Audi Workshop Service and Repair Manuals

Checking vacuum unit for turbocharger Special tools and workshop equipment required

t  Hand vacuum pump -VAS 6213-

Procedure l  Hose from turbocharger via charge pressure solenoid valve -N75- to vacuum unit must be airtight and unobstructed. l  Charge pressure control solenoid valve -N75- OK. –  Remove air cleaner housing → Rep. Gr.24.

–  Remove bolts -arrows- and detach heat shield for turbocharger.

–  Disconnect vacuum hose -arrow- at vacuum unit on turbocharger and attach hand vacuum pump -VAS 6213- instead.

–  Move adjuster ring -1- on hand vacuum pump -VAS 6213- to position -B- to select “pressure”. –  Operate hand vacuum pump -VAS 6213- several times.   Caution Risk of damage to vacuum unit on account of excessive pressure. The pressure must not exceed 800 mbar.   Note

Illustration shows installation position with turbocharger removed. –  Observe operating rod -1- of vacuum unit for turbocharger. l  The operating rod should move at a pressure of approx. 300 mbar and above. l  The operating rod should be at its end position at a pressure of approx. 800 mbar.

–  Vent hand vacuum pump -VAS 6213--arrow A-. l  The operating rod should move in the opposite direction.   Note Observe the movement of the operating rod over the complete range of travel. It should move steadily and smoothly. Assembling l  Tightening torques → Chapter, → Chapter, → Fig.. Installation is carried out in the reverse order; note the following: –  Install air cleaner housing → Rep. Gr.24.