Skoda Workshop Service and Repair Manuals > Fabia Mk1 > Drive unit | 1.0/37; 1.4/44; 1.4/50 kW MPI engine | Engine cylinder head, valve gear | Repairing cylinder head

Testing the compression

Test conditions

l	Engine oil temperature at least 30 °C

Special tools and workshop equipment required

t	Compression tester, e.g. -V.A.G 1381- or -V.A.G 1763-

t	Spark plug wrench, e.g. -3122 B-

Test sequence

–	Remove engine cover.

–	Unplug 4-pin connector -arrow- from the ignition terminal.

–	Remove the fixing screws of the ignition terminal and detach ignition terminal from the park plugs.

–	Release spark plugs with spark plug wrench, e.g. -3122 B-.

–	Remove fuse 35.

Note

Removing fuse 35 interrupts the voltage supply of the injectors.

–	Have a second mechanic fully depress the accelerator pedal.

–	Use compression tester, e.g. -V.A.G 1381 - or -V.A.G 1763- to test compression pressure.

Note

–	Operate starter until the tester no longer indicates a pressure rise.

Compression readings

New engine	Wear limit	Difference between cylinders
min. 12 bar (1.2 MPa)	7.5 bar (0.75 MPa)	max. 3 bar (0.3 MPa)

–	Plug connectors into the ignition strip.

–	Install spark plugs, ignition terminal, fuse 35 and engine cover.

–	Interrogate fault memory and erase → Vehicle diagnosis, testing and information system VAS 5051.

Note

Separating the plug connections causes faults to be stored.

Tightening torques

Component	Nm
Spark plugs in cylinder head	30
Ignition terminal to bracket	9

Skoda Workshop Service and Repair Manuals