Mercury F5TZ-6701-A Crankshaft Oil Seal Assembly

Disconnect the negative battery cable and remove the drive belt. Next, remove the bolt from the center of the crankshaft pulley, ensuring the crankshaft does not turn by preventing it with a large screwdriver wedged between the teeth of the starter ring gear against the transmission housing, or by using an extension through one of the holes in the crankshaft pulley against the block, or a strap-type wrench around the pulley. Use a puller designed to apply force to the pulley hub only, avoiding any that grip the outer edge to prevent damage. Clean the crankshaft nose and seal contact surface with lacquer thinner or acetone, leaving the Woodruff key in place. Examine the seal contact area for excessive wear or scoring, and consider using a repair sleeve if necessary. The crankshaft front oil seal can be removed with a special tool or a carefully taped screwdriver, taking care not to damage the timing chain cover or the crankshaft. If the engine has high mileage, apply penetrating oil to the seal-to-cover joint before removal. Position the new seal in the bore with the open end facing inward, applying a small amount of oil to the outer edge for easier installation. The seal can be reinstalled using a special tool or by driving it into the bore with a large socket and hammer until fully seated and square to the cover. Lubricate the oil seal contact surface of the crankshaft pulley hub with multi-purpose grease or clean engine oil, then install the pulley, ensuring the keyway aligns with the Woodruff key. Apply a small amount of RTV sealant to the Woodruff key groove before installation. Use a special pulley installation tool or a large washer over the bolt to press the pulley into place, tightening the bolt to the specified torque without using a hammer. Complete the remaining installation steps in reverse order, then add coolant, check the oil level, and run the engine to check for leaks.

Lubricate the oil seal with clean engine oil and press the seal into the retainer using Rear Seal Replacer TBST-6701-A or equivalent.

Position the seal in the bore with its open end facing IN and drive it in with a seal driver until it is securely seated. Use a socket or piece of pipe the same diameter as the seal if a seal driver isn't available.

Remove the transmission, and clutch assembly.

The seal installation can be performed more easily by unbolting and removing the seal retainer plate. Remove all the mounting bolts, then use two of the retainer-to-oil pan bolts and start them into the two threaded holes in the retainer plate. Tightening these two bolts alternately will push the retainer from the engine. Remove all traces of RTV sealant and apply a 3/16-inch bead of RTV where the block and oil pan flanges meet.

The new seal should be positioned onto the crankshaft, ensuring that if marked, the words "THIS SIDE OUT" face out toward the rear of the engine.

The first step is to disconnect the cable from the negative battery terminal.

The lip of the new seal and the outer diameter of the crankshaft should be lubricated with engine oil. Make sure the edges of the new oil seal are not rolled over.

The remainder of the installation is the reverse of removal.

With a sharp awl or similar tool, punch two holes in the seal on opposite sides just above the point where the main bearing cap meets the cylinder block.

Thread a sheet metal screw into each hole. Pry against the sheet metal screws with two large screwdrivers or small pry bars to remove the seal. If you need a fulcrum to pry against, use two small blocks of wood.

Remove the drivebelts and the crankshaft pulley.

A thin (but durable) two-inch wide plastic strip or a two-liter plastic beverage bottle cut to size can be used around the inside circumference of the seal.

F5TZ6701A IS THE REAR CRANKSHAFT SEAL, 5H2Z6700AA IS THE FRONT CRANKSHAFT SEAL