Smith's 1805 tach drive rebuild.

Mine has started leaking oil from the disc fitted opposite the cable end.

Has anyone taken one of these apart? What is involved in a rebuild? Are parts available and from where?

It seems to me, these things should have a grease zert fitted, but they don't.

Slick

Oops! Title of this thread should have been Smith's BG1508-05 tach drive.

Sorry Robert - never pulled one of these apart.
The following people restore them - maybe sell parts?
http://www.speedograph-richfield.com
http://www.howardinstruments.com.au

Cheers
Rob

Well, the Norton Gremlins struck, and i am forced to address this issue.

I tached up the Atlas this evening and the tach suddenly dropped to zero. After reaching home I checked the cable at the tach and tach drive ends .... each was fine, but I found the sealing disc on the drive was gone, along with the gear that is driven by the camshaft.
Walking up and down the highway in search of the missing parts was fruitless.

An eBay search reveals the gear is available from an aftermarket supplier. I cannot find the sealing disc ..... anyone know part number or supplier?

Slick

robs ss said:

Sorry Robert - never pulled one of these apart.
The following people restore them - maybe sell parts?
http://www.speedograph-richfield.com
http://www.howardinstruments.com.au

Cheers
Rob

Click to expand...

Thanks for the links Rob, just ordered a tach drive for the Atlas.

IIRC besides the actual disc, there is a very thin piece of springy brass AKA shim, with a dimple which makes a tiny bit pf gear thrust to remove "sloppy" clearance.
You might machine up a disc? darn close to a US nickle. IIRC

dynodave said:

IIRC besides the actual disc, there is a very thin piece of springy brass AKA shim, with a dimple which makes a tiny bit pf gear thrust to remove "sloppy" clearance.
You might machine up a disc? darn close to a US nickle. IIRC

Click to expand...

A book I have recommends using a nickel with a dimple machined in the center and a tiny ball bearing to ride between the cover and the gear.

Lacking the precision to do that in my garage, I just epoxied the brass disc into place, pouring it into a plug on top of the cover as recommended in another thread.