Models 463.323 (M612)
Fuel injection pump installation details (M612)
1 - Pressure line; 2 - Fuel injection pump; 3 - Threaded nipple; 4, 5 - Brackets; 6 - Fuel return line; 7 - Clamps; 8 - Bolts; 9 - Drive element; 10 - Sealing ring
1. Remove the cylinder head cover trim panels.
2. Remove the accessory drive belt (see Chapter Engine).
3. Unbolt the pressure line (1) from the high-pressure fuel pump (2) - do not loosen the threaded nipple (3), which should be held from turning with a second key. Disconnect the bracket (4) from the lifting eye of the power unit.
4. Remove the bracket (5) from the pump assembly (2).
5. Loosen the fastening clamps (7) and move the fuel return lines (6) to the side.
6. Disconnect the return line (6) from the high-pressure fuel pump (2) - prepare to collect any spilled fuel.
Note: The sealing ring must be replaced without fail.
7. Unscrew the bolts (8) and remove the fuel injection pump assembly (2).
Attention! The high-pressure fuel pump cannot be disassembled! If necessary, the drive element (9) can be removed from it (prepare a replacement sealing ring (10).
8. Installation is carried out in the reverse order. Do not forget to replace the sealing elements, ensure that the mating surfaces are clean and that the drive element (9) is seated correctly.
Note: The worn drive element (9) is replaced together with the intermediate sprocket of the fuel injection pump drive.
9. Finally, clear the memory of the on-board diagnostic system processor (see Chapter Engine electrical systems).
Models 463.333 (M628)
Fuel injection pump installation details for M628 engine (1 of 2)
1 - Fuel injection pump; 2 - Fuel supply line; 3 - Pressure line of the high-pressure fuel pump; 3a - Threaded nipple; 4 - Fuel return line; 5 - Bolt; 6 - Floating injection advance clutch; 7 - Sealing ring; 8 - Bolt; 9 - Pre-fuel pump; 10 - Drive element; 11 - Sealing ring; 12 - Bolt; Y94 - Mixture quality control valve
(Full article available on the resource: «Mercedesman.ru»)
Fuel injection pump installation details for M628 engine (2 of 2)
1 - Fuel injection pump; 6 - Floating injection advance clutch; 13 - Intermediate sprocket of the fuel injection pump drive with a centrifugal corrector; 14 - Nest
1. Remove the air cleaner and throttle actuator with the upper air ducts (see Section Servicing air intake tract components).
2. Unbolt the pressure line (3) and the fuel return line (4) from the high-pressure fuel pump (1) - prepare replacement sealing elements (cone and ring).
Note: The threaded nipple (3a) should be held from turning using a second key.
3. Disconnect the communication line (arrow) from the mixture quantity control valve (Y94).
4. Unscrew the bolts (5) and remove the fuel injection pump assembly (1).
Attention! Do not open the fuel injection pump assembly - if necessary, remove the floating coupling (6)!
5. Assess the degree of wear of the coupling (6), if necessary, replace it (assembled with the intermediate gear of the high-pressure fuel pump and the centrifugal corrector (13)).
6. Installation is carried out in the reverse order - make sure that when installing the fuel injection pump, the socket (14) of the intermediate sprocket is turned in the same direction as the zero mark (arrow). Do not forget to replace the tensioner sealing element. Do not forget to replace all sealing elements, ensure that the mating surfaces are clean.
7. Finally, clear the memory of the on-board diagnostic system processor (see Chapter Engine electrical systems).