The transitional engine eccentric bracket supports the pivot for a bellcrank midway along the pushrod.
This is the part in question, machined from mild steel with phosphor bronze inserts.
As you can see, there were a number of machining operations on the milling machine to get to this final part.
This started with a rectangular block of mild steel that I machined a step into and then machined the rounded outside ends. The slot in which the bellcrank sits was machined next, but only after cross-drilling and fitting a phosphor bronze bearing.
I’ve not shown the stages and machining operations, but this has taken me a long time to machine.
offering the part up to the crankcase long view of the engine and alignment to the eccentric I did think about fixing it the other side of the crankcase
All of the options required me to first disassemble the engine.
After machining a slot in the crankcase I then silver soldered the bracket to it. There really was no going back now as I’ve spent a lot of weekends making these two parts. As much as anything I was nervous about warping the crankcase with the heat and possible surface damage.
I silver soldered using a blow torch and my trusty homemade hearth.
Luckily the silver soldering worked fine and I now have a solid bracket and pivot point for the bellcrank.
Transitional engine eccentric bracket in place and the engine reassembled.
I’m very pleased with the overall looking. Although, I probably could have finished the bracket closer to the pivot point and then had the bellcrank sticking out.