Skoda Workshop Service and Repair Manuals > Octavia Mk2 > Power unit | 2.0/81; 103; 125 kW TDI CR Engine (2nd generation) | Engine cylinder head, valve gear | Removing and installing the cylinder head

Testing the compression

Note

t	A rough test of the compression pressure can be carried out in the targeted fault finding → Vehicle diagnostic tester.

t	The following work sequence with the compression tester gives more precise values.

Special tools and workshop equipment required

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

t	Adapter, e.g. -V.A.G 1381/12-

t	Hinged wrench -3220-

Test condition

l	Engine oil temperature at least 30 °C.

Test sequence

–	Disconnect the plug -arrow- at the fuel pressure regulating valve -N276-.

–	Remove the glow plug for the relevant cylinder with the hinged wrench -3220- → Chapter.

–	Screw adapter -V.A.G 1381/12- into the threaded hole of the glow plug.

–	Check compression pressure using the compression tester -V.A.G 1763-.

Note

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

Compression readings

New engine	Wear limit	Permissible difference between the cylinders

2.5…3.1 MPa	1.9 MPa	max. 0.5 MPa
25 … 31 bar	19 bar	max. 5 bar

Work procedure after the compression pressure test

–	Re-install the glow plug of the relevant cylinder → Chapter.

–	Connect the plug -arrow- to the fuel pressure regulating valve -N276-.

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

Note

After deleting the fault memory of the engine control unit the readiness code must be checked, if necessary re-generated → Vehicle diagnostic tester.

Skoda Workshop Service and Repair Manuals