SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | 4 cylinder 2.0 litre 4V Common rail TDI engine (2nd generation) | Engine cylinder head, valve gear | Cylinder head

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	Compression pressure gauge -V.A.G 1763- with Adaptor -V.A.G 1763/8-, see equivalent → Anchor

Operation process

l	Engine oil temperature, approx 80 ℃.

l	Battery voltage min. 12.5 V

–	Remove engine cover panel -arrows-.

–	Unplug electrical connector -arrow- for fuel pressure regulating valve -N276- at fuel rail.

–	Briefly start engine to relieve fuel pressure in fuel rail.

–	Remove all glow plugs → Chapter.

–	Screw in adapter -V.A.G 1763/8- in place of corresponding glow plug and connect compression tester -V.A.G 1763-.

Note

Using the compression tester → Operating instructions.

–	Have a 2nd mechanic operate starter until tester shows no further pressure increase.

–	Repeat procedure on each cylinder.

Compression pressure	bar
When new	25,0 … 31,0
Wear limit	19,0
Maximum difference between cylinders	5,0

Assembling

Reassembly is carried out in the reverse order; note the following:

–	Install glow plugs → Chapter.

–	Events will be stored in the engine control unit if electrical connectors have been unplugged and the engine started: Interrogate event memory in Vehicle self-diagnosis → Vehicle diagnostic tester.

SEAT Workshop Service and Repair Manuals