SEAT Workshop Service and Repair Manuals

Test compression pressure

Special tools and workshop equipment required

t	Special wrench -T20175-

t	Extractor -T40039-

t	Compression tester -VAG 1763-

Test conditions l  Engine oil temperature at least. 30 ℃ l  Minimum battery voltage 12.7 V

Checking sequence –  Detach engine cover -arrows-.

–  Pull all of the ignition coils out about 30 mm using the extractor -T40039-.

–  Release the connectors -2- and separate the ignition coils at the same time. –  Remove all the ignition coils with output stages, using the extractor -T40039- . –  Remove the spark plugs using the spark plug spanner -T20175-.

–  Remove 8-contact connector from the injectors -1-. –  Ask another mechanic to press the accelerator so that the throttle valve is completely open. –  Check compression with compression tester -V.A.G 1763-.   Note Use of the testing equipment → Instructions. –  Operate starter until pressure reading on tester no longer rises. Compression pressure

Motorkennbuchstaben	new bar pressure	Wear limit bar pressure	Difference between cylinder bar pressure
BLR and BVY	13.0 ... 16.0	8.0	max. 3.0
BLY and BVZ	11.0 ... 14.0	7.0	max. 3.0

–  Fit spark plugs and ignition coils. –  Interrogate fault memory of engine control unit → Chapter.   Note t  Faults will have been stored in the memory because connectors have been unplugged. After measurement, consult fault memory and then erase it if necessary. t  The readiness code must be generated if the fault memory has been erased → Vehicle diagnostic, testing and information system VAS 5051„Guided Functions“.