Volkswagen Workshop Service and Repair Manuals > Polo Mk3 > Power unit | 3-cylinder diesel engine | Engine cylinder head, valve gear | Cylinder head

Checking compression

Special tools and workshop equipment required

t	U/J extension and socket, 10 mm -3220-

t	Torque wrench -V.A.G 1331-

t	Adapter -V.A.G 1381/12-

t	Compression tester -V.A.G 1763-

Test prerequisite

l	Engine oil temperature min. 30 °C.

Test procedure

–	Pull off central connector for unit injectors.

–	Remove all glow plugs using 10 mm jointed wrench -3220-.

–	Screw in adapter -V.A.G 1381/12- in place of the glow plugs.

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

Note

Using the compression tester → operating instructions.

–	Operate starter until tester shows no further pressure increase.

Compression pressures:

New pressure in bar	Wear limit bar	Permissible difference between cylinders bar
25.0…31.0	19.0	max. 5.0

–	Install all glow plugs using 10 mm jointed wrench -3220-. Torque setting: 15 Nm.

–	Read fault memory → Chapter.

Note

Disconnecting the central connector for unit injectors causes faults to be stored. Therefore read and erase fault memory.

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