Tachometer drive

[linker48x]

This is a simple and minor question, but I’m puzzled and I can’t find a picture to answer my question. I’m reviving my 1966 Mark 3 after 40+ years parked, and since they were missing I had to buy all new bits for the tachometer drive— the slinger disc, the spring bushing, and the little lug that connects the drive in the bevel cover to the camshaft. My question is—in what order do the slinger and spring bushing go in? I can see, maybe, that the slinger doesn’t go against the cam, there’s no room for it there, but there’s no witness mark for it back against the bevel cover either. Does it go there or between the little drive lug and the spring bushing, with the bushing against the bevel cover?

[Rick]

From the manual:

tach drive.png

[linker48x]

Yes, Thanks a lot for taking the trouble Tyonek find that, I looked at that, before I posted, it has the slinger disc against the cover but that doesn’t seem right. Anyone had one of these apart recently?

[Jordan]

It's installed onto the tang on the shaft of the tacho gearbox spindle.
Then fit the Oldham coupling and the split tubular thing.
Offer it all up to the head so the tang on the coupling goes into the slot in the end of the camshaft.
The little fan disc can be fitted in two orientations. Put it so it tends to blow oil mist away from the gearbox.

[linker48x]

*to. Not Tyonek.

Spell check—sheesh.

[linker48x]

Thanks. Just like in the diagram. Shoulda known LOL.

[linker48x]

And, even though it is far, far off topic of the tachometer drive, I am so darned pleased I will also say, I got a new JE 64.5 piston from Malcolme Tunstall for my '66 Mark 3 when I was in St. Pete in October, rebored and replaced it, reshimmed the valves and the tower shaft, replaced the points and condensor and retimed the ignition, and it started and ran beautifully, really for the first time in 40 years (except I did start it about 10 years ago, once, when I immediately determined it needed this piston). Now I am looking forward to it, but since it is hard winter in Alaska now, it will be 5 months +.