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2011 and newer 4JJ1 3.0L diesel Engine Crank Shaft Seals are Installed into the cover over the End of the Crank Shaft.?The Seal Pilots over the End of the Crank Shaft, and must be drawn evenly into position in the cover over the Crank Shaft.?The center screw of EN-50611 Threads into the End of the Crank Shaft, and pulls the Installer cover evenly against the Seal to position the Seal into the cover.