Replacement
1. On SOHC models, remove the rocker arms and rocker shafts. On DOHC models, remove the camshafts. Remove the clearance adjusters from the damaged valves.
2. Remove the spark plugs from the cylinders with faulty valves. If you are replacing all valve stem gaskets, remove all spark plugs.
3. Set the piston of the required cylinder to TDC.
4. Screw the adapter into the spark plug hole and connect the air compressor hose to it.
5. Pump compressed air into the cylinder, the valves will be held in place by the air pressure.
6. Turn the crankshaft clockwise until you feel slight resistance.
7. Compress the valve springs using a special compressor. Remove the cone bushings.
8. Remove the spring retainer and valve spring. Remove the valve stem seals.
[Content based on information from www.MAZbook.ru]
9. Release the air pressure in the cylinder.
10. Inspect the valve spring for cracks and damage, measure the length of the spring in its free state. Inspect the valve stem.
11. Check that the valve stem is not binding and measure the clearance between the stem and the guide bushing. If necessary, the cylinder head will need to be removed to repair the valves and guide bushings.
12. Increase air pressure to close the valves.
13. Lubricate the valve stem with oil and install a new seal.
14. Install the spring and spring plate. Compress the spring and install the cone bushing.
15. Install the remaining parts and test the engine operation.