This procedure applies to either cylinder head, and the manufacturer recommends removing the engine and transaxle assembly to perform it. Begin by removing the camshafts and camshaft housings, followed by the exhaust manifolds. If the left cylinder head is being removed, gradually loosen and remove the two front bolts. Remove the cylinder head bolts gradually and evenly in the order opposite to the tightening sequence, then take off the cylinder head from the engine block and discard the old cylinder head gasket. Ensure the mating surfaces of the cylinder heads and block are perfectly clean before installation; use a gasket scraper to eliminate all traces of carbon and old gasket material, then clean with brake system cleaner. Stuff the cylinders with clean shop rags to prevent debris from entering, and use a vacuum cleaner to remove any material that falls into the cylinders. Inspect the block and head mating surfaces for nicks, deep scratches, and other damage, addressing slight damage with a file or considering machining for excessive damage. Use a tap of the correct size to chase the threads in the cylinder head bolt holes and clean them with compressed air, ensuring nothing remains in the holes. Mount each bolt in a vise and run a die down the threads to remove corrosion and restore them, as dirt, corrosion, and damaged threads can affect torque readings. Measure the outside diameter of each cylinder head bolt 4 inches below the head, replacing any bolt with a diameter less than the allowable minimum. Position the cylinder head gasket on the engine block with the lot number stamp facing up, then carefully place the cylinder head on the gasket. Apply a light coat of oil to the cylinder head bolts, install and tighten them gradually and evenly in the proper sequence, ensuring to include the washers. After tightening all eight bolts to the initial torque, mark the front edge of each bolt and retighten each bolt another 90 degrees in the same sequence, repeating this process to achieve a total of 180 degrees from the initial torque. If installing the left cylinder head, tighten the two front head bolts in the correct sequence after tightening the other bolts. If both cylinder heads were removed, install the other cylinder head now. Proceed to install the intake and exhaust camshaft assemblies, followed by the camshaft timing oil control valve, oil control valve filter, and VVT-i sensor. Install the timing chains, timing chain cover, and all components attached to the cover. The remainder of the installation follows the reverse order of removal. Refill the engine with oil and coolant, reconnect the cable to the negative battery terminal, start the engine, and check for leaks.
Posted by ToyotaPartsDeal Specialist 
