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Brilliant work there Guy! Just one part of the puzzle that I didn't quite understand; how did you solve the issue with the shaft turning the wrong way and thus unscrewing the nut, or was that solved by eliminating that arrangement all together and pressing the machined down square drive into the top hat?
Henry
The nut has gone, the function of the nut and washer was to stop the driven gear coming off the shaft when the engine stops, that's now done by the entire assembly pressing down on it. Should anything fail in service it ought to show up quickly by the rev counter stopping and it's just a case of tracking the driveline back to where it's stopped. The weak point ought to be the plastic cable drive.
Guy
Understood now Guy.
Henry
Great Henry! My only (slight) concern is a failure of the plastic part that could free a wear washer that sits between it and the bearing in the cover plate that might let it drop into the gears below. I think I'll be monitoring that for a while.
I do have one issue left to resolve - the original cover plate has a tube connected to a rubber pipe that goes to the bottom of a black canister on the back of the plenum and, assuming this is a scavenge system that vented onto the oil pump drive I need to reinstate that somewhere.
However, given that the oil pump has it's own supply I'm sure I can just feed that into the cam cover.
Unless the pipe is a vent for this area of the engine then I may need to drill through the block for it?
Can anyone enlighten me on the function of this pipe?
Guy