Repairing Oil Leaks

Once the origin of the leak has been pinpointed and traced back to its source, the cause of the leak must be determined in order for it to be repaired properly. If a gasket is replaced, but the sealing surface is damaged, the new gasket will not repair the leak, the surface must be repaired or replaced. Before attempting to repair a leak, be sure that the gasket and sealing surfaces are correct.

Perform the following steps in order to check for gasket leaks:
1. Inspect the fluid level/pressure is too high.
2. Check the crankcase ventilation system for restrictions or malfunctioning components.
3. Inspect for improperly tightened fasteners or dirty/damaged threads.
4. Look for warped flanges or sealing surfaces.
5. Check for scratches, burrs or other damage to the sealing surface.
6. Look for a damaged or worn gasket.
7. Check for cracking or porosity of the component.
8. Check for use of an improper sealant used (where applicable).

Perform the following steps in order to check for seal leaks:
1. Inspect the fluid level/pressure is too high.
2. Check the crankcase ventilation system for restrictions or malfunctioning components.
3. Check for a damaged O-ring seal bore (scratched, burred or nicked).
4. Look for a damaged or worn oil seal.
5. Check for improper component installation.
6. Check the component for cracks or damage.
7. Inspect shaft surface for scratches, nicks or damage.
8. Check for loose or worn bearing which may lead to premature oil seal wear.