DoItYourself.com offers step-by-step instructions on how to repair an exhaust manifold leak, while YourMechanic.com provides a short list of steps that a mechanic follows when fixing a leak in the exhaust manifold. The main steps are checking the leak, removing the bolts and manifold, and replacing the gasket and manifold.
It is important to check the engine for any additional leaks and to find out exactly where the leak is coming from in the exhaust manifold. To remove the manifold, unscrew the bolts, holding it in place using a wrench, and pull the manifold away from the car. If the gasket is the part that is leaking, remove the gasket, and replace it with a new one; then, put the manifold back on the car.