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Fuel preparation system Diesel injection > < Checking the charge-air system for leaktightness

Octavia Mk2

Inspect vacuum setting element and tension rods for charge pressure control
Inspect vacuum setting element and tension rods for charge pressure control
Special tools and workshop equipment required
t  Hand vacuum pump, e.g. -VAS 6213-
Faults at tension rods or at vacuum setting element of charge pressure control lead to the following faults:
t  Specified values for charge pressure are not reached.
t  Poor performance.
t  Irregular performance in the partial load region.
t  Engine jerk in change-over.
Test sequence
l  Check vacuum piping for tightness and completeness → Chapter.
l  Charge-air system was checked for tightness → Chapter.
–  Remove engine cover → Chapter.
   
–  Connect the connecting hose -2- to the vacuum setting element and to the hand vacuum pump -VAS 6213-.
–  Slide the sliding ring -1- of the hand vacuum pump -VAS 6213- in the -direction of arrow- for „vacuum“.
  Note
For the following test a second mechanic is required.
–  Generate vacuum with the hand vacuum pump -VAS 6213- and observe the tension rod of exhaust turbocharger.
  Note
For the inspection use a mirror.
  S21-0141
Nominal values:
l  At a vacuum of 0.005...0.012 MPa (0.05…0.120 bar) the tension rod must move up.
l  At a vacuum of 0.055...0.062 MPa (0.550…0.620 bar) the tension rod must rest at the top against the stop.
–  Remove the connecting hose from the hand vacuum pump -VAS 6213- and at the same time observe the tension rod over the entire adjustment range.
l  The tension rod must move without jolting over the entire adjustment range.
If the specified values are not achieved or the tension rod moves with jolt:
–  Replace exhaust turbocharger → Chapter.
  Note
t  If the measuring accuracy of the vacuum using the hand vacuum pump -VAS 6213- is not adequate, the turbocharger tester, e.g. -V.A.G 1397 A-, can be used for a more precise measurement. -V.A.G 1397 A-.
t  Connection of the turbocharger tester → Operating instructions.
  A23-0150

Fuel preparation system Diesel injection > < Checking the charge-air system for leaktightness