Rear main oil seal — replacement Ford F150
Note: Rear main oil seal replacement is a time-consuming job requiring several special tools; read through the procedure and obtain the necessary tools before beginning.
1. Disconnect the cable from the negative battery terminal (see Intake manifold – removal and installation).
2. Raise the vehicle and support it securely on jackstands.
3. Remove the transmission (see Automatic transmission).
4. Remove the flywheel/driveplate (see Flywheel/driveplate – removal and installation).
5. Remove the toothed-wheel (used by the CKP sensor) between the crankshaft and driveplate.
6. Use a special tool and remove the rear main oil seal from the retainer.
Caution: To prevent an oil leak after the new seal is installed, be very careful not to scratch or otherwise damage the crankshaft sealing surface or the bore in the engine block.
i.7 Inspect the seal contact surface on the crankshaft for signs of excessive wear or grooves (seal retainer removed for clarity — typical engine shown)
7. Clean the crankshaft and seal bore in the retainer thoroughly and de-grease these areas with brake system cleaner. Check the seal contact surface on the crankshaft very carefully for scratches or nicks that could damage the new seal lip and cause oil leaks (see illustration). Lubricate the lip of the new seal and the outer diameter of the crankshaft with engine oil. Make sure the edges of the new oil seal are not rolled over.
8. Position the new seal onto the crankshaft. Use a special rear main oil seal installation tool to drive the seal in place. Make sure the seal is not off-set; it must be flush along the entire circumference of the seal retainer. An alternative method is to remove the seal retainer plate, and replace the seal on the bench, then apply a new gasket and RTV to the seal retainer plate and install it within five minutes of applying the RTV.
Caution: When installing the new seal, if so marked, the words THIS SIDE OUT on the seal must face out, toward the rear of the engine.
9. Use a special tool and install the crankshaft rear oil slinger.
10. The remainder of installation is the reverse of removal.