The Exhaust Manifold of Nissan Sentra collects exhaust gases from the cylinder head outlets and merges them into a single passage that connects to the exhaust pipe. The Exhaust Manifold is bolted onto the head and pipe, with gaskets at both points to seal pressure and heat. Many Nissan versions mainly use sturdy cast iron; however, some rely on a less common method that uses a welded steel or stainless steel tube attached to a flange for the same purpose. Certain Nissan Sentra assemblies include a heat shield that minimizes heat transfer to adjacent components or the cabin floor. Furthermore, heat shields may integrate a catalytic converter or provide a threaded port for an oxygen sensor. The design of the Exhaust Manifold ensures that the flow is directed to the catalytic converter, muffler, and tailpipe. It also suppresses back-pressure that could otherwise push spent gases towards the intake. This is helpful for Sentra engine efficiency. Continuous thermal expansion can eventually crack the Exhaust Manifold. A cracked manifold can upset the air-fuel mix or allow fumes to enter the cabin. Hence, responsible Exhaust Manifold operation is necessary for every Nissan Sentra.
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