Speedo damper pot refill?

[stevepm2011]

Anyone here ever tried refilling the viscous damper pot in the ND instruments (the brass bit in the photo, above the magnetic coupling) which stops the needle from fluttering?
If so, I could use some tips on how best to do it.
The guys that restore clocks tend to keep this to themselves - understandably....
If I can figuer it out, I will share.

 

[andre g]

Maybe he can tell you
max.mahlmeister@gmx.de ?
Max is doing refit on speedos

 

[Exmoor beast]

Got a feeling a bloke on the Morini forum did it with a syringe and special damper oil. I have only ever stripped a Veglia that had a stuck odometer - took it apart, couldn’t work out what was wrong , put it together and it’s worked ever since!

 

[Schurminater]

Quick google research shows the use of RC model silicon diff oil as a damper fluid injected into the damper chamber using a syringe. Honda/Kawasaki forum mentions 30000 cst viscosity though some use a thicker oil stating its harder to get in but lasts longer?

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[Vince]

Can you do it without pulling the bezel off, eg from the back.

 

[Schurminater]

https://www.oldjapanesebikes.com/GT750J_Gauge/page-3

Bit more information, have read that some drill a small hole in the chamber, fill it then seal the hole with epoxy?

 

[iis_iis]

Rocol Kilopoise HTH j.

 

[stevepm2011]

Thanks for the input! I will try Max.
I ordered the Rocol Kilopoise a couple of days ago, syringe is already there.
Tried drilling a hole on the side of the brass pot, not so easy!
I have read that you need to remove the top of the frame. Currently thinking of a 3-d printed fixture to hold everything else in place if I do that.
Replacing housing, glass, bezels etc is easy, have done that before and machined a holder which makes it a doddle. I use a hydraulic press to compress the seals before crimping, makes sure they don’t leak…

 

[stevepm2011]

Can you do it without pulling the bezel off, eg from the back.

No, you have to strip the clock completely to be able to see it, never mind work on it...

 

[ausbean]

Have done a couple.
From what I have seen, brass damper is solid, no oil.
Aluminium ones have void for oil.
Drill hole and with thin syringe add oil.
Wait for it to wick in. Don't overfill.
Dab of KB or epoxy to plug hole.
I use 50K