Valvetrain, Component Overview

Valvetrain, component overview





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

^ Replace

2 - Housing for camshaft adjustment solenoid valve

3 - Gasket

^ Replace

4 - Valve stem seal

5 - Valve spring

6 - Valve spring plate

7 - Valve keepers

8 - Hydraulic valve lifter

^ Pressed into roller rocker lever
^ Not removable without being damaged

9 - Roller rocker lever

10 - Alignment bushing

^ 2 pieces

11 - Double bearing cap

12 - 5 Nm plus an additional1/4 turn (90 degrees)

^ Replace

13 - Oil deflector

^ On cylinder head at right between bearing cap E4 and A4
^ On cylinder head at left between bearing cap E2 and A2

14 - 5 Nm plus an additional 1/4 turn (90 degrees)

^ Replace

15 - Bearing cap

^ Note installation position and allocation

16 - Intake camshaft

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

17 - Exhaust camshaft

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

18 - Shaft for roller rocker lever, intake side

19 - 10 Nm

20 - Shaft for roller rocker lever, exhaust side

21 - O-ring for shaft of roller rocker lever

^ Replace

22 - Cylinder head

^ Check valve guides, grind valve seats
^ Rework valve seats

23 - Intake valve

^ Do not rework, only lapping is permitted
^ Valve dimensions
^ Check valve guides, grind valve seats

24 - Exhaust valve

^ Do not rework, only lapping is permitted
^ Valve dimensions
^ Check valve guides, grind valve seats

25 - Alignment bushing

^ 2 pieces