47UL Build April 21st Edition

Been skipping about working on different aspects of the bike and some other things

Put the top end together and got it mounted on the cases. The top end isn’t New, the cylinders and pistons are ones I had been using on my personal ‘37ULH for a couple of years, maybe 5000 miles on it. Everything was still in good shape, pistons and bores were looking good, almost no wear, (an additional .002” thou clearance over original install clearances, just nicely broken in) Touched up the valves with some compound, wire brushed off accumulated carbon and put it back together.

PIstons just lightly scuffed, scuff marks vertical, not on an angle, showing that rods are running true in bores, not twisted or bent.

Getting ready to do up the valves. The orange “O” rings are going to be the seals between the top spring cover and valve guide. The big one outside, and the smaller one inside, sandwiched in place between the spring spacer and the cover. They are Viton, tried Buna, but they couldn’t take the heat. The valve covers are new, I also use “O” rngs at each joint of the cover. Also, the section with the “Flats machine on them got an internal groove machined at the top so that the O ring could be recessed somewhat and the cover slide up and down more easily. functionally the same setup as the “K model” covers.

You can just see the Viton O ring at top of cover

Here you can see the O ring at the threaded joint. There is also one at the base of this cover.

The Jug going on. Some of you may ask “What’s with the pliers”? Simple the rubber covered handles support the piston as I’m sliding the jug over the rings. The rubber on the handles protects the piston and the case mouth/gasket. I’ve tried pieces of wood, whatever, but these work the nicest. The ring compressor I picked up at a yard sale a couple of years ago. Has a quick latch on the screw thread and opens completely to come off around the rod when finished. Cool Tool.

Also notice the “K”/OHV size intake nipple. It’s brazed in place.

Jugs on, lookin’ like a motor!

Send the children out of the room, got a picture of a nice set of Jugs here!

In case the big F didn’t give it away, this is the front cylinder! These jugs were new “Indian sub continent” jugs that I got through Paul Freibus. He reworked them, installing the large nipples, the oversize intake valve and polishing the ports.

As I mentioned earlier these jugs aren’t new, they were on my personal bike for a couple of years. I’d like to say they were always gently used, and never used in anger, but, well, REally? Mostly I do just put about, but If you get a chance to blow smoke in a Dresser’s face from time to time, who wouldn’t?

I only pulled these cylinders off when I got my new, experimental all Aluminum jugs from Enfield Racing. I had been pestering Bruce Argetsinger for years to let me test some prototypes, so when I got them, these came off. The bores on these cylinders are .010” over 3 7/16”. After Paul did the brazing of the inlet nipples, he rebored the cylinders in case the jugs had warped any with all the heating, etc.

Here’s a sight to make any Big Twin Flathead lover Drool!

Here’s the ‘47UL on the left, just having been assembled, and My Personal 37ULH, which I assembled a week or so ago. Just had to take the picture, may never see this again in my shop.

Here’s 172 CU IN of antique horse power! about equal to a hot Evo motor :-( Classy though! The heads aren’t done for the 47UL, have to do some machine work on the mill to accommodate the larger intake valves. Soon.