Question about how the intake cams and valves work on the N16 engine. Our new-to-us and first 2012 MINI Countryman with 100k miles on it failed (burned cylinder #4 exhaust valve) at 101k miles, and I have been slowly tearing it down and repairing it over the past few weeks. I have the head on my workbench, and I noticed when I turn the intake cam, only one intake valve per cylinder opens/closes. The other one in each cylinder does not move. Is that normal operation, or has something failed in that complex intake mechanism? I have looked all over youtube and on this site for an explanation and/or video of the intake operation for this engine. Any guidance on this would be appreciated. Paul

PS I first posted this question in the MINI Countryman (2010 +) > R60/R61 Stock Problems/Issues forum, but received no replies. If it is a problem to have it in both places, I will delete the other one.

 

The valves operate in pairs per cylinder. The cam lobes press on the followers which in turn press on the valves. In the intake assembly of N12, N16 and N18, there is an intermediate shaft with intermediate followers. Make sure all of them are present.

In a instance where you have bent valves, the valves might be stuck or barely move.

 

Thanks. It appears all the components are there and moving properly. It is just that as I turn the intake cam, the valves in each cylinder do not move open at the same rate or for the same amount of lift. Each cylinder is the same... one valve opens a bit, and the other valve opens just a little. I guess I will put it all back together in the next few days and see how it operates. Thanks again. Paul