OTC Rear Main Seal Installer for Ford installer is the most accurate way to ensure that the rear main seal is set to the correct depth on the crankshafeet The installer fits over the seal and with the two bolts included attaches to the engine crankshafeet By alternately tightening the bolts the seal is pulled into place quickly easily and with no damage to the rear main seal. It works on 2.0L 2.3L OHC 2.5L OHC 4-cylinder engines; 3.0L 2V 3.0L 4V 3.4L SOHC 3.8L SC V6 engines; 4.6L 2V 4.6L 4V 5.0L and 5.8L V8 engines. It is similar to Ford No. 303-178 (T82L-6701-A).