Lexus 11101-29485 Head Sub-Assy, Cylinder

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To remove the cylinder head, first relieve the fuel system pressure and disconnect the cable from the negative terminal of the battery, then drain the engine coolant. Next, remove the drivebelt and alternator, followed by the valve cover, throttle body, fuel injectors, fuel rail, intake manifold, and exhaust manifold. Remove the timing chain and camshaft sprockets, ensuring the engine is supported from below with a floor jack and a block of wood after the pressed steel portion of the oil pan is removed. For 2008 and later models, remove the camshafts, lifters, and camshaft housing. Label and disconnect the coolant hoses and electrical connections from the cylinder head, loosening the cylinder head bolts in 1/4-turn increments until they can be removed by hand, following the reverse order of the tightening sequence. Lift the cylinder head off the engine block, prying carefully if it is stuck, and remove any remaining external components for thorough cleaning and inspection. For installation, ensure the mating surfaces of the cylinder head and block are perfectly clean, using a gasket scraper and brake system cleaner to remove all traces of carbon and old gasket material. Stuff the cylinders with clean shop rags to keep out debris and use a vacuum cleaner to remove any material that falls into the cylinders. Check the mating surfaces for damage, chasing the threads in the cylinder head bolt holes with a tap and cleaning them with compressed air. Install the components that were removed, position the new gasket over the dowel pins in the block, and apply RTV sealant to the ends of the cylinder head gasket. Carefully set the cylinder head on the block without disturbing the gasket, apply clean engine oil to the threads and under the bolt heads of the new cylinder head bolts, and tighten them finger tight before following the recommended sequence for final tightening. The remainder of the installation follows the reverse order of removal, with a caution to wait at least four hours before adding oil and coolant and starting the engine. For 1999 through 2007 models, check and adjust the valves as necessary, change the engine oil and filter, refill the transfer case for 4WD models, and refill the cooling system, running the engine to check for leaks.

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.

Remove the alternator and unbolt and set aside the power steering pump.

Yes, this procedure applies to either cylinder head.

Apply a light coat of oil to the new cylinder head bolts.

Stuff the cylinders with clean shop rags to keep out debris.