- cylinder head housings (cylinder head mating plane);
- valves (wear of the rod, condition of the locking surface, presence of burnouts),
- valve guide bushings (wear);
- valve seats (condition of locking surfaces);
- working surfaces of camshaft bearings (wear);
- mounting surfaces of hydraulic compensators (wear);
- valve seals (elasticity, condition of the oil scraper edge).
After removing the cylinder head, the values of the cylinder head control dimensions should be checked.
Information copied from the website mercedesman.ru