Cars with gasoline engine. Removal
1. Disconnect the intake manifold.
2. Disconnect plug 1 of camshaft position sensor 2 (see illustration).
(Publication taken from an online resource: MercedesMan.ru)
3. Disconnect the crankcase ventilation hose from the cylinder head cover.
4. Engines with air pump: Disconnect the air pump changeover valve from the cylinder head cover.
5. Unscrew the bolts securing the cover to the cylinder head.
6. Remove the cover together with the rubber gasket of the cylinder head cover.
Installation of the cylinder head cover is performed in the reverse order of removal.
7. Inspect the rubber sealing gasket of the cylinder head cover and, if it is porous, replace it with a new one.
8. Clean the sealing surfaces.
9. Install cylinder head cover 1 together with the cover gasket (see illustration).
10. Screw in bolt 2 until it fits against the cover, then bolt 3 and all the others.
Tighten the cylinder head cover mounting bolts with a force of 8 Nm, acting in a crosswise pattern (see illustration 5.9).
Diesel Engine Cars. Removal
11. Remove the injectors, see the relevant chapter.
12. Cars produced before 8/2000. Disconnect the oil filler pipe together with the engine crankcase ventilation hose. To do this:
13. Remove the coolant expansion tank and set it aside from the work area.
14. Remove the intake manifold.
15. Disconnect the two plug connections and the ventilation hose.
16. Pull up to remove the oil filler pipe from the cylinder head cover.
17. Cars produced since 9/2000. Disconnect the oil filler pipe together with the engine crankcase ventilation hose. To do this:
18. Remove the coolant expansion tank and, without disconnecting the hoses from it, set it aside from the work area.
19. Disconnect the intake manifold along with the connected coolant hoses and set them aside.
20. Unscrew the oil filler pipe mounting bolts and, pulling upwards, remove the pipe from the cylinder head cover.
21. Remove the fuel shut-off solenoid valve.
22. Disconnect the main fuel line from the cylinder head cover and, without disconnecting the fuel lines, set them aside from the work area.
23. Disconnect the camshaft position sensor plug.
24. Disconnect the oil feed line from the turbocharger.
25. Disconnect the wires from the glow plugs on the cylinder head cover.
26. Unscrew the mounting bolts and remove the turbocharger mounting bracket.
27. Unscrew the bolts and disconnect the EGR pipe.
28. Disconnect the high pressure line from the cylinder head cover.
29. Unscrew the mounting bolts and remove the cylinder head cover together with the rubber gasket.
Installation of the cylinder head cover is performed in the reverse order of removal.
30. Inspect the rubber sealing gasket of the cylinder head cover and, if it is porous, replace it with a new one.
31. Clean the sealing surfaces.
32. Install the cylinder head cover together with the sealing gasket.
33. Screw in the cover mounting bolts until their heads touch the cover, then tighten them in a crosswise pattern to 8 Nm.
34. Install the oil filler pipe, replacing the old gasket with a new one.
Tightening torques for threaded connections:
- union nut of the discharge line to the high-pressure fuel pump, fuel distribution line, injector - 22 Nm
- fuel distribution line to cylinder head cover - 9 Nm