Mercedes M-Class W163

since 1997 release

Repair and operation of the car

Replacement of a gas-distributing chain

M612

Replacement of a gas-distributing chain on the series 612 engine

Illustrative material on replacement of a chain of the GRM drive of the engine of a series 612 is presented on an illustration to which all references which are found in the text belong.

Removal

PERFORMANCE ORDER

Uncover a head of cylinders. Remove the vacuum pump. Remove assembly of the fan of the cooling system. By means of special adaptation dismember links of a chain and remove it from the engine.

Installation

PERFORMANCE ORDER

Get a new chain (2) on the regular place and by means of special adaptation make a joint of links. Having executed necessary preparations (see the Section Removal and installation of components of the GRM drive), establish a natyazhitel of a chain (14). Check correctness of basic position of camshafts (see the Section Verification of the Basic Provision of a Balancing Shaft (only series 628 engines)). Install the vacuum pump. Establish a cooling system fan clutch coupling. Establish a cover of a head of cylinders. Start the engine and check it for existence of signs of development of leaks.

M628

Check

Replacement of a gas-distributing chain on the series 628 engine

1 — the Inlet camshaft 2 — the Pulley of a driving belt	3 — the Tag 4 — the Lock

PERFORMANCE ORDER

Illustrative material on check of a condition of a chain of the GRM drive of the engine of a series 628 is presented on an illustration to which all references which are found in the text belong. Assessment of degree of a pulling of a chain is made by means of verification of the provision of a pulley (2) of a driving belt on the blocked inlet camshaft. Uncover the right head of cylinders. Take off a belt of the drive of auxiliary units. Having turned the engine in the normal direction (shooter), block an inlet shaft (1) by means of adaptation (4). If the shift of a pulley (2) makes more than 11 ° (after VMT), the chain should be replaced. Having finished check/replacement, establish into place a belt of the drive of auxiliary units and a cover of a head of cylinders.

Removal and installation

Replacement of a gas-distributing chain on the series 628 engine

1 — the Old gas-distributing chain 2 — the New gas-distributing chain	010 — the Holder

Illustrative material on replacement of a chain of the GRM drive of the engine of a series 628 is presented on an illustration to which all references which are found in the text belong.

Removal

PERFORMANCE ORDER

Open a cowl and record it in vertical position. Uncover heads of cylinders. Uncover the first bearing of the final camshaft of the right head of cylinders (see the Section Removal and installation of the GRM components). Fix on the right head holders (010 and 011). Make a partition of links and remove an old chain (1) from the engine.

Installation

PERFORMANCE ORDER

Get a new chain (2) on the regular place and make a joint of its links. Check correctness of basic position of camshafts (see the Section Installation of Basic Position of Camshafts). Check correctness of basic provision of a balancing shaft (see the Section Verification of the Basic Provision of a Balancing Shaft (only series 628 engines)). Remove holders (010 and 011). Establish a cover of the first bearing of the final camshaft of the right head of cylinders. Establish covers of a head of cylinders. Close a cowl.