Toyota 17141-66020 Exhaust Manifold

To completely take out the intake manifold, one should first switch off the car power by removing the negative cable from the battery connector if at all the car has a radio system it should be activated with the correct code if it is an anti-theft system. Remove the coolant from the car and unbolt any varieties of coolant hoses associated with the intake manifold. Carbureted models need you to remove the carburetor while the fuel injected models need the air intake plenum to be removed. Then, take off the air injection pump and manifold, next, disconnect the bolt keeping the intake manifold-to-exhaust manifold bracket in place and take out the bracket. For fuel-injected models remove the fuel hose from the fuel rail. Modifications include; the removal of the heat shields at the exhaust manifold to get to the mounting nuts, removal of the power steering pump with the power steering hoses still connected, removal of the throttle valve linkage if at all it is connected and the removal of the EGR tube from the manifolds. Unbolster the nuts and bolts that connect the exhaust pipe to the exhaust manifold; use penetrating oil if needed and, if so, the oxygen sensor electrical connection as well. Last, but not least, undo the mounting bolts, nuts, and spacer to take off the manifolds from the engine. For installation, clean the mating surfaces, move such parts as may be required to the new manifold if you are replacing, place the new replacement gasket onto the cylinder head and finally fit the manifolds. Finally, you have to rotate the bolts in sequence from the center towards the ends to the required torque, replace the rest of the parts in reverse, and starts the engine for leakage check and functionality.

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.

Periodically inspect the catalytic converter-to-exhaust pipe mating flanges and bolts to ensure there are no loose bolts and no leaks between the flanges.

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