I (okay, WE) have a '90 300 SEL with 215k miles - but we bought it a few years ago at about 170k miles. So far, it has been extremely reliable. It's time for a couple of repairs and I'd appreciate help on one of them.

Very noisy lifter. I haven't found the specific culprit, but it seems to be just one. I've already ordered two new ones. As usual, the CD is worthless. I know it can be done without removing the camshaft or anything much beyond removal of the valve cover. Can someone give a few pointers about turning the rocker, or removing it, or exactly what's involved?