Volkswagen Golf Service & Repair Manual: Checking compression

Volkswagen Golf Service & Repair Manual / 4- cylinder injection engine(1.4 1 direct inction. turbocharger) / Engine cylinder head, valve gear / Cylinder head / Checking compression

Special tools and workshop equipment required

Spark plug socket and extension -3122 B-

Checking compression

Compression tester -V.A.G 1763-

Procedure

Engine oil temperature at least 30 °C.

Battery voltage at least 12.5 V

–	Remove fuse for fuel pump control unit from fuse holder. Fuse assignment → Current flow diagrams, Electrical fault finding and Fitting locations

Note

Removing fuse interrupts voltage supply for fuel pump control unit.

–	Start engine and run it until it turns off.

–	Switch off ignition.

Checking compression

–	Release hose clips -1- and -2-, and remove air pipe.

Checking compression

–	Pull off connector -2- and unscrew bolt -1-.

–	Pull out ignition coils with output stages.

–	Unscrew spark plugs using spark plug socket and extension -3122 B-.

–	Check compression using compression tester -V.A.G 1763-. Refer to → operating manual for information on how to use it.

–	Have a second mechanic press down accelerator completely and simultaneously operate starter until pressure no longer increases on tester display.

–	Repeat procedure on each cylinder.

Checking compression

Compression pressures	bar
New	10.0 … 15.0
Wear limit	7.0
Maximum difference between cylinders	3.0

Reassembly

Installation is carried out in the reverse order; note the following:

–	Install spark plugs.

–	Install ignition coils with output stages → Chapter.

–	Entries are stored in the event memory of the engine control unit because electrical connectors were disconnected and the engine was started: Generate readiness code in Guided functions → Vehicle diagnostic tester.

Specified torques

→ Chapter „Assembly overview - ignition system“

Removing and installing camshaft housing

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Valve gear

...

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