Thursday, 24 August 2017

There's always something

Having got the magneto back on, and the bike up and running properly, I went for a little ride... and it was great.

Back in the workshop, it was time to tidy up; while cleaning the oil draining trays out, I found this little chunk of cast steel:


Hmm...

Casting around for help on the AOMCC Forum, Adrie de Graff, from Holland, sent me this marked up picture of my own timing chest and suggested it was a bit of a cam follower.


This was backed up by the ever knowledgeable Nev Hunter, from Australia. I needed to investigate.

The cranked tin funnel came in handy again:


And with it all apart again, we could pull out the followers and have a proper look. This is the exhaust follower:



You can see in this picture that it is very thin around the cup:


It's a brittle fracture, with heavily discoloured material in the break. It's so thin, the case hardening would have gone right through the material. It's been like that for years.

So, Mr. John Budgen to the rescue:


I will be using the two on the left.

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