Volkswagen Workshop Service and Repair Manuals > Golf Mk4 > Power unit | 4-cylinder injection engine (direct injection) | Engine cylinder head, valve gear | Cylinder head

Checking compression

Special tools and workshop equipment required

t	Spark plug socket and extension -3122 B-

t	Torque wrench -V.A.G 1331-

t	Compression tester -V.A.G 1763-

t	Puller -T10094-

t	Assembly tool -T10118-

Prerequisite

l	Engine oil temperature must be at least 30 °C.

Procedure

–	Remove engine cover.

–	Pull 4-pin connectors off ignition coils with final output stages → Chapter.

–	Unscrew spark plugs with spark plug spanner -3122 B-.

–	Remove fuse 28 for fuel pump.

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

Note

How to use the test unit is described in the respective operating instructions.

–	Operate starter until tester shows no further pressure increase.

Compression pressures

New: 10…15 bar.

Wear limit: 7 bar.

Maximum permissible difference between all cylinders: 3 bar

–	Insert spark plugs using spark plug socket and extension -3122 B- and tighten to 30 Nm.

Further assembly is basically the reverse of the dismantling sequence.

–	Read fault memory, rectify faults as necessary and then clear fault memory → Chapter.

Volkswagen Workshop Service and Repair Manuals