Contents: Timing Belt Cover M111 ↡ M112/113 ↡
Front Cylinder Head Cover Installation Details (111 series engines)
1. The installation details of the 111 series engine front cylinder head cover are shown in the illustration to which all references in the text refer.
2. Remove the cylinder head (see Section Removal and installation of cylinder head(s)).
3. Remove the thermostat housing (3) (see Chapter Cooling, heating and air conditioning systems).
4. Loosen the secondary air mixing switch valve (Y32).
5. Unscrew the mounting bolts (1 and 2) and remove the front cylinder head cover.
6. Carefully clean the mating surfaces. Installation is performed in the reverse order - the cover is placed on the sealant. Make sure that all fasteners are tightened with the required force.
Timing Belt Cover M111
Timing Belt Cover Installation Details for 111 Series Engines
Timing Belt Cover Installation Details for 111 Series Engines
Timing Belt Cover Installation Details for 111 Series Engines
A — Bolts securing the timing belt cover to the cylinder head
Timing Belt Cover Installation Details for 111 Series Engines
3 - Guide pins
1. The installation details of the timing cover on the 111 series engine are shown in the illustrations to which all references in the text refer.
2. Disconnect the negative cable from the battery.
3. Remove the left air boost tract hose assembly with the MAF sensor (see Section Removal and installation the engine).
4. Remove the oil filter cartridge (see Chapter Changing engine oil and oil filter) and drain the oil into the prepared container.
5. Remove the cooling fan assembly with viscous coupling (see Chapter Cooling, heating and air conditioning systems).
6. Remove the cooling fan shroud (see Chapter Cooling, heating and air conditioning systems).
7. Remove the oil pan (see Section Maintenance of the lubrication system).
8. Remove the supercharger drive belt.
9. Remove the accessory drive belt.
10. Drain the cooling system (see Chapter Cooling, heating and air conditioning systems).
11. Remove the generator support bracket/generator assembly with support bracket (see Chapter Engine electrical systems).
12. Remove the accessory drive belt tensioner assembly (see Chapter Engine).
13. Remove the front cylinder head cover (see above).
14. Remove the water pump (see Chapter Cooling, heating and air conditioning systems).
15. Remove the steering pump drive pulley (44) - the pulley can be held from turning by crimping the temporarily installed drive belt.
16. Unbolt the bracket (47).
17. On models without K/V, remove bracket (46b). On models with K/V, remove brackets (46) and (46a).
18. Remove the steering pump (45) and move it to the side without disconnecting the hydraulic lines.
19. Turning the crankshaft in the normal direction, bring the piston of the first cylinder to a position of 20-30° after TDC (see arrows in illustration 5.7b).
20. Using the locking rods (01), secure the camshafts.
21. Use a marker to mark the position of the timing chain relative to the camshaft sprockets (75 and 76).
22. Remove the chain tensioner (14).
23. Remove the exhaust (76) and intake (75) camshaft sprockets.
Note: The bolts securing the sprockets must be replaced.
24. Remove the intake shaft assembly with the regulator.
25. Remove the chain guide pins (11).
Note: When installing, the pins are seated with sealant.
26. Remove the bolts (A) securing the timing belt cover to the cylinder head.
Note: The bolts are equipped with TORX type heads.
27. Remove the drive belt pulley assembly with built-in vibration damper (95).
28. Mark the timing belt cover mounting bolts with a marker.
29. Unscrew the mounting bolts and remove the cover (65), being careful not to damage the head gasket.
30. Replace the front crankshaft oil seal (see Section Replacing the front crankshaft oil seal).
31. Carefully clean the mating surfaces of the engine cover and crankcase.
32. Replace the sealing rings (66).
33. Lubricate the mating surface of the cover with sealant, making sure that the latter does not get into the oil reservoir (65a) of the timing chain.
34. Installation is carried out in the reverse order - when installing the cover, pull the chain up, completely removing its slack at the bottom. Make sure that all fasteners are tightened with the required force.
M112/113
Timing Belt Cover Installation Details for Series 112 and 113 Engines
1 - Assembly of the fan with viscous coupling; 2 - Auxiliary drive belt; 3 - Cooling system fan shroud; 4 - Torsional vibration damper; 5 - Tensioner assembly; 6 - Cylinder head covers with ignition coils; 7 - Oil filter housing with built-in liquid heat exchanger; 9 - Lower section of the oil pan; 11 - Steering pump; 12 - Water pump; 13 - Thermostat housing; 14 - Timing chain tensioner; 15 - Guide roller; 16 - Coolant hose from radiator to thermostat housing; 17 - Cooling tract hose connecting the circulation and water pumps (additional equipment); 18 - Cooling system hose from radiator to water pump; 19 - Timing case sealing rings; 20 - Air pump; 21 - Timing belt cover to cylinder head mounting bolts; 22 - Upper section of the oil pan; 23 - Support bracket for AT oil lines; A9 - Compressor K/V; G2 - Generator
1. The installation details of the timing cover on series 112 and 113 engines are shown in the illustration, to which all references in the text refer.
2. Disconnect the negative cable from the battery.
3. Remove the powertrain trim panels.
4. Drain the coolant from the radiator.
5. Remove the powertrain cover/air cleaner assembly from the cylinder heads.
6. Remove the cooling fan assembly with viscous coupling (1).
7. Remove the lower bolts and fan shroud/electric fan assembly.
8. Install the radiator/condenser protection screen.
9. Remove the accessory drive belt (2).
10. Remove the cylinder head covers (6).
11. Disconnect the water pump lines (17 and 18).
12. Disconnect the hose (16) from the thermostat housing.
13. Remove and, without disconnecting the refrigeration lines, move aside the A/C compressor (A9).
14. Remove the lower section of the oil pan (see Section Maintenance of the lubrication system).
15. Remove the upper section of the oil pan (see Section Maintenance of the lubrication system).
16. Remove the accessory drive belt tensioner assembly.
17. Remove the torsional vibration damper (4)
18. Remove the timing chain tensioner (14).
19. Remove the oil filter housing (7) equipped with a built-in liquid heat exchanger.
20. Remove and, without disconnecting the hydraulic lines, move the steering pump assembly (11) to the side.
(Article was obtained from the portal: MERCEDESMAN)
21. Remove the guide roller (15) of the auxiliary drive belt from the timing drive cover.
22. Remove the air pump (20).
23. Separate the electrical wiring from the thermostat.
24. Remove the bolts (21) securing the timing belt cover to the cylinder heads.
25. Remove the timing belt cover mounting screws.
Note: When installing, the threaded portion of the screws should be lubricated with sealant.
26. Remove the timing belt cover.
27. Carefully clean the mating surfaces of the engine cover and crankcase.
28. Installation is carried out in the reverse order - a sealant pad of about 2.0 mm wide and about 0.5 mm thick should be applied to the mating surface of the cover (make sure that the sealant does not get into the oil passages). Do not forget to replace the cover sealing rings (19) and the front crankshaft oil seal. Make sure that all fasteners are tightened to the required torque.
29. Finally, clear the on-board diagnostic system memory by first reading the DTC codes stored in it (see Chapter Engine electrical systems).