Compression Check: Testing and Inspection

Compression, checking
Special tools, testers and auxiliary items required





^ Jointed wrench 3220
^ Torque wrench (5 ... 50 Nm) V.A.G. 1331
^ Adapter V.A.G. 1381/12
^ Compression tester V.A.G. 1763

Requirements
- Engine oil temperature at least 30°C

Work sequence

- Remove engine cover.





- Disconnect central connector for unit injectors - 1
- Pull connector strip - 2 - off glow plugs.

- Remove all glow plugs - 3 - using jointed wrench 3220.





- Screw in adapter V.A.G. 1381/12 in place of glow plugs.
- Check compression using compression tester V.A.G. 1763.

Note: Using compression tester, Refer to Tester operating instructions.

- Operate starter until tester shows no further pressure increase.

Compression pressures
^ New- 25 ... 31 bar
^ Wear limit- 19 bar
^ Permissible difference between all cylinders- 5 bar

- Install glow plugs with jointed wrench 3220. Tightening torque- 15 Nm
- Read fault memory.

Note: Disconnecting the central connector for unit injectors causes faults to be stored. Therefore read and erase fault memory.