Engine - Blue Exhaust Smoke After Engine Start

Blue smoke from exhaust after engine start

Topic number L109.40-P-055396

Version 1

Design group 09.40 Turbocharger

Date 03-01-2013

Validity Vehicles with engine 271.8 EVO

Reason for change

Complaint:
Shortly after engine start a blue smoke can emerge from the rear muffler of the exhaust system.

Note:

The smoke cloud dissipates and does not necessarily reappear at every restart.

This can occur in some cases when a cold engine is started after the vehicle has been parked for several hours.

Cause:

When the engine is switched off, oil can continue to run out of the cylinder head via the oil feed line and can therefore seep into the bearing housing. In isolated cases capillary action can cause small residual oil quantities to travel to the turbine wheel and the V-clamp (refer to illustration in the attachments for location). After a long idle period this can lead to slight oil leakage at the V-clamp or to blue smoke problems when the cold engine is restarted.





Attachments

Remedy:
The turbocharger is technically OK and does not need to be replaced; it is sufficient to install a new banjo bolt with integral valve.

1.) Detach small shield of turbocharger (see attachment for installation location of bolts).

2.) Remove oil feed line in accordance with WIS document ARO9.40-P-6020-13EVO steps 1, 2 and 3

3.) Replace previous banjo bolt with banjo bolt with integral valve A0019972401. Observe revised tightening torque: 6 Nm + 900

4.) Install in the reverse order

Note:
The banjo bolt must be renewed each time it is removed.








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