Crankshaft sealing rings

Replacing the front o-ring

Remove the ground wire from the battery. Loosen the lower mounting bolts, unscrew the upper tension bolt of the generator. Tilt the alternator towards the engine and remove the drive belt.

Raise the front of the car and secure it on stands.

Loosen the lower mounting bolts, unscrew the upper tension bolt of the generator. Tilt the alternator towards the engine and remove the drive belt.

Remove the auxiliary drive belt pulley from the crankshaft, toothed belt cover, toothed belt and crankshaft toothed pulley, key and axial ring.

Using Ford Special Tool #21-096, remove the crankshaft front O-ring (see fig. 2B.53).



Clean the oil pump housing and crankshaft. then lubricate the lips of the new O-ring and the front of the crankshaft with clean engine oil. Install a new O-ring using Ford Special Tool No. 21-093A or with an adapter sleeve and auxiliary drive belt pulley bolt. Check that the crankshaft is at the TDC position of the No. 1 cylinder on the compression stroke, and install the key, axle ring and toothed pulley. Install the toothed belt and adjust its tension, then install the toothed belt cover and auxiliary crankshaft drive belt pulley.


Install and adjust the tension of the auxiliary drive belt.

Lower the car and connect the battery.

Replacing the rear o-ring

The rear O-ring can be replaced with the engine removed from the vehicle or after the transmission has been removed.

Remove flywheel.

Using Ford Special Tool No. 21-151 or an appropriate tool, remove the rear O-ring from its seat. If the seal is away from the back of the motor, the o-ring can be removed as described below.

Clean seal seat, rear of crankshaft, and flywheel mating surfaces. Depending on the tools available, one of two methods may be used to install the O-ring. If special tool Ford No. 21-095 is available, lubricate seal lips and mating surface on crankshaft with clean engine oil. Install the O-ring in the special tool, and install it into the seat using the two flywheel mounting bolts.

Otherwise, remove the O-ring cover by first removing the oil pan and unscrewing the cover.

Use a screwdriver blade to remove the old o-ring from the cap (see fig. 2B.54).



Clean the mating surfaces of the seal cover, crankcase and oil pan. Insert a new O-ring into the cap. New gaskets must be used when installing the cover and oil pan.

Lubricate the mating surface on the crankshaft and the sealing lips with clean engine oil. Fit a new gasket to the back of the crankcase, and install the seal cover and gasket. Screw on the seal cover with bolts, tightening them to the required torque.

Install the oil pan. Install the flywheel. Install the clutch. Install the gearbox.