2. Check the fit of the valve stem seal (205). If the cap is loose on the valve stem, replace the valve guide (204) (repair shop job). 70 - cylinder head, 206 - valve seat.
3. Clean the valve guide (204) brushed (about 20 mm in diameter).
4. Insert the valve into the guide from the side of the combustion chamber and check the back and forth clearance of the valve. In this case, there should not be a noticeable gap in the valve guide.
5. Otherwise, the valve guide must be replaced (repair shop job).