COMPRESSION, CHECKING
Special tools and workshop equipment required
- Compression Tester V.A.G 1763
Procedure
- Engine oil temperature is approximately 80 °C (176 °F).
- Battery voltage is a minimum of 12.5 volts.
Remove the engine cover. Refer to ENGINE COVER .
Disconnect the connectors from the glow plugs.
Disconnect the connector from the fuel pressure regulator valve -N276- -1- on the cylinder bank 1 (right side) fuel rail.
Scheme 414
In order to reduce the fuel pressure in the fuel rail, start the engine briefly.
Scheme 415
Remove the glow plugs. Refer to one of the following
- «CERAMIC SHEATHED GLOW PLUGS»(ref-498891-S18976521422012083100000) .
- «METAL GLOW PLUGS»(ref-498891-S14468745422012083100000) .
Install the adapter V.A.G 1763/8 instead of the glow plugs and connect the compression tester V.A.G 1763.
Scheme 416
Note. Using the tester, refer to the operating instructions.
Have a second technician operate the starter until the tester does not show the pressure increasing any further.
| Compression Pressure | Bar Pressure |
|---|---|
| New | 28 ••• 33 |
| Wear limit | 21 |
| Difference between cylinders | Max. 5 |
Installation is performed in the reverse order of removal, noting the following
Install the glow plugs. Refer to one of the following
- «CERAMIC SHEATHED GLOW PLUGS»(ref-498891-S18976521422012083100000) .
- «METAL GLOW PLUGS»(ref-498891-S14468745422012083100000) .
Check the Engine Control Module (ECM) Diagnostic Trouble Code (DTC) memory and erase it to clear any faults stored from disconnecting the connectors. Refer to the vehicle diagnostic tester.