The areas around the mounting holes on a sheet metal rocker cover are dished from having fasteners overtightened. To prevent oil leaks when the rocker cover is installed, the technician should:

A. Replace the rocker cover with a new one.
B. Hammer the dished areas flat again.
C. Use two gaskets instead of one.
D. Use RTV sealant instead of a gasket.

To prevent oil leaks when installing a rocker cover with dished areas, the tech can replace the rocker cover, hammer the dished areas flat, use two gaskets, or use RTV sealant instead of a gasket.

Explanation:

If the areas around the mounting holes on a sheet metal rocker cover are dished from having fasteners overtightened, there are a few steps the tech can take to prevent oil leaks when installing the rocker cover. The first option is to replace the rocker cover with a new one. This ensures that the dished areas are no longer a problem. Another option is to hammer the dished areas flat again.

This requires carefully reshaping the metal back to its original form. Using two gaskets instead of one is also a solution. The additional gasket creates a tighter seal and compensates for the dished areas. Lastly, the tech can choose to use RTV sealant instead of a gasket. RTV sealant is a silicone-based adhesive that can create a reliable seal even on imperfect surfaces.