Compression Check: Testing and Inspection

Compression, Checking

Special tools, testers and auxiliary items required

• Hinged Socket (3220)

• Compression Tester (V.A.G 1763) with Adapter (V.A.G 1763/8)

Procedure

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

• Battery voltage at least 12.5 V.

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






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






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

- Remove all the glow plugs.






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






• Using the tester operating instructions.

- Have a second technician operate the starter until the test stops showing an increase in pressure.

- Repeat procedure on each cylinder.






Assembling

Assemble in reverse order of disassembling. Note the following:

- Install the glow plugs.

- If electrical connectors were disconnected and the engine was started, then malfunctions have been stored in the engine control module. "Check the DTC memory" in "OBD" -> vehicle diagnostic tester.