After 140K, my beloved '87 635csi is starting to consume oil. I have fixed the common external leaks, oil pressure sensor etc.,but I think it's time to remove the head for service. Question is....How difficult is the head to remove and replace with the engine in the car. I know a lot of you guys have done this procedure, so where do I start.The front of the engine where the cam drive is looks awful crowded. Should I pull the radiator?????? Thanks for all the past help,