Models 463.323 (M612)
Highway
Details of the installation of the fuel distribution line (M612)
1 - Pressure line support bracket; 19/1 - High pressure pump pressure line; 21 - Fuel line; 21/3 - Oil drain line; 21/4 - Fuel return line; 21/6 - Fuel lines for injectors; 22 - Fuel return line from the cooler; 23 - O-rings; B4 / 6 - Fuel line pressure sensor; Y74 - Pressure control valve
1. Remove the cylinder head cover trim panels.
2. Disconnect wiring from sensor (В4/6) and pressure control valve (Y74).
3. Remove fuel injector lines (21/6).
4. Disconnect from the fuel line (21) pressure (19/1) and return (21/4) lines, - use a second wrench to hold the flare nut from turning.
5. Remove the fuel return line from the cooler (22) and oil return line (21/3), - prepare replacement sealing rings.
6. Remove the fuel line (21), if necessary, remove the injectors (see below).
7. Installation is carried out in the reverse order - do not forget to replace the sealing elements.
8. Finally, start the engine and check the fuel path components for signs of leak development, clear the memory of the on-board self-diagnosis module (see chapter Engine Electrical Systems).
Nozzles
Details of installation of nozzles (M612)
1. Remove the cylinder head cover trim panels (7 and 8).
2. Disconnect from injectors (Y76) wiring.
3. Remove the fuel lines (1).
4. Release the latches (2) and remove the oil return line (3), - use a ring wrench with a split head.
5. Release the latches (2) and disconnect the oil return line (3), - clamps (2) must be replaced without fail.
6. Remove the clips (4) and remove the injectors (Y76).
7. Installation is carried out in the reverse order - do not forget to replace the sealing elements.
8. Finally, start the engine and check the fuel path components for signs of leak development, clear the memory of the on-board self-diagnosis module (see chapter Engine Electrical Systems).
Models 463.333 (M628)
Highway
Details of the installation of the fuel distribution line (M628)
1 - Air cleaner; 2 - Bolts; 19/1 - Pressure line / valve block / fuel line; 21 - Fuel line; 21/6 - Fuel lines for injectors
1. Remove the air cleaner (see Section Servicing Air Inlet Components).
2. Remove fuel injector lines (21/6) and pressure fuel line (19/1).
3. Turn out bolts (2) and remove the fuel line (21).
4. Installation is carried out in the reverse order - tighten the fixing bolts only after installing the pressure lines.
5. Finally, start the engine and check the fuel path components for signs of leak development, clear the memory of the on-board self-diagnosis module (see chapter Engine Electrical Systems).
Nozzles
Details of installation of nozzles (M628)
1 - Screw; 2 - Cover; 3 - Screw; 4 - Inlet air duct of the boost path; 5 - Screw; 6 - Fuel injector line; 7 - Retainer; 8 - Oil drain line; 9 - Screw; 10 - Retainer; 11 - O-ring; Y76 - Nozzle
1. Remove the air cleaner (see Section Servicing Air Inlet Components).
2. Remove the air intake assembly with the MAF sensor (see Section Servicing Air Inlet Components).
3. Loosen and move aside the left intake duct (4) (see Section Servicing Air Inlet Components).
4. Remove the right and left nozzle covers (2).
5. Disconnect the wiring and fuel lines from the injectors (6).
6. Release the latches (7), then remove and lay aside the oil return line (8).
Attention! The fasteners must be replaced without fail!
7. Remove the clips (10) and remove the injectors (Y76).
8. Installation is carried out in the reverse order - do not forget to replace the sealing elements.
9. Finally, start the engine and check the fuel path components for signs of leak development, clear the memory of the on-board self-diagnosis module (see chapter Engine Electrical Systems).