Preparing to remove the cylinder head of the 111 series engine
Removal the cylinder head of the 111 series engine
1. Illustrative material on the removal and installation of the cylinder head of the 111 series engine is presented in the illustrations, to which all references in the text refer.
2. Drain the cooling system (see Chapter Routine care and maintenance).
3. Remove the expansion tank of the cooling system (see Chapter Cooling, heating and air conditioning systems).
4. Unbolt the intake pipe from the exhaust manifold.
5. Unbolt the exhaust system support bracket from the transmission.
6. Remove the thermostat cover (see Chapter Cooling, heating and air conditioning systems).
7. Disconnect the contact connectors of the electrical wiring connected to the cylinder head.
8. Unbolt the inlet manifold (19) (see Section Removal and installation the intake manifold), separate the latter from the cylinder head and move it to the side.
9. Disconnect the vent line.
10. On engines with an aluminum intake manifold, unbolt the bracket (2).
11. Disconnect the cooling system hose (3) from the rear of the head.
12. Remove the front cylinder head cover (see Section Removal and installation timing belt covers).
13. Unscrew the guide tube (7) of the engine oil level dipstick.
14. On models with AT, unscrew the guide tube (8) of the ATF level dipstick.
15. Turning the crankshaft in the normal direction, bring the piston of the first cylinder to a position of 20-30° after TDC.
16. Secure the camshafts (75 and 78) using locking rods.
17. Use a marker to mark the position of the timing chain on the camshaft sprockets.
18. Remove the chain tensioner (14) (see Section Removal and installation of timing drive components).
19. Remove the chain guide from the cylinder head (see Section Removal and installation of timing drive components).
20. Remove the sprockets (76 and 74) of the exhaust and intake camshafts.
Note: The sprocket mounting bolts must be replaced.
21. Remove the intake camshaft assembly with the regulator (see Section Removal and installation of timing components).
22. Bolt the bracket (16).
23. Remove the guide pins (11).
24. Remove the bolts (A) securing the timing belt cover to the cylinder head (see Section Removal and installation timing belt covers).
25. Loosen and then unscrew the head mounting bolts (12) in several steps.
26. Check the condition of the bolts (12), replace if necessary.
27. Connect the lifting rigging to the bracket (16) and to the rear eye of the engine.
28. Lift up and carefully separate the head from the cylinder block.
29. Carefully clean the mating surfaces of the head and block, completely removing all traces of the old gasket material from them.
30. Clean the threaded holes for the mounting bolts.
31. Installation is carried out in the reverse order of dismantling the components.
M112/113
Preparing to remove cylinder heads of 112 and 113 series engines
Preparing to remove cylinder heads of 112 and 113 series engines
Cylinder head installation details for 112 and 113 series engines
1. Illustrative material on the removal and installation of the cylinder head of the 112 and 113 series engines is presented in the illustrations, to which all references in the text refer.
2. Disconnect the negative cable from the battery.
3. Drive the car onto the lift.
4. On models equipped with engine 113.942 (ML 430), remove the air deflector (1).
5. Drain the cooling system (see Chapter Routine care and maintenance).
6. Remove the power unit cover.
7. On all models except ML 55 AMG and ML 500, remove the viscous coupling cooling fan, then remove the fan shroud.
8. On ML 55 AMG and ML 500 models, remove the electric cooling fan assembly.
9. Install the radiator/condenser protection screen.
10. Remove the air cleaner (7).
11. Remove the air hose (6) with the resonator chamber (7).
12. Release the pressure in the fuel system (see Chapter Relieving pressure in the fuel system of a gasoline engine) and disconnect the fuel line from the fuel line.
13. Remove the ignition coils (12).
14. Remove the cylinder head covers (13).
15. Remove the CMP sensor (15).
16. Auxiliary drive belt.
17. Remove the coolant line (16) on the left cylinder head.
18. Remove the wheel arch protection liner (9).
19. Remove the deflector (10) (models with 113 series engines).
20. Remove the exhaust system support bracket (11).
21. Disconnect the exhaust pipes from the exhaust manifolds.
22. Turning the crankshaft in the normal direction, bring the piston of the first cylinder to a position 40° after TDC, in which there is no risk of the pistons colliding with the valves when turning the camshafts.
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23. Remove the chain tensioner (17) (see Section Removal and installation of timing drive components).
24. Remove the oil filter housing (18) together with the liquid heat exchanger (models with 113 series engines).
25. Remove the camshaft sprocket mounting bolts (19).
26. Remove the camshaft cover bridges (28).
27. Unscrew the bolts securing the cylinder head to the timing belt cover (20).
28. Loosen and then unscrew the head mounting bolts (21) in several steps.
29. Remove the cylinder head.
30. Identify the head gasket version by inspection.
31. Examine the condition of the mounting bolts (21).
32. Carefully clean the mating surfaces of the heads and block, completely removing all traces of the old gasket material from them.
33. Clean the threaded holes for the mounting bolts.
34. Installation is carried out in the reverse order of dismantling the components.
Note: If cavities are detected on the mating surfaces of the heads and block, the gasket is installed on the heads using a sealant.
35. Finally, clear the memory of the on-board diagnostics system processor.