Contents: Removal ↡ Installation ↡
Removal
1. Remove the radiator, vacuum pump, oil level indicator guide pipe, oil filter, oil filter housing with oil radiator.
2. Set the piston of the first cylinder to the position 15° after BDC.
3. Disconnect connecting rod 1 from fuel injection pump rack control lever 2 (see figure 4.63).
Figure 4.63. High pressure fuel pump:
1. Connecting lever,
2. Fuel injection pump rack control lever,
3. Bracket,
4. Tee,
5. Fuel injection line,
6. Fuel drain line,
7. Vacuum tube,
8. Vacuum stop unit,
9. Fuel lines,
X114. Immobilizer wiring connector,
Y30. Electronic shut-off valve.
4. Disconnect fuel lines 9 from the fuel filter, check the seals.
5. Disconnect the supply 5 and drain 6 fuel lines from the tee 4.
6. Disconnect vacuum tube 7 from vacuum stop unit 8.
7. Disconnect connector 32 (see figure 4.64).
Figure 4.64 a. High pressure fuel pump:
30, 32. Wiring connector,
31. Vacuum control valve,
S70. Micro switch.
Figure 4.64 b. High pressure fuel pump
8. Disconnect connector X114 from the RCD electronic blocking valve (only on cars with immobilizer).
9. Disconnect the fuel lines from the high-pressure fuel pump.
10. Disconnect the vacuum tube 18 from the compressed air supply unit 17 (see figure 4.65).
Figure 4.65. High pressure fuel pump:
1. Connecting lever,
10. Chain tensioner,
11. Central bolt,
12, 25. Gasket,
13. Spring washer,
14. Centering sleeve,
15, 21. Bolt,
16. Key,
17. Air supply unit,
18, 20. Vacuum tube,
19. Vacuum unit of the PISI system,
22. Bracket,
23, 27. Omentum,
24. Square nut,
26. High pressure fuel pump,
28. Cork,
29. Locking bolt,
X120. Idle speed actuator wiring connector,
Y56. Idle speed control solenoid valve.
11. Disconnect the vacuum tube 20 from the vacuum unit 19 PISI (only on engines with PISI system).
12. Disconnect the X120 wiring connector from the Y56 idle speed control solenoid valve (only on engines with electronic idle speed control).
13. Unscrew bolt 21 from bracket 22.
14. Install the centering sleeve 14.
15. Unscrew the central bolt 11 and remove it together with the gasket 12 and spring washer 13.
16. Remove chain tensioner 10.
17. Unscrew bolt 15 securing the high-pressure fuel pump to the flange and remove it together with square nuts 24. The lower bolt 15 cannot be removed (arrow), and the upper one can only be removed by lifting the engine.
18. Remove fuel injection pump 26.
19. Disconnect connecting rod 1 from the fuel injection pump rack.
20. Disconnect the fuel lines from the high-pressure fuel pump.
Installation
21. Connect the fuel lines to the injection pump. Check the seals, replace if necessary.
22. Lock the high-pressure fuel pump 26 before installation using bolt 29, observing the distance (arrow) between the nut and the bolt.
23. Check that the piston of the first cylinder is set to the 15° after BDC position.
24. Install the high-pressure fuel pump 26 and screw it to the flange. Replace oil seal 23 and lubricate it with oil before installation.
25. Remove locking bolt 29 and tighten plug 28. Replace oil seal 27.
26. Install the timing chain tensioner 10.
27. Tighten the central bolt 11 with the gasket 12 and spring washer 13.
28. Remove centering sleeve 14.
29. Install connecting rod 1.
30. Attach the remaining components removed from the engine. The injection system is bled automatically.
[Article was obtained from the portal MercedesMan.ru]
31. Check the start of fuel supply.
32. Check the idle speed and adjust it if necessary.