How to remove and install the cylinder head on Toyota Prius?

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To take off the cylinder head, among measures, first, the fuel pressure has to be released and second, disconnect a cable from the negative terminal of the 12-volt battery while completing the initialization procedure after its connection again. Pull out all the transaxle coolants and drain the cooling system, then you can proceed to remove the inverter/converter assembly. Next, unbolt the valve cover, throttle body, fuel injectors, and fuel rail, the intake manifold and exhaust manifold with the proviso to remove the oxy sensor. Disconnect and unbolt the timing chain and camshaft sprockets, followed by the camshafts and lifters; it should be noted that on the 2010+ models, the whole camshaft housing should be taken out. Remove the VTCG control valve and filter, localise and remove coolant, hoses and tubes and electrical connectors from the cylinder head on 2004 and later models, and the dipstick guide. Tighten and loosen the cylinder head bolts, usually in a preset pattern, turning them in the opposite direction for equal intervals, in order not to warp or crack it and also for 2001 through 2003 models, always remove the bolt that secures the water tube to the cylinder head. remove the cylinder head from the engine block with some force if it has become nipped on then clean all evident external parts as well. For installation, it is required to ensure that mating surfaces of the cylinder head and block must be free from any type of gasket and cleaning agents must be used with the help of a gasket scraper. Inspect the mating surfaces, and peel the threads using compressed air on the holes of the cylinder head bolts. Same with the threads on each bolt, make sure that it is free from dust and other debris and also examine if the threaded portion that is subjected to prior tension stretching, replace if its length measures more than 5.791 inches. Make sure the components that have been taken out from the cylinder head are fitted back as they should be, place the new gasket in the right position and gently place the cylinder head on the block. Dip the threads and under the bolt heads with clean engine oil before inserting the bolts into their initial positions and tighten them in a three procedures in a way that the last procedure requires a further 90 degrees of turning. The remaining installation steps are simply the reverse of the removal steps After that you need to add fresh oil and filter/ looked at the fill the cooling system/ start the engine and look for leaks.

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