Toyota 17141-66020 Exhaust Manifold

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Before removing the exhaust manifold, you have to first undo the negative terminal of your car battery along with the activation code of any car stereo system immobilizer. If this is provided, then the pipes and the valve assembly that is installed around the cylinder head and the exhaust manifold should be detached. Next, remove the upper heat insulator that is fastened to the exhaust manifold by bolts, The bolts are located at the upper heat insulator that is fastened to the exhaust manifold. After that, apply penetrating oil on the exhaust manifold mounting nuts and the nuts connecting the exhaust pipe to the manifold and having soaked, one would then remove them. To do this disconnect the manifold and gasket by unscrewing some nuts. To install remove all the old gasket material and carbon deposits using a scraper from the face of the manifold and cylinder head. In case there was a gasket leak, then it is advisable that the manifold is examined for warpage and if found, it should be resurfaced. Place a new gasket over the cylinder head studs so as the mark are on the outside, put the manifold and screw the mounting nuts on. Gradually, and with equal increments, turn the nuts from the center out to the recommended torque. Last, replace the rest of the parts in reverse manner than they were removed and start the engine in order to examine exhaust bov leaks.

Remove the heat shields from the exhaust manifold to gain access to the mounting nuts by removing the heat shield mounting bolts.

The three-way catalyst system is designed to reduce hydrocarbon, carbon monoxide, and oxides of nitrogen emissions by oxidizing and reducing these chemicals, converting them into harmless nitrogen, carbon dioxide, and water.