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

t  Vehicle diagnostic, testing and information system -VAS 505X-, see equivalent → Anchor t  Diagnosis line 3m with voltage supply -VAS 5051/1-and diagnosis 5m without voltage supply -VAS 5051/3-

Operation process l  Engine oil temperature, approx 80 ℃. l  Battery voltage at least 12.5 V. –  Disconnect the engine cover-arrow-.

–  Separate the electrical connector of the fuel pressure regulating valve -N276--arrow- on the fuel rail. –  Start the engine briefly in order to reduce the fuel pressure in the fuel rail. –  Remove all glow plugs → Chapter.

–  Screw in adapter -V.A.G 1763/8- in place of the respective glow plug and connect the compression pressure tester -V.A.G 1763-.   Note Use of the testing equipment → Instructions. –  Have a second mechanic operate the starter until the 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 Installation is carried out in the reverse sequence; note the following: –  Install glow plugs → Chapter. –  Certain entries will be stored in the engine control unit if several electrical connectors have been unplugged and the engine started: In the vehicle self-diagnosis read out the event memory → Vehicle diagnostic tester.