High Pressure Pump

High Pressure Pump

Special tools, testers and auxiliary items required

• Multi-Point Socket (T10347)

• Socket 14 mm (3150)

Removing

- Disconnect the coolant hoses - 1 and - from the intake manifold.





CAUTION!
• Follow the safety measures for releasing the high side fuel pressure. Refer to => [ High Side Pressure, Releasing ] High Side Pressure, Releasing.

• The fuel pipes are under pressure! Wear protective goggles and protective clothing to prevent injuries and contact with skin. Before loosening the fuel pipe, place a cloth around the connection point. Then release pressure by carefully loosening.

- Disconnect the electrical connectors - arrows - and remove the intake manifold runner control valve (N316) - A -.





- Remove the coolant pipe from the intake manifold - arrows -.





- Remove the low pressure hose - 1 - and high pressure line - 2 -. When doing this, counter hold on the connection for the high pressure pump using a wrench.





- Disconnect the connector - A - and remove the bolts - arrows -.





- Push the coolant hoses and the coolant pipe to the side and remove the high pressure pump - B -.

Installing

- Check the pump plunger - item 17 -=> [ Pump Plunger ] Fuel Rail, Injectors and High Pressure Pump Overview for damage, replace if necessary.

- Insert the lubricated pump plunger - 1 - with guide - 2 - perpendicularly into the cylinder head.





- Rotate the engine at the vibration damper slowly in engine rotation direction. When doing this, press the plunger in the - direction of the arrow - until it reaches the deepest point in the cylinder head.

- Replace high pressure pump O-ring.

- Install the high pressure pump and evenly tighten the bolts - arrows -.





Further installation is performed in the reverse order of removal, noting the following:

CAUTION!
The low pressure hose must always be replaced because it is damaged when it is removed from the ridged connections.

• Tightening specifications, refer to => [ Fuel Rail, Injectors and High Pressure Pump Overview ] Fuel Rail, Injectors and High Pressure Pump Overview.

• Before installing the fuel lines, first tighten the fuel line connections on the high pressure pump.

• High pressure line connection: 40 Nm

• Low pressure line connection: 28 Nm

• Tighten the union nuts of the fuel lines first by hand and then to specifications.