Volkswagen Golf Service & Repair Manual: Checking compression
| Special tools and workshop equipment
required |
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| Spark plug socket and extension -3122 B- |
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| Compression tester -V.A.G 1763- |
| 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. |
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|
| – |
Release hose clips -1- and
-2-, and remove air pipe. |
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|
| – |
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. |
|
|
|
| Compression pressures |
bar |
| New |
10.0 … 15.0 |
| Wear limit |
7.0 |
| Maximum difference between
cylinders |
3.0 |
| Installation is carried out in the reverse order; note the
following: |
| – |
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. |
| → Chapter „Assembly overview - ignition system“ |
|
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|
Removing
–
Remove coolant pump
→ Chapter.
–
Remove air filter housing
→&nbs ...
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Removing and installing camshaft housing
Valve gear