Semi-automatic toothed belt tensioning roller, checking

Engine codes AEG, AVH, AZG, BEV 

Special tools and equipment 

Fig 1: Identifying Special Tool T10020 Two Hole Pin Wrench

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• T10020 Two hole pin wrench

Engine code BBW 

Fig 2: Identifying T10004 Two Hole Pin Wrench

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• T10004 Two hole pin wrench

Fig 3: Locating Angled Retainer & Cut-Out On Cylinder Head

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• Angled retainer (arrow) must locate in cut-out on cylinder head.

Requirements 

• Engine must only be hand touch warm.

Work sequence 

• Position engine at TDC for cylinder No. 1

Engine codes AEG, AVH, AZG, BEV 

Fig 4: Releasing Tension On Toothed Belt Until Notch And Indicator Align (Engine codes AEG, AVH, AZG, BEV)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• With forceful thumb pressure, depress toothed belt. Indicator -2- must move.

Engine code BBW 

Fig 5: Releasing Tension On Toothed Belt Until Notch And Indicator Align (Engine code BBW)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• With forceful thumb pressure, depress toothed belt. Indicator -2- must move.

Continued for all engines 

• Release thumb pressure on toothed belt and turn crankshaft two turns in engine direction of rotation until engine is again at TDC No.1 cylinder. It is essential that last 45 ° (1/8 turn) is performed without stopping.

Tensioning roller must return to its original position. (Notch -1- and indicator -2- are again aligned).