Valvetrain Component Overview

Valvetrain Component Overview





1 5 Nm plus an additional 90° (1/4 turn)

• Replace

2 Housing for camshaft adjustment solenoid valve

3 Gasket

• Replace

4 Diamond disc

• Replace

5 Valve stem seal

• Replacing => [ Valve Stem Seals ] Removal and Replacement.

6 Valve spring

7 Valve spring plate

8 Valve keys

9 Hydraulic valve lifter

• Pressed into roller rocker lever

• Not removable without being damaged

10 Roller rocker lever

• With hydraulic valve lifter => [ (Item 9) Hydraulic valve lifter ]

• Removing and installing, refer to => [ Roller Rocker Lever ] Service and Repair

11 Alignment bushing

• 2 pieces

12 Double bearing cap

13 5 Nm plus an additional 90° (1/4 turn)

• Replace

14 Oil deflector

• On cylinder head at right between bearing cap E4 and A4

• On cylinder head at left between bearing cap E2 and A2

15 5 Nm plus an additional 90° (1/4 turn)

• Replace

16 Bearing cap

• Note installation position and allocation => [ Installing ] Service and Repair

17 Intake camshaft

• Removing and installing, refer to => [ Camshafts ] Service and Repair

• Checking axial play, refer to => [ Camshafts, Checking Axial Clearance ] Testing and Inspection

• Check radial clearance using Plastigage (roller rocker lever removed) wear limit 0.1 mm run-out max. 0.01 mm

18 Exhaust camshaft

• Removing and installing, refer to => [ Camshafts ] Service and Repair

• Checking axial play, refer to => [ Camshafts, Checking Axial Clearance ] Testing and Inspection

• Check radial clearance using Plastigage (roller rocker lever removed) wear limit 0.1 mm run-out max. 0.01 mm

19 Shaft for roller rocker lever, intake side

• Removing and installing, refer to => [ Roller Rocker Lever ] Service and Repair

20 10 Nm

21 Shaft for roller rocker lever, exhaust side

• Removing and installing, refer to => [ Roller Rocker Lever ] Service and Repair

22 O-ring for shaft of roller rocker lever

• Replace

23 Cylinder Head

• See note, refer to => [ Valvetrain, Servicing ] Valvetrain, Servicing

• Check valve guides, grind valve seats, refer to => [ Valve Guides, Checking ] Testing and Inspection

• Rework valve seats, refer to => [ Valve Seats, Reworking ] [1][2]Specifications

24 Intake valve

• Do not rework, only grinding is permitted

• Valve dimensions, refer to => [ Valve Dimensions ] [1][2]Specifications

• Check valve guides, grind valve seats, refer to => [ Valve Guides, Checking ] Testing and Inspection

25 Exhaust valve

• Do not rework, only grinding is permitted

• Valve dimensions, refer to => [ Valve Dimensions ] [1][2]Specifications

• Check valve guides, grind valve seats, refer to => [ Valve Guides, Checking ] Testing and Inspection

26 Alignment bushing

• 2 pieces