Volkswagen Workshop Service and Repair Manuals > Golf Mk4 > Power unit | 4-cylinder injection engine (5-valve) | Engine cylinder head, valve gear | Removing and installing cylinder head

Checking compression

Special tools and workshop equipment required

t	Spark plug spanner -3122 B-

t	Torque wrench -V.A.G 1331- (5...50 Nm)

t	Compression tester -V.A.G 1763-

–	Remove fuse 32

Note

Removing fuse 32 interrupts the voltage supply to the injectors.

Test prerequisites

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

l	Voltage supply OK.

Procedure

–	Remove engine cover.

–	Pull connector(s) off ignition coils.

Vehicles with turbocharger

–	Remove ignition coils.

Engine code AGN

–	Pull spark plug connectors off cylinders 1 to 4.

Continuation for all vehicles

–	Remove spark plugs using spark plug spanner -3122 B-.

–	Have a second mechanic operate the starter. (Vehicles with engine code AGN, AGU, AQA, ARZ, additionally depress accelerator pedal fully).

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

Note

–	Operate starter until tester shows no further pressure increase.

Compression pressures:

Permissible difference between all cylinders: max. 3 bar

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

–	Install ignition coils and tighten to 10 Nm.

–	Read fault memory → Chapter.

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