SEAT Workshop Service and Repair Manuals

Checking compression

Special tools and workshop equipment required

t	Spark plug socket and extension -3122 B-

t	Torque wrench (5…50 Nm) -V.A.G 1331-

t	Check compression -V.A.G 1763-

t	Extractor -T10094 A-

Test condition l  Engine oil temperature at least. 30 ℃.

Operation process –  Unplug connector -1-. –  Remove bolts -arrows-. l  Gas hoses remain connected to gas rail. –  Release the wiring from the fixing of the carrier cover and from the gas hoses. –  Place the fuel rail „Gas rail“ aside and fix without removing the cables and hoses.

–  Remove bolts -arrows- and lift the carrier cover upwards and away. –  Remove the air filter housing → Chapter. –  Remove ignition coils → Chapter. Use puller -T10094 A- for this. –  Remove spark plugs using the spark plug socket -3122 B-

–  Remove the fuse holder from the injectors. Fuse installation → Current flow diagrams, Electrical fault finding and Fitting locations –  Get a second mechanic to fully depress the accelerator pedal. –  Check compression with compression tester -V.A.G 1763-.   Note See relevant test unit operating instructions for instructions on how to use compression tester. –  Operate starter until tester shows no further pressure increase. Compression pressure New: 10 … 15 excess pressure wear limits: 7 bar excess pressure Permissible difference between all cylinders: 3 bar –  Fit spark plugs with the plug spanner -3122 B- and tighten to 30 Nm. Further assembly is basically the reverse of the dismantling sequence.

–  Install the carrier cover and tighten the screws -arrows- to a tightening torque of 8.5 Nm. –  Mount the cables and gas hoses on to the fixing points of the carrier cover.

–  Install the fuel rail „Gas rail“ and tighten the screws -arrows- to a tightening torque of 4 ± 0.4 Nm. –  Insert the connector -1-. –  Consult fault memory; if necessary, repair any faults and then erase fault memory → Vehicle diagnostic, testing and information system VAS 5051„guided fault finding“ If the fault memory has been erased, you must generate the readiness code again.