Toyota 17140-50060 Exhaust Manifold

Disconnect the cable from the negative battery terminal, then remove the heat shields from the exhaust manifolds and disconnect the oxygen sensor wiring. Spray penetrating oil on the exhaust manifold and exhaust flange fasteners, allowing it to soak in before removing the exhaust pipe flange nuts from the exhaust manifolds. Unbolt the exhaust manifolds from the cylinder heads and carefully inspect them and the fasteners for cracks and damage. Use a scraper to eliminate all traces of old gasket material and carbon deposits from the mating surfaces of the manifolds and cylinder heads. If the gasket was leaking, check the manifolds for warpage with a precision straightedge, as they can be resurfaced by a machine shop if necessary. Position new gaskets over the cylinder head studs, install the manifolds, and thread the mounting nuts into place. Tighten the nuts to the specified torque in three or four equal steps, working from the center out. Reinstall the remaining parts in reverse order of removal, using new gaskets when connecting the exhaust pipes, and finally, run the engine to check for exhaust leaks.