That is the only unsolved problem in my journey - but I found a solution: To get the timing cover off, you have to remove the cam-covers (btw.: to remove all those wiring X-mas trees from the cam covers without breaking the X-mas-tree-fasteners, I heat them up with a heat-gun first). Back to the problem: The oil-stick-tube is fitted onto one of those cam-cover bolds, and this bolt remains non-accessible with that tube still in place. I could not move the tube out of the way. I cut a little slot