SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | 4-cyl. injection engine. (1.6ltrs., 2 valves) | Engine cylinder head, valve gear | Cylinder head

Checking compression

Special tools and workshop equipment required

t	Torque spanners -SAT 8010-

t	spanner -T20028-

t	Compression tester -V.A.G 1763- or -V.A.G 1381-

Checking conditions

l	Engine oil temperature, min. 30 °C

l	Min. battery voltage 11.5 V

Test sequence

–	Remove fuse 25.

Note

Removing fuse No. 25 interrupts the voltage supply to the injectors.

–	Remove air filter → Fig..

–	Remove spark plugs with tool -T20028-.

–	Pull 3-pin connector off Hall sender -arrows-.

–	Pull 4-pin connector off ignition transformer -arrow-.

–	Ask another operator to press the accelerator to the floor, so the throttle valve is completely open.

–	Check compression with compression tester -V.A.G 1763- or -V.A.G 1381-.

Note

–	Operate starter until tester shows no further pressure increase.

Compression pressure:

New: 10 … 15 bar

Wear limit: 7 bar

Maximum permitted difference between the cylinders: 3 bar

–	Tigthen spark plugs with tool -T20028- to 30 Nm.

Continue assembly in reverse order of the removal procedure

–	Interrogate fault memory → Chapter.

SEAT Workshop Service and Repair Manuals