Skoda Workshop Service and Repair Manuals > Octavia Mk2 > Power unit | 1,6/72; 75 kW MPI engine | Engine cylinder head, valve gear | Removing and installing the cylinder head

Testing the compression

Special tools and workshop equipment required

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

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

t	Extractor -T10112-

Note

Observe safety measures and rules for cleanliness when working on vehicles with liquefied petroleum gas system (LPG) → Chapter.

Test conditions

l	Oil temperature at least 30 °C.

l	Battery voltage at least 12,7 V.

Test sequence

–	Switch off ignition.

–	Open lid of E-box in the engine compartment and unplug fuses F6 und F32 for ignition transformer and injection valves.

–	If present, remove engine cover -arrows-.

–	Separate the electrical plug connections in the outer injection valves.

–	Use extractor -T10112- to unplug spark plug connector.

–	Unscrew the spark plugs with spark plug wrench.

–	Check compression pressure using the compression tester.

Note

–	Have a second mechanic operate the starter with the throttle valve fully opened until no further pressure rise is indicated by the tester.

Compression readings

Engine new	Wear limit	Difference between cylinders
1.0…1.3 MPa (10…13 bar)	0.7 MPa (7 bar)	max. 0.3 MPa (3 bar)

If the specified values are not reached, test the combustion chamber for tightness → Chapter.

Installation is performed in the reverse order, pay attention to the following points:

After the compression pressure test, the following work steps must be carried out.

–	Interrogating and erasing fault memory of engine control unit → Vehicle diagnostic tester.

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