Toyota 17120-50020 Manifold, Intake

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The upper intake manifold, referred to by Toyota as the intake air surge tank, requires the disconnection of the negative battery terminal, removal of the engine cover, and the air intake duct along with the air filter housing. Next, coolant hoses from the throttle body should be clamped off and disconnected, followed by the disconnection of the EVAP system fuel vapor feed hose, ventilation hose, and throttle body wiring. Two Vacuum Switching Valve electrical connectors need to be disconnected, and the throttle body bracket bolts should be removed to take off the bracket. The baffle plate must be removed, along with both bolts from each intake manifold support bracket, which Toyota calls surge tank stays, before removing the two intake manifold mounting nuts and four mounting bolts to detach the upper intake manifold. The condition of the upper intake manifold gasket should be checked, replacing it if necessary, and installation follows the reverse order of removal, ensuring that the mounting bolts and nuts are tightened to the specified torque. For the lower intake manifold, known as the intake manifold by Toyota, the upper intake manifold must first be removed. If replacing the lower intake manifold, the fuel rail should be removed; however, if only replacing gaskets, disconnecting the fuel supply and return line connections is sufficient. The lower intake manifold bolts should be removed to detach the manifold, and old gaskets must be discarded while cleaning the mating surfaces thoroughly. Installation is again the reverse of removal, using new gaskets and ensuring the bolts are tightened to the specified torque.

Regarding the 2UZ-FE engines, it is recommended to start with the following operations, turning on the ignition and relieving the fuel system pressure and disconnecting the cable of the negative terminal of the battery. Depending on your vehicle, the upper intake manifold comes off after the throttle body is detached, and after this, label and disconnect any wires, hoses and brackets that are connected to the throttle body. Set the mounting bolt for the EVAP vacuum switching valve aside, then loosen the intake manifold fasteners by turning them on and off around evenly and at last, disconnect the upper intake manifold with the lower intake manifold, but if doing so, do not apply any force between gasket surfaces. If getting to the other parts, the upper intake manifold does not have to be removed from the lower one, and the throttle body does not have to be disconnected as well if the coolant hoses are clamped off. Subsequently, disconnect all the wires, hoses and brackets from the lower intake manifold, the fuel rail and injectors have to be removed and identified, and the lower intake manifold has to be unbolted from the cylinder heads, starting from outermost bolts to avoid damages. For 1UR-FE, 3UR-FE, and 3UR-FBE engines the following components have to be detached, the engine cover, the windshield wiper motor and the linkage, cowl panel bolts, and the cooling system should be drained; besides, the air intake duct and the throttle body should be removed. Bolt, label, and remove all the wires, hoses, and brackets from the intake manifold, all water bypass hoses, and fuel rail insulators also need to be removed. Remove the intake manifold from the cylinder heads in the same manner as the bolts; outer nuts first before the inner ones. For the installation on 2UZ-FE engines, first, remove all the old gasket materials from the intake manifolds and cylinder heads, and then new gaskets must be put in their place, put the lower intake manifold into its place correctly and finally, tighten the fasteners in m stages to the desired torque of 11 N-m. Place a new gasket and the upper intake manifold with torque in same way, then put the rest of the parts back in the reverse way. Moreover, look for the coolant level, start the engine and look for any sign of leakage. Regarding 1UR-FE, 3UR-FE, and 3UR-FBE engines, remove old gasket pieces, put the new gaskets in their place, set the intake manifold, fasten its bolts with lsd tightening indications, and reinstall all the remaining parts and the liquid to fill in the cooling system and check for leakage.

Disconnect the (EVAP system) fuel vapor feed hose and the ventilation hose. Also, disconnect the throttle body wiring.

The upper intake manifold can remain attached to the lower manifold, and the throttle body can remain attached as well, but the coolant hoses must be clamped off and disconnected from it.

1. Remove all traces of old gasket material and sealant from the upper and lower intake manifolds and cylinder heads, then clean the mating surfaces with brake system cleaner. 2. Install new gaskets. Position the lower intake manifold on the engine and install the fasteners. 3. Tighten the fasteners in three or four equal steps to the specific torque, working from the center outwards to avoid warping. 4. Install a new gasket and the upper intake manifold onto the lower intake manifold. Install the nuts and bolts and tighten them in three or four equal steps to the specific torque. 5. Install the remaining parts in the reverse order of removal. 6. Check the coolant level. Run the engine and check for fuel, vacuum, and coolant leaks around the throttle body hoses.

Installation is the reverse of removal. Be sure to tighten the upper intake manifold mounting bolts and nuts to the specified torque.