Skoda Workshop Service and Repair Manuals > Octavia Mk2 > Power unit | 1.4/55; 59 kW MPI engine | Engine cylinder head, valve gear | 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 1763-

t	Extractor -T10094A-

t	Camshaft lock -T10016-

Test requirements:

l	Engine oil temperature at least 30°C

Work procedure

For engine with identification characters BCA

–	Remove engine cover with air filter → Chapter.

–	Removing oil filler inlet → Chapter.

For engine with identification characters BUD, CGGA

–	Remove protective cover → Chapter.

Continued for all vehicles

–	Removing ignition coils → Chapter.

–	Unscrew the spark plugs with spark plug wrench.

–	Remove the fuse for the voltage supply of the injection valves and the ignition coils from the fuse holder → Current flow diagrams, Electrical fault finding and Fitting locations.

Note

Removing the fuses interrupts the voltage supply of the injection valves and the ignitions coils.

–	Check compression pressure using the compression tester.

Note

The use of the tester is described in the relevant operating instructions.

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

Compression readings:

New engine	Wear limit	Difference between cylinders
1…1.5 MPa (10…15 bar)	0,7 MPa (7 bar)	0.3 MPa (3 bar)

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

–	Screw in the spark plug with spark plug wrench and then tighten fully to 30 Nm.

Further installation occurs in reverse order.

–	Interrogate fault memory, rectify any faults existing and erase the fault memory → Vehicle diagnostic, testing and information system VAS 5051.

Skoda Workshop Service and Repair Manuals