Valvetrain Assembly Overview

Valvetrain Assembly Overview






1 100 Nm

• Use counter-holder (3415) to loosen and tighten

2 Camshaft sprocket

3 Seal

• Removing and Installing, refer to => [ Camshaft Seal, Removing and Installing ] Service and Repair.

4 Woodruff key

• Make sure it is secure

5 20 Nm

6 Bearing cap

• Installed location => [ Installed position of camshaft bearing caps ]

• Installation order => [ Camshaft, Removing and Installing ] Service and Repair

• Coat the contact surface on bearing cap 1 with sealant (AMV 174 004 01).

7 Camshaft

• Checking axial play => [ Camshaft, Checking Axial Play ]

• Removing and Installing, refer to => [ Camshaft, Removing and Installing ] Service and Repair

• Check radial clearance with Plastigage

Wear limit: 0.1 mm run-out: max. 0.05 mm

8 Hydraulic valve lifter

• Do not interchange

• with hydraulic valve clearance compensation

• Checking, refer to => [ Hydraulic Valve Lifter, Checking ] Testing and Inspection

• place on running surface when setting down

• Before installing, check axial play of camshafts => [ Camshaft, Checking Axial Play ]

• Lubricate contact surface

9 Valve retainers

10 Top valve spring retainer

11 Valve spring

• Removing and Installing:

• Cylinder head removed: With valve spring compressor (2037)

• Cylinder head installed: => [ Valve Stem Seals, Removing and Installing ] Service and Repair

12 Valve stem seal

• Removing and Installing, refer to => [ Valve Stem Seals, Removing and Installing ] Service and Repair.

13 Valve guide

• Checking, refer to => [ Valve Guides, Checking ] Testing and Inspection

• Removing and Installing, refer to => [ Valve Guides, Replacing ] Service and Repair.

• Repair guide with shoulder

14 Cylinder head

• Resurfacing sealing surfaces => [ Cylinder head - sealing surface, resurfacing ]

• Rework valve seats => [ Valve Seats, Reworking ] Service and Repair

15 Valves

• Do not rework, only grinding is permitted

• For the correct valve dimensions, refer to => [ Valve Dimensions ]

16 Rear toothed belt guard

17 20 Nm

18 Camshaft position sensor (G40)

Cylinder head - sealing surface, resurfacing





Reworking dimension, cylinder head:

• - a - = minimum 132.6 mm

• If the sealing surface is reworked, then place the valves deeper; rework the valve sealing rings. Otherwise the valve will hit up against the pistons. Be careful not to exceed the minimum dimension. Refer to => [ Valve Seats, Reworking ] Service and Repair.

Camshaft, Checking Axial Play





Special tools, testers and auxiliary items required

• Dial gauge holder (VW 387)

• Dial gauge

Test Sequence

- Measure with valve lifters removed and with first and last bearing cap installed.

• Wear limit: 0.15 mm

Installed position of camshaft bearing caps





Observe central alignment.

- Before installing camshaft, set bearing caps in place and determine installation position.

Valve Dimensions





• Valves must not be reworked. Only grinding is permitted.