High Pressure Pump

High Pressure Pump

Special tools, testers and auxiliary items required

• Multi-Point Socket (T10347)

Removing

- Disconnect the coolant hoses - 1 and 2 - from the intake manifold.





- Loosen the bolts - 1 - and remove the bolt - 2 -.





- Remove the coolant pipe from the intake manifold.

• The coolant hoses remain connected.

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

• 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 the union nut.

- Lay a cloth around threaded connection and loosen the union nut - arrow - from the fuel supply hose. To do so, counter hold the fuel supply line using a wrench.





- Disconnect the connectors - arrows - and remove the low pressure line - 1 - and high pressure line - 2 -. When doing this, counter hold the connections of 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:

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

• The O-ring for the high pressure pump must always be replaced.

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

• High pressure line connection: 40 Nm.

• Low pressure line connection: 28 Nm.

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