FH - dynamo chain

 In 60 stolen minutes (home early from a turn on the railway) I had an opportunity to do something on the Huntmaster. My initial thought was to set up the tappets and I had a look at the tappet cover locating pins to see what was going on with the inlet side, which doesn't fit. This job was going nowhere without a bit more time so I looked for something else to do and settled upon the dynamo chain. 

I removed the dynamo driving sprocket successfully with a small puller but I couldn't remove the driven sprocket at all; however, that was enough to allow me to put the new chain on.

For the record the cork gasket behind the driving sprocket is definitely there:

The new chain looked a bit larger in width than the one that was originally fitted; I've kept the old one just in case. The new one went on without any problems followed by the driving sprocket with a new tab washer - folded up here again for the record:

I'm a bit puzzled about the driven sprocket, which is a castle nut and has a hole for a split pin in the shaft. However, the slots in the castle nut don't fall in alignment with the hole due to the width of the sprocket and since it is fitted with a tab washer per the parts list, this is obviously correct. The tap washer is bent up correctly:

I really ran out of time to put the timing cover back on, but we'll do that tomorrow.

In the meantime, there's a curious little puddle underneath the oil filter - perhaps it's loose. Another little problem to take a look at!