Abstract: Described is an oil filtration apparatus that includes external vanes 120 and associated outer flow passages 140 for allowing a heat exchange to occur between oil passing therein and cool air that passes by the vanes. A manually rotatable valve 154 is provided at one end of the filtration apparatus for controlling the flow of oil through the manifold. In a first position, the valve allows oil to flow through the outer flow passages through the end cap 152 and into an inner flow passage 142 where it is filtered before flowing through a central passage 134 and out the flow manifold. In a second position, the outer flow passages are blocked so that oil flows directly into the inner flow passage. A pressure sensitive valve 164 is provided in the end cap so that when the filter becomes clogged, oil is diverted directly to the central flow passage bypassing the filter.

Abstract: A method of reinforcing threads. Firstly, provide a workpiece. Secondly, determine the position on the workpiece that a hole is to be drilled and into which threads are to be tapped. Thirdly, bore an opening in the workpiece which transversely intersects the hole. The opening must have a diameter which is greater that a diameter of the hole. Fourthly, insert an insert into the opening in interference fit relation. The insert is of a harder material than the workpiece. Fifthly, bore the hole through the workpiece and into the insert. Sixthly, tap threads in the hole, such that a portion of the threads are reinforced by virtue of being tapped into the harder material of the insert.