SEAT Workshop Service and Repair Manuals

Checking compression Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter.

Special tools and workshop equipment required

t	Spanner -3122B-, see equivalent → Anchor

t	Compression tester -VAG 1763-, see equivalent → Anchor

t	Extraction tool -T40039-, see equivalent → Anchor

Test requirements l  Engine oil temperature: minimum 30 ℃ l  Battery voltage: minimum 12.5 V Operation process

–  Release quick fasteners -arrows- and remove engine cover panel.

–  Unplug electrical connectors -2- on injectors.   Note Disregard -item 1- and -item 3-.

–  Unscrew the earth wire -2-. –  Unplug the electrical connectors -3- and move wiring clear. –  Pull out ignition coils -1-.   Note

Remove ignition coils using the extractor -T40039-. –  Unscrew the spark plugs using spark plug spanner -3122B-. –  Check compression with the compression tester -VAG 1763-.   Note Handling the test equipment → instructions for use –  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 (overpressure in bar)	Wear limit bar positive pressure	Difference between the cylinders (overpressure in bar)
9,0 … 14,0	7,5	3.0 (maximum)

–  Fit spark plugs and ignition coils.   Note Renew gaskets for ignition coils if damaged. –  As a final step, interrogate and erase engine control unit fault memory, as unplugging the connectors causes faults to be stored → Vehicle diagnostic, testing and information system VAS 5051. Tightening torque

Component	Nm
Spark plugs in cylinder head	30