Compression, Checking

Compression, Checking

Special tools, testers and auxiliary items required

• Compression Tester (V.A.G 1763)

Procedure

• Engine oil temperature approximately 80 °C (176 °F).

• Battery voltage min. 12.5 volts.

- Carefully pull the engine cover off the 4 studs one after the other - arrows -.





- Disconnect the connectors from the glow plugs.

- Disconnect the connector from the fuel pressure regulator valve (N276) - 1 - on the cylinder bank 1 (right) rail.





- In order to reduce the fuel pressure in the rail, start the engine briefly.





- Remove the glow plugs. Refer to one of the following:

=> [ Ceramic Glow Plugs ] Ceramic Glow Plugs.

=> [ Metal Glow Plugs ] Metal Glow Plugs.

- Install the (V.A.G 1763/8) instead of the glow plugs and connect the (V.A.G 1763).





• Using tester, refer to the operating instructions.

- Have a second technician operate the starter until the tester does not show the pressure increasing any further.





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

- Install the glow plugs. Refer to one of the following:

=> [ Ceramic Glow Plugs ] Ceramic Glow Plugs.

=> [ Metal Glow Plugs ] Metal Glow Plugs.

- Check the Engine Control Module (ECM) Diagnostic Trouble Code (DTC) memory and erase it to clear any faults stored from disconnecting the connectors. Refer to the vehicle diagnostic tester.