Toyota 17150-0P040 Left Exhaust Manifold Sub-Assembly

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Disconnect the negative cable from the battery. Raise the front of the vehicle and support it securely on jackstands. Working below the vehicle, remove the lower splash shields. Apply penetrating oil to the bolts and springs retaining the exhaust pipe to the manifold. After the bolts have soaked, remove the bolts retaining the exhaust pipe to the manifold. Separate the front exhaust pipe from the manifold, being careful not to damage the oxygen sensor. Unbolt the lower exhaust manifold braces and remove them from the engine. Also, disconnect the oxygen sensor connectors. Working in the engine compartment, remove the upper heat shield from the manifold. Remove the nuts/bolts and detach the manifold and gasket. Installation: 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 shows signs of leaking, check the manifold for warpage with a straight edge. If the manifold is warped, it must be replaced. Position a new gasket over the cylinder head studs, noting any directional marks or arrows on the gasket that may be present. Install the manifold and thread the mounting nuts 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.

For manifold reinstallation:Install the manifold and thread the mounting nuts into place.Tighten the nuts or bolts in three or four equal steps, working from the center out.

The first step is to disconnect the negative cable from the battery. Additionally, it's recommended to spray penetrating oil on the exhaust manifold fasteners and allow it to soak in.

Evenly loosen the nuts.

Tighten them a little at a time, working from the center nuts outward, to the torque.

Emissions-related components such as the catalytic converter.

Check with a dealer service department.

The initial steps before removing the exhaust manifold are as follows:Disconnect the cable from the negative battery terminal.Raise the front of the vehicle and securely support it on jackstands.Remove the lower splash shields.