Toyota 17150-20010 Left Exhaust Manifold Sub-Assembly

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Disconnect the negative cable from the battery. Unplug the oxygen sensor wire harness and the clamp over the harness. If you're installing a new exhaust manifold, remove the sensor. Remove the upper heat insulator from the manifold by removing the exhaust manifold heat insulator bolts. Apply penetrating oil to the exhaust manifold mounting nuts/bolts. Disconnect the exhaust pipe from the exhaust manifold. Remove the exhaust manifold brace (some models have two braces) and lower heat insulator by unbolting the exhaust manifold flange brace near the front engine mount. Remove the nuts/bolts and detach the manifold and gasket by removing the exhaust manifold fasteners at the cylinder head. Use a scraper to remove all traces of old gasket material and carbon deposits from the manifold and cylinder head mating surfaces. If the gasket was leaking, have the manifold checked for warpage at an automotive machine shop and resurfaced if necessary. Position a new gasket over the cylinder head studs. The marks on the gasket should face out (away from the head) and the arrow should point toward the rear (transaxle end) of the engine. Install the manifold and thread the mounting nuts/bolts into place. Working from the center out, tighten the nuts/bolts. Reinstall the remaining parts in the reverse order of removal. Run the engine and check for exhaust leaks.

Disconnect the negative cable from the battery. Spray penetrating oil on the exhaust manifold fasteners and allow it to soak in. Remove the heated oxygen sensors from the front and rear manifolds. Remove the EGR pipe from the rear exhaust manifold and cylinder head. Remove the nuts retaining the exhaust pipes to the front and rear exhaust manifolds. Disconnect the electrical connector from the oxygen sensor at each manifold. Unbolt the exhaust manifolds from the cylinder heads and slip them off the mounting studs. Carefully inspect the manifolds and fasteners for cracks and damage. Use a scraper to remove all traces of old gasket material and carbon deposits from the manifolds and cylinder head mating surfaces. If the gasket was leaking, check the manifolds for warpage on the cylinder head mounting surface by placing a straightedge over the surface and trying to insert a feeler gauge. If the clearance exceeds the limit, have the manifold resurfaced at an automotive machine shop. Position new gaskets over the cylinder head studs. Install the manifolds and thread the mounting nuts into place. Working from the center out, tighten the nuts. Reinstall the remaining parts in the reverse order of removal. Use new gaskets when connecting the exhaust pipes. Run the engine and check for exhaust leaks.

It is important to check the catalytic converter for leaks, corrosion, dents, and other damage whenever the vehicle is raised for servicing of underbody components.

The next components to be removed are the nuts retaining the exhaust pipes to the front and rear exhaust manifolds. Additionally, on the front manifold, two bolts securing the manifold support bracket are removed.

Penetrating oil.

Be sure to spray the nuts on the exhaust flange studs before removing them from the catalytic converter.

After checking for warpage, position new gaskets over the cylinder head studs. Then, install the exhaust manifolds and thread the mounting nuts into place. When tightening the nuts, work from the center out.

Unbolt them and remove them from the engine.

A catalytic converter is an emission control device that reduces pollutants in the exhaust gas stream.