Cheap fix

Since the Mark III engine was stuck, my fear was that the cylinder had been flooded with water and was a complete rust-disaster. At least the air filter was full of water...

Guess what, the rust was not that bad even if it is very worn and has some damages, it probably could be made to work. Only had to spray with penetrating oil and wait a couple of minutes to free the piston.

After some light grinding with 400 grit wet sand paper soaked with WD-40 (oil), the damages are clearly visible.

Annealed copper cylinder head gasket lightly sanded.

Amal 225/3

The carb for the Mark III is like no Amal I've seen before.
Wonder if it's possible to get spares if needed?
At least a visual inspection shows that the tickler is missing.

Newsflash

Got me another JAP engine project too as well as the Howard GEM Rotavator ( rototiller) it is attached to. The engine is a 600cc s.v. Mark III Type 5

Engine number is:
UCZ/Z
94433\5

If I'm correct that would be:
U = 600cc Side Valve Engine, 85.7 x 104mm bore and stroke
C = Sports Engine
Z = Dry sump Lubrication
Z = 1933 Model Year

U is a standrd 6hp (4½ hp nominal) engine, according to The JAP book so what with the C marking?

The JAP Engine Reference there are more alternatives and the Mark III engine is recognized as a Sports engine.

My hopes were that I could get it started. By lubricating with the famous Omega Omicron  636 penetrating oil. So far I have got the valve lifter, throttle and most other leavers and functions to work.

Unfortunately the next step is to dismantle the cylinder head to see how bad the cylinder and piston is since the engine is stuck.

Inspiration

Found a bunch of pictures on another blog. Obvious staged, the same chain-less Excelsior appear on many of the pictures with different drivers.

All together

Small step

Made some progress with the valves. Unfortunately I have a house and a garden and it's spring time and ...

Anyway, managed to mill the holes in the valve stems and cut them to the appropriate lengt. Since I do not have any valve grinding machine I will have to make a jig to grind the end of the valve stems. Hopefully this weekend (as long as the weather is rainy I can't do any outdoor painting).