Timing Drive — General Information, Component Maintenance (Mercedes-Benz S-Class W140)

Note: The timing chain can be replaced without disassembling the engine. Using the tools listed below, the new chain can be connected to the old one, threaded around the sprockets and calked.

Attention! If assembled incorrectly, the valves may collide with the piston crowns!

General information

To perform the procedures for removing and installing timing drive components, you will need the following special tools:

• Crankshaft Hub/Pulley Puller - #103589003300;
• Crankshaft Sprocket Puller - No.102589053300;
• Flywheel/Drive Disc Locking Tool - #601589024000;
• Bolts M6ґ90 mm for locking the flywheel/drive disc;
• Fuel injection pump locking tool - No.601589052100;
• Fuel injection pump separation tool - No.601589000800;
• Fuel injection pump sprocket centering tool - No.601589051400;
• Timing chain link kit - No.602589024000;
• Timing chain link puller (item 1) - No.602589023300;
• Timing chain link puller (item 2) - No.602589046300;
• Timing chain link puller (item 3) - No.602589046301;
• Timing Chain Link Installation Tool - No.602589003900;
• Set of 1 stamp holders for installing timing chain links - No.602589026300;
• Set of 2 stamp holders for installing timing chain links - No.602589036300;
• Device for fixing the chain on the camshaft sprocket - No.602589014000;
• Toolbox - No.602589009800;
• Viscous coupling holder (series 129/140) - № 120589140700;
• Viscous coupling key - No.111589020100;
• Pulley holder - No.603589004000.

Please note the following points:

• Unless otherwise stated, rotate the engine in the normal direction only;
• Observe the specified tightening forces for fasteners;
• If equipped, do not forget to mark the installation position of the CKP sensor before removal;
• Do not turn the crankshaft by the camshaft sprockets or other timing drive sprockets;
• Do not turn the crankshaft or camshafts with the timing chain removed;
• After setting the valve timing, do not forget to check the fuel injection pump settings.

Servicing Timing Drive Components

1. Disconnect the negative cable from the battery.

2. To make it easier to turn the engine, remove all glow plugs.

3. Bring the crankshaft to the TDC position of the piston of the first cylinder (1).

4. Check the correct alignment of the timing marks on the camshafts (2).

5. Before performing repair procedures, remove the tensioner assembly (3).

6. When removing/installing the high-pressure fuel pump, the crankshaft should be brought to a position 15° after TDC of the piston of the first cylinder (4).

7. Before unscrewing the bolt (5), install the sprocket centering tool No.601589051400.

Note: The fuel injection pump sprocket bolt has a left-hand thread.

8. After removing the fuel injection pump, install the lock bolt (6) - tool No.601589052100.

9. When installing the camshaft sprocket, ensure that the guide pin is positioned correctly.

10. Before installation, fill the tensioner by lowering it plunger down into a container with SAE 10 engine oil and pressing the plunger 7-10 times. Check the smoothness of the plunger and the adequacy of its resistance to compression.

11. After completing the necessary repairs, install the tensioner (3) in its regular place.

Note: The M11 camshaft sprocket bolt must be replaced if its installation length "X" exceeds the maximum permissible value (53.6 mm) (7) (see illustration 78.1).

12. Tighten the crankshaft pulley bolt (8) to 320 Nm (bolt A classification 10.9) or 200 Nm + 90° (bolt B classification 8.8).