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Repairing valve gear > < Installing

Golf Mk4

Checking compression
   
Checking compression
Special tools and workshop equipment required
t  Spark plug socket and extension -3122 B-
t  Assembly tool -T10029-
t  Torque wrench -V.A.G 1331- (5..50 Nm)
t  Compression tester -V.A.G 1763-

Test prerequisite
l  Engine oil temperature must be at least 30° C.
l  Voltage supply OK.
Procedure
–  Remove engine cover.
   
–  Pull 4 pin connector -1- off output stage for ignition coils -2-.
  N28-0145
–  Remove fuse 28 for fuel pump.
–  Pull off spark plug connectors using assembly tool -T10029-.
–  Remove spark plugs using spark plug tool -3122 B-.
–  Have a second mechanic fully depress the accelerator pedal.
–  Check compression using compression tester -V.A.G 1763-.
  Note
How to use test instrument → operating instructions
–  Operate starter until tester shows no further pressure increase.
Compression pressures
New: 10...13 bar pressure, wear limit: 7.5 bar pressure.
Maximum permissible difference between all cylinders: 3 bar.
  N24-0588

Repairing valve gear > < Installing