Lincoln "L" Technical Questions

I misread the post. Sorry for the confusion.

I hope you haave the reprint Lincoln Service Manual and Service Bulletins published by the LOC - they are a priceless resource. The early Lincolns are of very high quality in design and manufacture, but they have a lot of quirks that are quite different than most cars of the 1920s and -30s..  
Good luck with your '30 - these cars are worthy of preserving, and can be fun to drive, once you get accustomed to non-synchromesh transmission, among a few other character traits of all cars of that era.

Thank You Allan, very helpful. I worked on every car my Dad ever owned except for the 30 Lincoln so there is some learning curve. I have the manuals and unfortunately our local old school anything pre 1973 mechanic who could fix anything and do it well passed away last year. I really appreciate your support. Chris

I think what you are seeing is the hard fiber disc coupling that drives the generator. It is round, about 2-1/2 inches diameter, 1/4" thick, with 4 equally spaced notches around the perimeter. It mates with two steel discs, one on the water pump, one on the generator. These discs each have 2 lugs that mesh with the holes in the fiber disc, 90 degrees apart. When assembling the water pump to the generator, you must align the lugs on the two driving discs to fit in the slots on the coupling disc. Easiest is to stick the fiber disc on to the generator drive disc with grease, then turn the shaft of the water pump so its coupling lugs line up with the open slots in the coupling disc.
You should be able to get one of these from Leland Powels or Brian Harlamoff. It would be an easy piece for a machinist to make out of hard plastic.
The space around this coupling should be packed with light grease, not using the gear oil recommended in the Lincoln books. Modern grease is fluid enough, and there is no risk of over oiling, with consequent leakage into the electrical parts of the generator.. 
The overrunning clutch mentioned in the service manual is in the front end of the generator, and it also should be packed with light grease, like Lithium base wheel bearing grease. 
I hope you are using modern square braided packing rings in the water pump, not the tarred string type referred to ij the old Lincoln service manual. Lincoln changed to the modern style 3/16" square braided packing rings in late 1928 - service bulletin May-June 1928, page 28, second paragraph in right hand column. They state 1/4" width square - I have used 3/16" "Low Friction" packing from McMaster-Carr, their part number for a 5 foot length on a spool - 9518K82. 

And is there anyone that I can send a spare to, to be overhauled?

Is that the " clutch" mentioned in the manual? If so, who sells them or what to do to replace it.

I pulled the water pump off to repack packing and am wondering what the material is and what is the part called between the pump and generator. It is disintegrated and feels like -soft bakelite or hard rubber. The Lincoln service book is rather vague and lacking pictures. Any help with part, where to get would be appreciated. Chris Pedersen 603-867-5134-