Contents: Removal ↡ Installation ↡
Removal
Upper Front Cover Installation Details
1a - Retainer; 3 - Distributor rotor (engines 120.980); 4 - Runner (engine 120.980); 5 - Protective cover (engines 120.980); 5a - Sealing (engine 120.980); 6 - Rubber gasket; 7 - Sealing ring; 8 - Power steering pump reservoir; 9a - Cooling system hose; 11 - Bracket; 12 - Power steering pump; 12a - Power steering pump adapter; 12b - Seal; 13 - Guide bridge; 30 - Right front cover; 30a - Left front cover
Support Bracket Installation Details
11 — Bracket
13, 14 — Bolts M8x85
1. Remove the cylinder head covers.
2. Remove the radiator.
3. Remove the generator drive belt.
4. Remove the thermostat housing.
5. Remove the guide roller.
6. Remove the cooling system hose (9a).
7. Remove the rotor and runner (4) of the distributor (engines series 120.980).
8. Remove the protective cover and seal.
9. Lift the power steering pump reservoir up and remove it along with the pipes.
10. Unscrew the bracket (11) and remove it. 11. Unscrew the adapter (12a) of the power steering pump (12).
12. Loosen the bolts (arrows) and remove the front covers.
13. Replace the rubber gasket and sealing ring under the cooling system pipe.
14. Wipe the sealing surfaces of the front cover and cylinder head. 15. Check the timing chain guide bridge gaskets for signs of damage and replace them if necessary.
Installation
When installing the top covers, make sure that the rubber gasket is not displaced downwards (arrows)
1 — Bushing
2 — Sealing edge of the oil seal
31 — Guide lever pin
Left upper cover mounting bolts (the right top cover is installed in a mirror image)
1, 2 — Bolts M8x65
3 — Bolts left upper M8x50 right upper M8x65
1. Apply sealant 002 989 7320 10 to the groove of the timing chain cover of the left and right cylinder heads. Insert a new gasket (without sealant) into a dry groove. Lubricate the top of the gasket with engine oil. Lubricate the contact surfaces of the cylinder head with the same sealant.
2. On 120.980 engines, install the sleeve (1) on the exhaust camshaft. Lubricate the sealing lip of the radial oil seal (2) with engine oil.
3. Install the front covers. When installing them, make sure that the rubber gasket is not displaced downwards, remove the chamfer from the bottom of the gasket. On the left cover, remove the plug (31), the guide lever pin and reinstall them after installing the cover.
4. Install the cover mounting bolts. Tighten the bottom bolts first.
5. Further installation is carried out in the reverse order of removal. The cutout on the runner (4) should be aligned with the pin on the camshaft.
(Material taken from a web resource: mercedesman.ru)