust shield is positioned. Again, Im guessing but perhaps the keyed washer/spacer maintains that adjustment when the outer threaded lock ring is snugged down. Im grateful for any input as I sail into these uncharted (for me) waters.

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have an example of this chainset harvested from a crashed model 305

since frame badly crushed just cut the shell out to save the chainset

will take a look for you and report back...

also, member styggno1 will be able to assist

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Old 05-09-22, 05:21 PM
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Originally Posted by juvela View Post
-----

have an example of this chainset harvested from a crashed model 305

since frame badly crushed just cut the shell out to save the chainset

will take a look for you and report back...

also, member styggno1 will be able to assist

-----

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Thanks. Looking forward to what you find!
Looking at marks left by the unkeyed washer/spacer on the DS, Im thinking that it must be positioned between the inside of the crank spider and outside of the dust shield. On the NDS, I now believe the keyed washer/spacer is also placed outside the dust shield. Once the NDS cone is adjusted, the dust shield is placed over the cone. The keyed washer/spacer keeps the cone from being tightened further when the lock ring is snugged down. With access to the NDS cone being blocked by the dust shield, this seems to be the only way to jam the cone.
Unlike a three-piece crankset, that has the cones on the spindle facing out and the cups facing inward, this one-piece crankset has the cup and cone positions reversed. Cones facing inward and cups outward. I believe that the one-piece cranksets on older Schwinns are configured in a similar fashion.
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