Locking the flywheel, looks like a BL inlet valve to me.

2 minutes ago, sepulchrave said:

Locking the flywheel, looks like a BL inlet valve to me.

 

I thought it must be that. I just use a screwdriver wedged in the pressure plate. I guess the valve would be useful if you were removing the flywheel to do the crank oil seal or whatever.

It goes in either of the top two g-box bolt holes & acts as a stopper on the ring-gear so you can easily undo/do-up the clutch pressure plate bolts. Multi use tool, fits any manual vehicle ;-)

 

Shim.

27 minutes ago, sepulchrave said:

Locking the flywheel, looks like a BL inlet valve to me.

From one of Mr Chapmans joint ventures into making a Ford Cortina MK1 & Mk2 go fast........Had a green stripe........My misspent yoof!

 

Shim.