Timing Belt: Testing and Inspection

Toothed Belt Drive Component Overview





1 30 Nm + 90° (1/4 turn) additional turn

• Self-locking

• Replace

2 Washer

3 30 Nm + 90° (1/4 turn) additional turn

• Self-locking

• Replace

4 Tensioning roller

5 Tensioning lever

• Insert washer => [ (Item 6) Washer ]

6 Washer

• For tension lever

7 Toothed belt

• Identify running direction with chalk or felt-tip pen before removal, reversed running direction can cause damage to used toothed belts

• Check for wear

• Do not kink

• Removing, refer to => [ Toothed Belt ] Service and Repair

• Installing (Adjusting valve timing) => [ Installing (Adjusting valve timing) ] Service and Repair

8 45 Nm

9 Exhaust camshaft toothed belt gear

• For cylinder bank 1 (right) with damper

• With camshaft adjuster

• Marking "Auslass"

10 Intake camshaft toothed belt gear

• For cylinder bank 1 (right)

• With camshaft adjuster

• Marking "Einlass"

11 10 Nm

• Self-locking

• Replace

12 Idler roller holder

13 10 Nm

• Self-locking

• Replace

14 Right rear toothed belt guard

15 Idler roller

16 10 Nm

17 10 Nm

18 Mechanical coolant pump

• Removing and installing, refer to => [ Coolant Pump ] Coolant Pump

19 Gasket

• Replace

20 Intake camshaft toothed belt gear

• For cylinder bank 2 (left)

• With camshaft adjuster

• Marking "Einlass"

21 Left rear toothed belt guard

22 10 Nm

• Self-locking

• Replace

23 Exhaust camshaft toothed belt gear

• For cylinder bank 2 (left) without damper

• With camshaft adjuster

• Marking "Auslass"

24 100 Nm

• Use Camshaft Adjuster Gauge (T40030) to loosen and tighten

25 O-ring

• Replace

26 Cap

27 Circlip

28 Toothed belt gear diamond disc

• Replace after removing toothed belt gear

29 Eccentric roller

30 45 Nm

31 Crankshaft toothed belt sprocket

32 Central bolt - 200 Nm +180° (1/2 turn) additional turn

• Replace

• Do not oil lubricate additionally

• Use Locking Pin (T40026) to loosen and tighten

• Install Locking Pin (T40026) => [ Install into hole, if necessary rotate crankshaft very slightly
back and forth to completely center the pin. ] Service and Repair

• Replace after removing diamond disc => [ (Item 28) Toothed belt gear diamond disc ]

• There must be no oil on the contact surface between toothed belt gear, diamond disc and crankshaft

• Only possible to install in one position

• Depending on version with/without thrust washer, refer to => [ Vibration Damper ] Vibration Damper

33 Tensioning device for toothed belt

34 10 Nm