On twin cam engines, remove the crankshaft and hydraulic valve lifters with a rubber plunger - do not turn the cylinder head over to remove them. Always keep the valve lifters upright (oil groove at the bottom as shown in the figure) and immerse them in the order of removal in a container with clean engine oil and keep them in it until installation.
To remove the valve, install a valve spring remover. Make sure that its ends firmly grip the valve head and spring retainer.
Compress the valve spring to relieve pressure on the valve spring retainer, which presses on the valve keepers. If the retainer sticks to the valve stem, secure the fixture and tap the ends lightly with a soft-sided hammer.
Remove the two valve cotters, then carefully remove the tool.
(Text copied from a web portal: Opelbook.ru)
Repeat the operations with the remaining valves, keeping all the parts in strict order so that they can be installed in their original position, unless all the parts are to be replaced. In the event that they are to be used in the future, place each valve assembly in a separate plastic bag with a label. The cylinders and valves are counted from the end of the timing belt. On engines with two camshafts, the valve parts are distinguished into intake and exhaust, and also by numbers.
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