Removing
Note: If there are small cracks (0.5 mm) between the valve seat sleeve and the thread of the spark plug hole, or if only the first threads of the thread of the spark plug holes are broken, the heads can be installed on the engine.
Press the valve spring cup down and pull out the crackers, service stations use a clamping device for this, see figure, or tongs to compress the springs. You can also press the spring cups with two powerful screwdrivers. However, a rag must be placed in the combustion chamber in the cylinder head so that the valve does not fall down when pressed. Have an assistant take out the breadcrumbs.
Pull out the spring cup and valve head.
Installation
Before installation, if necessary, carry out the following work: Check the valves, check the valve guides in the cylinder head, machine the valve seats in the cylinder head, lap the valves, machine the valves, check the tightness of the valve seat.
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