How to remove and install cylinder heads in 3.0L and 3.3L V6 engine for the 2008 Toyota Highlander?

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First of all, one needs to unplug the cable from the terminal of a battery; meanwhile to get rid of the cooling system and the engine block one needs to drain them as well. Subsequently, it is necessary to take out the upper and lower intake manifolds, and exhaust manifold(s). Remove and later bolt off the alternator/cooler bracket as well as the power steering pump bracket. Continue with the unbolt and pull out the timing belt, camshaft sprockets, and the upper idler pulley Then, the other bolts on the rear timing bell covers must be unscrewed and the cover detached on the engine block and cylinder heads. Remove the two connectors from the coolant sensor and the water transfer casting as well, add a condition that the transfer hose must be replaced every time the intake manifold is being removed. Extract the camshaft(s) of the head(s) to be removed and pull out the connectors of the camshaft position sensor and the VVT oil control valve. Bay the bolts at the back of the cylinder heads and uncover the situation of the engine wiring harnesses. Using an 8 mm hex bit, take out the recessed head bolts next, then turn the rest of the cylinder head bolts in 1/4 turn intervals to shed, along with hardened washers. Remove the cylinder head from the engine block with a little force if needed; you can use a wooden block and hammer to do this and do the same to the other head if it was required. As far as the installation is concerned, the mating surfaces of the cylinder heads and the block must be free from contamination, therefore, use a gasket scraper and clean it using a lacquer thinner or acetone. Metting surfaces, evaluate, for existence of scratches or any other damages and correct them if found. If there are threads in the cylinder head bolt holes, chase them with a tap, and blow the debris with compressed air. Clean each bolt in a vise and using a die apply it down the threads to 'lubricate' the bolts, replace any thin or worn bolts. Align the new gaskets properly over the dowel pins in the block, and put the head carefully on the block without anay disturbance to the gasket. Coat the threads of the head bolts with clean engine oil, then spread the head bolts back into their original positions and provide a turn using fingers. According to the suggested sequence, the tightening torque of each bolt should be checked and taken note of the orientation of each bolt head by applying paint. Loosen each of the 12-point bolts and after that, you tighten them 1/4 turn more and then the recessed bolt has to be tightened. Perform the same procedure for the other cylinder head and carry out the rest of the installation process, starting from the final step, to order. Last of all, add the liquid necessitated for the cooling system, replace the oil and the filter, start the engine and look for dripping.

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