SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | 4 cylinder Injection engine (2.0l, 4V Direct injection, turbocharger and chain control) | Engine cylinder head, valve gear | Cylinder head

Compression test

Special tools and workshop equipment required

t	Spark plug socket and extension -3122 B-

t	Extractor -T40039-

t	Torque wrench -V.A.G 1331-

t	Check compression -V.A.G 1763-

Checking process:

Note

t	Always follow safety precautions → Chapter.

t	Engine oil temperature at least. 30 ℃

t	The battery voltage must be at least 12.7 V.

Proceed as follows:

–	Pull off engine cover → Chapter.

–	Detach electrical connectors -arrows- at ignition coils.

–	Remove ignition coils using puller -T40039-.

–	Unscrew the spark plugs using spark plug spanner -3122 B-.

–	Check compression pressure with compression tester -V.A.G 1763- and adapter -V.A.G 1763/6-.

Note

Using the compression tester: → Operating instructions.

–	Turn over engine until tester shows no further pressure increase.

Compression values:

New pressure in bar	Wear limit in bar	Permissible difference between cylinders in bar
11,0 … 14,0	7,0	3.0 (maximum)

–	Mount the spark plugs, tightening torque → Chapter.

–	Install ignition coils with output stages → Chapter.

Note

Faults will have been stored in the memory when unplugging the connectors. After measurement, consult fault memory and then erase it if necessary.

–	Read fault memory of engine control unit → vehicle diagnosis tester.

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