I found the diagram in section 18-005 of the engine manual. The oil supply for the cam oiler tube is through the rear camshaft bearing (on both sides of the engine). All other cam bearings are lubricated by oil flowing through the camshaft oiler pipe. The plastic fittings that hold the oiler pipe supply lube to the cam bearings. Unless damaged, the oiler pipe should be able to be cleaned out. Replace the plastic fittings (I got these from the dealer for around $6 per set). Cleaning the varnish and crud from the pipe will make installation of the new plastic fittings easier.

If you have lost lubrication to the cam lobes and bearings, it would be wise to remove the camshaft and check the journals for damage. When going back together, the oiler can be checked by running the engine briefly with the valve cover off and seeing that all the cam lobes have oil squirting on them. This is a messy procedure, however, so be forewarned and run the engine only as long as needed to see that the oiler is doing its job.

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Erich Loepke
2010 Ford Focus
Currently Benz-less