Compression Check: Testing and Inspection

Compression Pressure, Checking

Special tools, testers and auxiliary items required

• Hinged Socket (3220)

• Compression Tester (V.A.G 1763)

• Adapter (V.A.G 1763/8)

• Torque Wrench (5-50 Nm) (V.A.G 1331)

Conditions

• The engine oil temperature is a minimum of 30 °C (86 °F).

Sequence

- Remove the glow plug for each cylinder using the hinged socket (3220). Refer to => [ Glow Plugs ] Service and Repair.

- Install the adapter (V.A.G 1763/8) in place of the glow plug.

- Check the compression pressure using the compression tester (V.A.G 1763).

• Using the tester, refer to the operating instructions.

- Start the engine until the tester shows no further pressure increase.

Compression pressure:

New: 25 to 31 bar pressure

Wear limit: 19 bar pressure

Permissible difference between all cylinders:

5 bar

- Install the glow plugs using the hinged socket (3220). Refer to => [ Glow Plugs ] Service and Repair.

- Check the Engine Control Module (ECM) Diagnostic Trouble Code (DTC) memory. Refer to the vehicle diagnostic tester.

• By disconnecting the fuel injector connectors, faults will be stored in the ECM. Query the fault memory and erase, if necessary. Refer to the vehicle diagnostic tester.