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Exhaust turbocharger, G-charger > < Checking for internal leaks

Golf Mk4

Removing and installing tandem pump
Removing and installing tandem pump
  DANGER!
The tandem pump may, under no circumstances, be dismantled as the vacuum part could otherwise malfunction. This would result in the failure of the brake servo.
   
Special tools and workshop equipment required
t  Torque wrench -V.A.G 1331-
t  Hand vacuum pump with accessories -V.A.G 1390-
t  Water drainage container -V.A.G 1390/1-
t  Hose clip pliers -V.A.G 1921-

Removing
   
–  Pull supply hose -1- (white marking) and return hose -2- (blue marking) off fuel filter.
  WARNING
t  The fuel and the fuel lines in the fuel system can become very hot (danger of scalding)!
t  The fuel system is also under pressure! Before opening the system, place cloths around the connections. Then carefully loosen connection to release the pressure!
t  Wear eye and hand protection when performing any type of repair work on the fuel system!
–  Connect hand vacuum pump with accessories -V.A.G 1390- with water drainage container -V.A.G 1390/1- to return hose.
–  Operate hand vacuum pump until no more fuel escapes from return hose. Be careful that no fuel is sucked into hand vacuum pump.
  N20-0293
–  Pull vacuum line -1- from brake servo off tandem pump -4-.
–  Pull supply hose -2- (white marking) off tandem pump -4-.
–  Remove securing bolts -arrows-.
–  Remove tandem pump -4- from cylinder head.
–  Pull tandem pump -4- upwards slightly, pull off return hose -3- (blue marking) and remove tandem pump -4-.
Installing
Installation is carried out in the reverse order. When installing, note the following:
  Note
t  Ensure that tandem pump coupling seats properly in camshaft.
t  Always renew tandem pump seals.
  N15-0254
–  Attach return hose -3- (blue marking) to return connection of tandem pump.
–  Install tandem pump and tighten upper securing bolts to 20 Nm.
–  Tighten lower securing bolts to 10 Nm.
–  Attach supply hose -2- (white marking) to supply connection and vacuum line -1- from brake servo to tandem pump -4-.
  N15-0254
–  Attach supply hose -1- (white marking) to fuel filter.
–  Connect hand vacuum pump with accessories -V.A.G 1390- and water drainage container -V.A.G 1390/1- to return hose -2- (blue marking) of fuel filter.
–  Operate hand vacuum pump until fuel escapes from return hose. Be careful that no fuel is sucked into hand vacuum pump.
–  Connect return hose -2- (blue marking) to fuel filter.
  N20-0293

Exhaust turbocharger, G-charger > < Checking for internal leaks