Remove the hood. If present, unfasten the bracket. Remove engine cover -arrows-. Remove sound insulation underneath by removing crankcase breather hose.
Unplug electrical connectors -2- for glow plugs. Pull out the release pin and unscrew the knurled nut -3- of the central connector of the unit injector module. Other -pos.- are ignored.
Unscrew all glow plugs using a socket wrench -3220-. Screw adapter -VAG 1381/12- in place of glow plug into corresponding cylinder. Check compression with compression tester -VAG 1763-. The second mechanic must rotate the engine with a starter until the increase in pressure on the instrument scale stops.
Compression | bar overpressure |
New | 25,0...31,0 |
Limit wear | 19,0 |
difference between cylinders | Max. 5.0 |
Installation
It is carried out in the reverse order, while it is necessary to install glow plugs. Finally, interrogate the fault memory of the engine control unit and clear it, because Errors have been introduced due to the disconnection of the plug connectors. Tightening torque: Engine compartment cover to bracket: 5.5 Nm.
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