Compression Check: Testing and Inspection

Compression, Checking

Special tools, testers and auxiliary items required

• Puller (T10095A)

• Torque wrench (5 to 50 Nm) (V.A.G 1331)

• Compression tester (V.A.G 1763)

• Spark plug removal tool (3122 B)

• Assembly tool (T10118)

Test Conditions

• Engine oil temperature must be at least 30° C.

• Battery voltage must be at least 11.5 V.

• All electrical consumers such as, for example, lights and rear window defroster must be switched off.

• If the vehicle is equipped with an air conditioning system, this must be switched off.

• For vehicles with automatic transmission, selector lever must be in position "P" or "N".

• Fuses - 13 - and - 14 - - arrows - must be removed from their sockets.





Test Sequence

- Remove engine cover.

- Remove ignition coils with power output stage --> [ Ignition Coil with Power Output Stage ] Service and Repair.

- Remove spark plugs using spark plug removal tool (3122 B).

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

• Using the compression tester --> Operating instructions.

- Have a second technician fully depress accelerator pedal and crank engine.

- Operate starter until tester shows no further pressure increase.

Compression Pressure

New: 10 to 13 bar pressure

Wear limit: 7.5 bar pressure

Permissible difference between all cylinders: 3 bar

- Install the spark plugs using the spark plug removal tool (3122B) and tighten to 20 Nm.

After completing installation:

- Connect vehicle diagnosis and service system (VAS 5052).

- Perform vehicle system test "Guided Fault Finding".

- End vehicle system test, this will automatically erase DTC entries which occurred during the assembly.

- Perform test drive.

- Generate readiness code in conjunction with road test.

Observe safety precautions that apply to road tests.

- Then perform vehicle system test again and repair any occurring malfunctions if necessary.