Maintenance of the lubrication system (Mercedes-Benz M-Class W163)

1. The details of the installation of the oil pan on the 111 series engine are shown in the illustration to which all references in the text refer.

2. Drain the engine oil (see Chapter Changing engine oil and oil filter).

3. Remove the cooling fan assembly with viscous coupling (26).

4. Unbolt the expansion tank (8) of the cooling system from the engine compartment bulkhead.

5. Unscrew the bolts (9) securing the front powertrain support cushions to the vehicle frame (see Section Removal and installation the powertrain suspension supports).

6. Suspend the engine on a winch.

7. Disconnect the oil level sensor wiring (S43).

8. Unscrew the mounting bolts and remove the oil pan (56).

(Article based on data from the website: www.MercedesMan.ru)

9. Carefully clean the mating surfaces and install a new sealing gasket (56a) on the pan.

10. Installation is carried out in reverse order.

Note: Temporary fixation of the tray to the block can be done using spot-applied sealant.

Removal and installation the oil level sensor

The installation details of the 111 Series engine oil level sensor are shown in the illustration to which all references in the text refer.

Removal and installation the oil pump

1. The installation details of the oil pump for the 111 series engine are shown in the illustration to which all references in the text refer.

2. Remove the oil pan (see above).

3. Remove the oil pump drive sprocket (25) complete with the chain attached to it.



4. Unscrew the mounting bolts (28/28a) and remove the pump assembly (24/24a).

5. Thoroughly clean the mating surfaces of the pump and engine block.

6. Fill the pump assembly with fresh oil.

7. Installation is carried out in the reverse order. When installing the first version pump, note that the two front bolts (28) are equipped with guide bushings (27). On the second version pumps, do not forget to replace the sealing ring (29).

Note: The sprocket is installed with the protrusion towards the pump.

Replacing the oil pump drive chain

1. The installation details of the oil pump drive chain on the 111 series engine are shown in the illustration to which all references in the text refer.

2. Drain the cooling system (see Chapter Checking the cooling system and frost resistance of the coolant, replacing the liquid).

3. Drain the engine oil (see Chapter Changing engine oil and oil filter).

4. Remove the liquid heat exchanger (9).

5. Remove the oil pan (10) (see above).

6. Remove the oil pump (see above).

7. Using a special tool, disassemble the pump drive chain and remove it from the engine.



8. Remove the oil pump drive sprocket (25).

9. Installation is carried out in the reverse order - use a special device to connect the chain.

Replacing the non-return valve

1. The installation details of the non-return valve of the lubrication system of the 111 series engine are shown in the illustration to which all references in the text refer.

2. Remove the timing belt cover (see Section Removal and installation timing belt covers).

3. Using pliers (1), remove the non-return valve (8) from its seat in the engine crankcase.

4. Installation is carried out in reverse order.

M112/113

Removal and installation the oil filter housing

1. The details of the installation of the oil filter on the 112 and 113 series engines are shown in the illustration, to which all references in the text refer.

2. Remove the front cover of the power unit.

3. Remove the powertrain trim panel/air cleaner.

4. Remove the fan assembly (1) and fan shroud (2), - on ML 55 AMG and ML 500 models, remove the electric fan assembly with shroud.

5. Unscrew the cover (4) of the oil filter housing (5).

6. Unscrew the bolts (9) securing the liquid heat exchanger (3) to the casing (5) of the oil filter.

7. Remove the casing (5).

8. Installation is carried out in reverse order.

9. Finally, check the engine oil level and make the appropriate adjustments if necessary (see Chapter Changing engine oil and oil filter).

Removal and installation the liquid heat exchanger of the oil filter

1. The installation details of the liquid heat exchanger of the oil filter on the 112 and 113 series engines are shown in the illustration to which all references in the text refer.



2. Perform the procedures described in paragraphs 1 through 5 of Removing and Installing the Oil Filter Housing, making adjustments for the changes in the designations in the illustration.

3. Drain the coolant from the radiator (see Chapter Checking the cooling system and frost resistance of the coolant, replacing the liquid).

4. Disconnect the cooling tract lines (4 and 5) from the liquid heat exchanger (6).

5. When equipped accordingly (models ML 55 AMG and ML 500) remove the air pump assembly (see Section Removal and installation timing belt covers).

6. Loosen the mounting bolts and remove the heat exchanger assembly (6) from the filter housing.

7. Installation is carried out in reverse order.

8. Finally, make sure there are no signs of developing coolant leaks.

Removal and installation the engine oil dipstick guide tube

1. The installation details of the dipstick guide tube on 112 and 113 series engines are shown in the illustration to which all references in the text refer.



2. Remove the crankcase guard (see Chapter Body).

3. Remove the powertrain trim panels/air cleaner assembly.

4. Unscrew the bolt (2) securing the guide tube (1) of the feeler gauge (3) to the cylinder head.

5. Remove the bandage tape (7).

6. Pull up and remove the tube (1) from the engine.

7. Installation is carried out in reverse order.

Removal and installation the oil pan

Bottom section of the pallet

1. The installation details of the lower section of the oil pan on engines of the 112 and 113 series are shown in the illustration, to which all references in the text refer.

2. Remove the powertrain trim panel and air cleaner (1).

3. Remove the cooling fan assembly with viscous coupling (4).

4. Unscrew the bolts (8) and remove the fan assembly casing (5).

5. Remove the air deflector (9).

6. Drain the engine oil (see Chapter Changing engine oil and oil filter).

7. Loosen the nuts (7) securing the front support of the powertrain suspension.

8. Remove the resonator chamber (2) with the connecting sleeve (3).



9. Suspend the engine on a winch.

10. Loosen the mounting bolts and remove the lower section of the oil pan (6).

11. Clean the mating surfaces thoroughly.

12. Installation is carried out in reverse order.

Note: The tray is installed on a sealant, which should be applied in a pad 2.0 mm wide and 0.5 mm thick.

Upper section of the pallet

1. The installation details of the upper section of the oil pan on engines of the 112 and 113 series are shown in the illustration to which all references in the text refer.

2. Remove the lower section of the oil pan (1) (see above).

3. Disconnect the electrical wiring from the oil level/temperature/quality sensor (B40).

4. Remove the upper section of the oil pan (3) by sliding it forward - if necessary, turn the crankshaft slightly.

5. Installation is carried out in reverse order.

Removal and installation the oil level sensor

1. The details of the installation of the oil level sensor on engines of the 112 and 113 series are shown in the illustration, to which all references in the text refer.

2. Remove the lower section of the oil pan (1) (see above).

3. Disconnect the contact connector (3) of the sensor wiring.

4. Loosen the mounting bolts (2) and remove the oil level sensor (S43).

5. Installation is carried out in reverse order.

Removal and installation the oil pump

1. The installation details of the oil pump for the 112 and 113 series engines are shown in the accompanying illustration, to which all references in the text refer.

2. Remove the lower section of the oil pan (1) (see above).

3. Remove the mounting screws (4).

4. Pull back the chain tensioner and remove the chain from the pump assembly drive sprocket.

5. Remove the oil pump (2).

6. Check the condition of the oil intake mesh filter, assess the correct fit of the check valve (3).

7. Fill the pump assembly with fresh oil.

8. Installation is carried out in reverse order.

Removal and installation the oil pump pressure relief valve

1. The installation details of the oil pump pressure relief valve components on 112 and 113 series engines are shown in the illustration above (see round insert), to which all links found in the text belong.

2. Remove the oil pump (see above).

3. Remove the plug and replace the pressure reducing valve assembly components.

Replacing the oil pump drive chain

1. The details of the installation of the oil pump drive on the 112 and 113 series engines are shown in the illustration above, to which all references in the text refer.

2. Remove the lower section of the oil pan (1) (see above).

3. Remove the top section of the tray (see above).

4. Remove the oil pump assembly (2) (see above).

5. Using a special tool, disassemble the pump drive chain and remove it from the engine.

6. Remove the oil pump drive sprocket (25).

7. Installation is carried out in the reverse order - use a special device to connect the chain.

Removal and installation oil sprayers

1. Details of the installation of oil sprayers on engines of series 112 and 113 are shown in the accompanying illustration, to which all references in the text refer.

2. Remove the lower and upper sections of the oil pan (see above).

3. Remove the oil pump (see above).

4. Unscrew the mounting bolts (2) and remove the oil sprayers (1), - if necessary, turn the crankshaft slightly.

5. Check the oil flow patency and clean it if necessary.

6. Installation is carried out in the reverse order - try to avoid deformation of the feed tubes (3) of the oil sprayers (1).