Audi Workshop Service and Repair Manuals

Checking compression

Special tools and workshop equipment required

t	Spark plug socket and extension -3122 B-

t	Compression tester -V.A.G 1763-

t	Puller -T40039-

Test conditions l  Engine oil temperature at least 30 °C l  Battery voltage at least 12.5 V

Test sequence –  Lift off engine cover -arrows-.

–  Unplug electrical connectors -2- on injectors.   Note Disregard -item 1-.

–  Remove bolts -1-. –  Unplug electrical connectors -2- from ignition coils and move wiring duct clear.

–  Remove ignition coils -2-.   Note Disregard -item 1-.   Note

Use puller -T40039- to remove ignition coils. –  Remove spark plugs with spark plug socket -3122 B-. –  Test the compression pressure with the compression tester -V.A.G 1763-.   Note Using the compression tester → operating instructions. –  Have a 2nd mechanic press down the accelerator pedal completely and simultaneously operate the starter until the pressure no longer increases on the tester display. Compression pressure:

New pressure in bar	Wear limit bar	Permissible difference between cylinders bar
10.0 … 13.0	7.0	3.0 (maximum)

–  Install spark plugs and ignition coils. –  Interrogate and erase the fault memory for engine control unit, as faults are stored when the electrical connectors are unplugged → Vehicle diagnostic tester. Tightening torque

Component	Nm
Spark plugs in cylinder head	30