Knock Sensor: Service and Repair

WM 287219 Removing and installing knock sensors

Preliminary work

1. Remove the thermostat housing for both front knock sensors (sensor for cylinders 1 and 2 as well as sensor for cylinders 5 and 6) -> 195519 Removing and installing housing for coolant regulator - section on "Removing" Service and Repair.
2. Remove the starter for both rear knock sensors (sensor for cylinders 3 and 4 as well as sensor for cylinders 7 and 8) -> 276019 Removing and installing starter - section on "Removing" Service and Repair.

Removing knock sensor

1. Observe and note installation position of knock sensors.
Pull off cable plugs -a- ( -arrow- ). => Pulling off cable plug





Pulling off cable plug

2. Unscrew fastening screw -2- and remove knock sensor -1- from the crankcase.





Knock sensors





Installing knock sensor

Information

- The tightening specifications for the basic engine are stored centrally. -> 1001IN Tightening torques, tightening sequences, assembly overviews [1][2]Specifications. Tightening torques and assembly instructions for other assemblies (e.g. chassis, electrics, transmission or body) or for peripheral engine equipment can be found in the corresponding documents.

Information

- Clean contact surface of knock sensor with a cloth.

1. Install knock sensors -1-. Make sure that the knock sensors are aligned as shown in the illustration.





Knock sensors





Information

- Observe the specified tightening torque for the knock sensor screw.

- Align the housing and cable plug for the knock sensor in such a way that they are not touching.

- Otherwise, there is no guarantee that the knock sensor will work correctly.

2. Tighten fastening screws -2- ().
3. Push on cable plug.

Subsequent work

1. Install the thermostat housing for both front knock sensors (sensor for cylinders 1 and 2 as well as sensor for cylinders 5 and 6) -> 195519 Removing and installing housing for coolant regulator - section on "Installing" Service and Repair.
2. Install the starter for both rear knock sensors (sensor for cylinders 3 and 4 as well as sensor for cylinders 7 and 8) -> 276019 Removing and installing starter - section on "Installing" Service and Repair.