VALVETRAIN Overview: Notes

WARNING: This page is about a different car, the 2013 Volkswagen Beetle and 2012 Volkswagen Beetle. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

The cylinder head and the cylinder head cover must be replaced together.

Do not start the engine for approximately 30 minutes after installing the camshafts. The hydraulic lash adjusters must seat themselves (otherwise the valves will seat themselves on the pistons).

After working on the valvetrain and roller rocker arms, carefully rotate the crankshaft by hand at least 2 full revolutions before starting to be sure that the valves do not strike the pistons.

Always replace the gaskets and seals.

Fig 1: Identifying Valvetrain Overview

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Exhaust Valve
- Do not grind, only hand lapping is permitted.
- Valve dimensions, refer to VALVE DIMENSIONS .
- Checking the valve guides, refer to VALVE GUIDE, CHECKING .
Cylinder Head
Valve Guide
- Checking, refer to VALVE GUIDE, CHECKING .
Valve Stem Seal
- Removing and installing, refer to VALVE STEM SEALS .
Valve Spring
Spring Plate
Valve Retainers
Roller Rocker Arm with Hydraulic Lash Adjuster
- Do not interchange.
- Lubricate the contact surfaces.
Exhaust Camshaft
- Removing and installing, refer to CAMSHAFTS .
- Checking the axial play, refer to CAMSHAFT AXIAL CLEARANCE, CHECKING .
- Check the radial clearance using Plastigage® (roller rocker arm removed).
- Radial clearance at bearing - 24 mm diameter: 0.024 to 0.066 mm.
- Radial clearance at bearing - 32 mm diameter: 0.030 to 0.051 mm.
- Run out: maximum 0.04 mm.
Cylinder Head Cover
- With integrated camshaft bearings.
- Clean the sealing surface, reworking is not permitted.
- Remove any old sealant residue.
Bolt
- Always replace.
- Tightening sequence and specification, refer to Fig 2.
Ball Stud
- 5 Nm
- With a ball head for the engine cover.
O-ring
- Always replace.
- Lubricate with engine oil.
Sealing Plug with O-ring
- Always replace.
- Oil the O-ring with engine oil.
Intake Camshaft
- Removing and installing, refer to CAMSHAFTS .
- Checking the axial play, refer to CAMSHAFT AXIAL CLEARANCE, CHECKING .
- Check the radial clearance using Plastigage® (roller rocker arm removed).
- Radial clearance at bearing - 24 mm diameter: 0.024 to 0.066 mm.
- Run out: maximum 0.04 mm.
Cap
- Always replace.
- Removing: With the cylinder head cover installed, pierce through one side of the cover with an awl and pry it out.
- Installing: Without sealant, press in 1 to 2 mm using the thrust piece T10174
Intake Valve
- Do not grind, only hand lapping is permitted.
- Valve dimensions, refer to VALVE DIMENSIONS .
- Checking the valve guides, refer to VALVE GUIDE, CHECKING .

Fig 2: Identifying Cylinder Head Cover Tightening Sequence

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Special tools and workshop equipment required

Torque Wrench (5-50 Nm) V.A.G 1331