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Replace the valve cover gasket if the valve cover gaskets are
leaking or if they're worn. The procedure is as follows:-- 1)First of all let the motor cool down if the car was recently driven. Then remove the air
intake boot.The air intake boot ios attached to the engine's throttle body. 2)Carefully disconnect the throttle
cable , hoses and electrical connectors located on the upper intake manifold. 3)Then disconnect the hard pipe that is
connected to the EGR (exhaust gas recirculation) valve. 4)The EGR valve is located beneath the upper intake manifold. 5)Then remove the bolts from both the upper intake manifold and the manifold
support bracket. 6)Now the upper intake main fold and
lower intake manifold both have got loose as you removed the nut. 7)After that remove the upper intake
manifold from the lower intake manifold. Carefully place clean rags over the
intake runners to prevent anything from falling into the intake system. 8)Then you will have to disconnect the
crank case breather valve on the valve cover. 9)Then remove the bolts from the valve
cover and remove the reinforcing straps. 10)Then remove the camshaft belt cover
and the dust shield from the back of the camshaft sprocket. 11)Now carefully remove the valve cover.
Properly clean the old gasket material with gasket remover. 12)You can install a new gasket in the reverse procedure of removal.
if it is a 3.8liter engine generally about and hour there is 4 10mm bolts in the front valve cover and the rear you may have it remove the spark plug wires and coilpack/ignition controll module bracket.
Allow the car to cool. Disconnect the battery terminal. Remove the right side vent screen top extension. Disconnect the ignition coil with power transistor and its wiring and brackets.
Disconnect the left hand side coil wires and spark plug wires. Remove the spark plug wires, valve cover bolts and the valve cover. Unplug the electrical connections from the intake manifold runner control actuator. Unfasten the actuator retaining the screws, right bank heated oxygen sensor front and rear.
Remove the heated positive crankcase ventilation (PCV) valve. Remove the heated oxygen sensor plug and the Differential Pressure Feedback EGR (DPFE) sensor. Disconnect the ignition coil with power transistor and its wiring and bracket. Remove the valve cover bolts, the valve cover and the old valve cover gasket. Clean the valve cover seating area with automotive engine cleaner and place the new gasket in the gasket seating area.
Replace the parts that were removed and disconnected by reversing the steps. Replace the valve cover gasket and tighten the bolts, in sequence, ensuring not to over tighten. Put back the ignition coil with power transistor and its wiring and bracket, the heated positive crankcase ventilation (PCV) valve, the heated oxygen sensor plug and the Differential Pressure Feedback EGR (DPFE) sensor.
Add oil to the car. Start the car and let it run at idle for a while to check for leaks..
the thermostat its located in water out hose near to a/c compressor, to change valve cover, front of engine remove the plastic cover with lexus logo using hex 5mm key 2 bolts , unplug 3 spark plug wires ,loose all 10mm bolts on valve cover , to rear engine valve cover remove before the manifold intake and all components , air filter duct , etc.
They are under the black plastic cover that is in the middle of your valve cover gasket. Remove the intake hose from the aluminum intake plenum on top of the valve cover and the silencer box against the firewall. Remove all the connectors from the sensors which should be 2 on the plenum and the 2 large vacuum hoses on the plenum. Then remove the 3 12mm bolts from the plenum at the throttle body and remove the plenum. You can reuse the throttle body gasket at the plenum so don't destroy it. All the other bolts are 10mm and use a screwdriver to loosen the clamps on the hose. The sensors have clips that you need to remove with a small screwdriver, then disconnect them. Remove the bolts on the cover and the cover. Then remove the bolts holding the coil packs down. Do one plug at a time. 2 of them are connected to the 2 plug wires and 2 are underneath the 2 coil packs. The connectors on the coil packs are fragile so remove them carefully. Reverse the steps to reinstall the plenum, etc.
The first step is to remove all the parts that are in the way of you being able to remove the valve covers. (Ex.: air intake, loose wires etc.) Then you will need to remove your valve covers (using basic tools) and be very careful to not let anything get on your lifters, which your valve covers protect. Once you have the valve covers off compare the new gaskets to make sure they are the right size. Then remove the old gasket and replace with the new one using a high temp gasket sealant (available at any auto parts store) to attach the gasket to the valve covers. Then tighten down snug and check for leaks after replaced.