Accessory Drive Belt Installation Details on Models Equipped with 111 Series Engine
1. Installation details of the accessory drive belt on models equipped with a 111 series engine are shown in the illustration, to which all references in the text refer.
2. If equipped, remove the viscous clutch of the cooling fan (26), - the fastener has a left-hand thread. On models with an electric fan, remove the fan assembly (see chapter Cooling, heating and air conditioning systems).
3. If equipped, remove the V-belt (10) compressor drive K/V.
4. Expanding lever (2) tensioner with roller (3) anti-clockwise on a hairpin (4), loosen the tension of the accessory drive belt (11).
Note. Do not turn the lever on the idler nut.
5. Remove the belt (11) and assess its condition (see chapter Replacement of the auxiliary drive belt and elements of its tensioning mechanism). Replace if necessary.
6. Installation is carried out in the reverse order - follow the correct placement of the components of the automatic tension mechanism (A and B).
Tensioner damper
Installing the Damper for the Auto-Accessory Belt Tensioner on Models Equipped with the 111 Series Engine
6 - Nut; 7 - End cap (release models up to 03.09); 13 - Bolt M8x35 with washer; 14 - Bolt M8x25 with washer
1. Installation details of the accessory drive belt tensioner damper on models equipped with a 111 series engine are shown in the illustration, to which all references in the text refer.
2. Remove the fan shroud (1) cooling systems (see chapter Cooling, heating and air conditioning systems).
3. Remove the drive belt (2).
4. Loosen and remove the tension roller (3).
5. Loosening the fixing bolt with a bar wrench (15), remove the tensioner damper (9).
6. Installation is carried out in the reverse order.
Tensioner
Installation details of the automatic accessory drive belt tensioner on models equipped with a 111 series engine
1. Installation details of the accessory drive belt tensioner on models equipped with a 111 series engine are shown in the illustration, to which all references in the text refer.
2. Remove tensioner damper (9) (see above).
3. On models with A/C, unbolt the support bracket (10).
4. Deploy tensioner arm on stud (4) counterclockwise and fix it with a rod (01), threaded into a special receiving hole (arrow), thereby providing access to the upper mounting bolt (12).
5. Loosen the tensioner (41) and remove it from the engine.
6. Installation is carried out in the reverse order.
M112/113
Belt
Accessory drive belt installation details on models equipped with 112 and 113 series engines (except models ML 55 AMG and ML 500)
Accessory drive belt installation details on models equipped with 112 and 113 series engines (ML 55 AMG and ML 500 models)
1. Installation details of the accessory drive belt on models equipped with 112 and 113 series engines are shown in the illustrations, which include all references in the text.
2. Remove fan assembly (1 and 2) (act in accordance with the package) (see chapter Cooling, heating and air conditioning systems).
3. Expanding the hairpin (4) tension roller (5) counterclockwise, loosen the belt (3) and block the roller with a 5 mm rod.
4. Remove the belt and carefully examine its condition (see chapter Replacement of the auxiliary drive belt and elements of its tensioning mechanism). Replace if necessary.
5. Installation is carried out in the reverse order.
Tensioner
Parts for Installing the Auto-Accessory Belt Tensioner on Models Equipped with 112 and 113 Series Engines
1. Installation details of the accessory drive belt tensioner on models equipped with 112 and 113 series engines are shown in the illustration, to which all references in the text refer.
2. Remove the drive belt (3) (see above).
3. Expand the idler (4a) counterclockwise and fix it with a 5 mm rod.
4. Removing the self-locking bolt (4b), remove tensioner (4) from the timing cover.
5. Installation is carried out in the reverse order.
M612
Belt
Accessory Drive Belt Installation Details on Models Equipped with 612 Series Engine
1 - Drive belt; 2 - Tensioner; 3 - Tension roller; 4 - Pin
1. Installation details of the accessory drive belt on models equipped with a 612 series engine are shown in the illustration, to which all references in the text refer.
2. Remove the fan assembly and its shroud (see chapter Cooling, heating and air conditioning systems).
3. Turning the tensioner and locking it with a pin (4), loosen, then remove the drive belt (1).
4. Examine the condition of the belt (see chapter Replacement of the auxiliary drive belt and elements of its tensioning mechanism), replace if necessary.
5. Installation is carried out in the reverse order.
M628
Belt
Accessory Drive Belt Installation Details on Models Equipped with 628 Series Engine
1 - Drive belt; 2 - Tensioner
1. Installation details of the accessory drive belt on models equipped with a 628 series engine are shown in the illustration, to which all references in the text refer.
2. Jack up the car and put it on stands.
3. Remove the bottom section of the soundproofing.
4. Disconnect the air sleeve from the lower air duct.
5. Loosen the strap (1) and remove it from the engine.
6. Examine the condition of the belt (see chapter Replacement of the auxiliary drive belt and elements of its tensioning mechanism), replace if necessary.
7. Installation is carried out in the reverse order.
Tensioner
Installation Details for Auto-Accessory Belt Tensioner on Models Equipped with 628 Series Engine
1. Installation details of the accessory drive belt tensioner on models equipped with a 628 series engine are shown in the illustration, to which all references in the text refer.
2. Remove the drive belt (2) (see above).
3. Turning the motor in the normal direction, remove the screws (4) and remove tensioner (3).
4. Installation is carried out in the reverse order.