FH - Engine breather

 The engine breather on the FH is similar to that on the BSA A10 & A7 and is comprised of a timed vent driven by the idler wheel in the timing chest, ported through the crankcase joint behind the camshaft space to an outlet ahead of the gearbox sprocket.  There’s a little copper pipe which arrived like this:

It’s not supposed to look like that. It’s supposed to be like this:

In the days before the FERC arrived, this pipe was led to a gap in the alloy arc cast on the back of the primary case to protect the gearbox sprocket, so anything coming from the breather lubricated the chain. When the FERC arrived, the breather pipe didn’t change as far as I can tell but as you can see it can’t get to the gearbox sprocket any more.

We’ll direct it downwards.

First step is to anneal it by heating it cherry red and quenching in water:

I want a bend, just less than 90° to direct the gases downwards. I use the little pipe bender to make a tidy job of that:

I added a bit of 8 mm fuel pipe to a level fractionally below the lower frame rail. 

That will do nicely.