how to service/open/grease a 1st gen Dura Ace Freewheel

[Midlife]

I have a sneaking suspicion that your body is like this Campag one.

Shaun

 

[ibbz]

I have a sneaking suspicion that your body is like this Campag one.

Shaun

Thanks again

Silly question
Do the sprockets just screw off? You said (and Sheldon says ) use two chain whips - does each screw odd separately ? Where would you suggest placing the first whip and which direction would I turn the other ?

 

[Pionir]

This is disassembly of a Shimano freewheel. Not sure if it's Dura Ace but probably the same. He's also got a few other freewheel videos and is very helpful if you ask questions

https://youtu.be/wCG7f6naJsQ

 

[Midlife]

Back in the 70's we took the cogs off and swapped them over as we raced / trained , mainly Regina. Yep, they just screw off. I would put a chain whip on the third cog and try and unscrew the smallest. Regina, Maillard, Campag were easy as they seemed to have lots of splined cogs held on with a screw in small cog, rather like the cassettes of today, it was Suntour that had threaded cogs all over the place. Sheldon has a whole section devoted to Suntour freewheels... Nightmare !!

Shaun

 

[ibbz]

There are a few designs, some have two sets of threads and some have slide on larger cogs held on with the smaller cogs on threads. Suntour went bananas on threads but I think Shimano were splined for the larger cogs.

Blimey my memory is bad but I don't think that's a locking on the underside just part of the outer part of the body that holds the cogs and spins around the bit that screws onto the hub.


I wonder if there is a diagram on the internet?

Shaun

i found this:

so the sprockets just screw on? ie. dont need to remove the lock ring to remove and replace cogs and spacers?

 

[ibbz]

This is disassembly of a Shimano freewheel. Not sure if it's Dura Ace but probably the same. He's also got a few other freewheel videos and is very helpful if you ask questions

https://youtu.be/wCG7f6naJsQ

Thanks! He's basically explained the lot! Thanks to all of you!

[youtube]https://www.youtube.com/watch?v=uwGCZuWPQGk[/youtube]

 

[ibbz]

Re:

Well things aren't quite what they seem.
I managed to take the sprockets off and discovered that both Freewheel bodies are different - the 6 speed is larger than the 5 speed and thus the 5 speed body cannot be converted to a 6. The cogs are interchangeable though.
The other issue is that on the 6 speed the first THREE sprockets are threaded on! And the first TWO on the 5 speed.

EXACTLY as shown on this diagram :facepalm: I'm a Plonker! I should've re-checked this carefully

So waste of effort, I need to service the 6 speed body, check the bearings pawls and grease - tedious. Can't use the perfect 5 speed body to convert to 6.

Here's some photos partially disassembled.

 

[Midlife]

Learn something new every day I had assumed that the smallest cog on the six speed screwed onto the next cog and not the freewheel body. I should have looked at your picture.............



Shaun