Contents: Removal ↡ Installation ↡
Attention! To fix the fuel pump shaft, it is necessary to use a special tool. Using a tool made by yourself can damage the parts of the high-pressure fuel pump.
Removal
Fuel pump sprocket housing
A – mounting bolts;
B – locking pin
Using a DIY tool to remove the drive chain from the fuel pump sprocket teeth
A – drive chain;
B – self-made tool
1. Remove the ground cable from the battery.
2. Remove the clips and pull out the soundproofing panel from the back of the engine compartment.
3. Remove the auxiliary drive belt tensioner.
4. Remove the radiator fan and shroud.
5. Remove the vacuum pump from the cylinder head cover. Remove the gasket from the vacuum pump.
6. Using the crankshaft pulley mounting bolt, turn the engine crankshaft in the direction of working rotation so that the piston of the first cylinder is set to the 15° position after the top dead center. Perform the installation by aligning the corresponding mark on the torsional vibration damper with the pointer (see Fig. Setting the piston of the first cylinder to the 15° position).
7. If present, unscrew the housing located in front of the fuel pump sprocket (see fig. Fuel pump sprocket housing). On later models, the housing is secured with a locking pin. To remove the locking pin, screw an M6 bolt into it and, using an inertia hammer with an adapter, remove the locking pin.
8. Remove the cylinder head cover.
9. Remove the drive chain tensioner mechanism.
10. Unscrew and remove the bolt and gasket securing the camshaft drive chain sprocket.
11. Using soft wire, tie the camshaft sprocket and drive chain together.
12. Remove the sprocket together with the drive chain from the end of the camshaft.
13. Unscrew the housing from the front side of the fuel pump sprocket.
14. Remove the central bolt securing the fuel pump sprocket.
[Article borrowed from the web portal: mercedesman.ru]
Caution! The central bolt securing the fuel pump sprocket has a left-hand thread.
15. Using paint, mark the position of the fuel pump sprocket in relation to the drive chain.
16. Remove the drive chain from the fuel pump sprocket teeth. To do this, use a sheet of thick tin measuring 140 x 70 mm and bend it into a circle so that the diameter of the circle is equal to the diameter of the fuel pump sprocket. Place the homemade tool against the fuel pump sprocket, then expand it so that the drive chain is removed from the fuel pump sprocket teeth, and secure the tool in this position (see fig. Using a homemade tool to remove the drive chain from the fuel pump sprocket teeth).
17. After removing the drive sprocket from the fuel pump teeth, use the grips to remove the injection timing adjustment mechanism together with the sprocket from the drive chain cover.
18. Unscrew the plug covering the installation hole on the side surface of the high-pressure fuel pump.
19. Using special grips, turn the fuel pump shaft in the direction of the working movement until you see the regulator housing through the installation hole. Turn the fuel pump shaft until the protrusion on the regulator housing aligns with the center of the installation hole. Using a special tool, fix the regulator housing from turning through the installation hole (see fig. Using a special tool to prevent the regulator body from turning).
Caution: When turning the high-pressure fuel pump shaft, be careful not to damage the surface of the fuel pump shaft.
Installation
Fuel pump sprocket and injection timing adjustment mechanism
A – camshaft sprocket; B – fuel pump sprocket and fuel injection timing adjustment mechanism; C – case; D – mounting pin; E – fuel pump sprocket mounting bolt; F – vacuum pump
1. Installation is carried out in the reverse order of removal, taking into account the following points (see fig. Fuel pump sprocket and injection timing adjustment mechanism).
2. Before installing the sprocket and fuel injection timing adjustment mechanism on the fuel pump shaft, check that the piston of the first cylinder is set to the position 15° after top dead center.
3. When installing the fuel pump sprocket, align the marks on the sprocket and drive chain.
4. Secure the engine crankshaft from turning and tighten the fuel pump sprocket mounting bolt to the specified torque.
Caution! The fuel pump sprocket mounting bolt has a left-hand thread.
5. Remove the special tool that secures the distributor housing from the fuel pump and close the installation hole with a plug.
6. Install the sprocket onto the camshaft. Rotate the engine crankshaft one full revolution and check that the timing marks on the camshaft and crankshaft are aligned with the pointers.
7. When installing the vacuum pump, use new seals.
8. Check and, if necessary, adjust the fuel injection timing.