How can broken valve springs and defective valve stem seals be replaced without removing the cylinder head on Toyota Supra?

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Damaged valve springs along with a faulty valve stem seal can easily be repaired and substituted without the removal of the cylinder head and it chiefly involves the usage of tools like valve spring compressors and a supply of compressed air. Start with the removal of the timing belt cover and the timing belt, together with the camshafts and other related components as a result of the model year of the automobile. The withdraw the spark plug of the cylinder in question; if replacing all valve stem seals, then all spark plugs should be withdrawn. Rotate the crankshaft through a full cycle to make the piston of the required cylinder reach the Top Dead Center, operate on them in turns according to the firing sequence. Insert an adapter into the spark plug hole, and attach an air hose to push down the valves using compressed air. If potentially explosive air is not available, place the piston about 45 degrees before top dead center and force the combustion chamber full of nylon rope which the end will be able to be pulled out of. The keepers are compressed with the aid of a valve spring compressor, and afterwards, pull out the spring retainer, the spring itself, and the oil seal. Screw the valve stem cap back on if it was removed and secure the stem with a rubber band or tape to avoid losing it; depressurize the tire. Upon checking the valve, you should check for physical damages on the valve stem, and would also want to ensure it slides easily in the guide. Reapply the air pressure to keep the valve retained together with the installation of a new oil seal on the valve stem after applying engine oil on the stem. Place the spring & retainer, compress the setting spring & place the keepers if required lubricate the same. Remove the air hose and the adapter and then replace the cam shafts and related parts depending on the model year of the car then fit the timing belt and its cover. Lastly secure the spark plugs, connect the wires, and start the engine; ensure that there is no dripping of oil and that the car does not make abnormal noises.

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