VW Golf manuals

Volkswagen Golf Service & Repair Manual: 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“
   
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Valve gear
...

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