VALVETRAIN Overview

WARNING: This page is about a different car, the 2015 Volkswagen Beetle, 2014 Volkswagen Beetle, and 2013 Volkswagen Beetle. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Risk of damaging valves and piston heads after working on valve train.

The motor must not be started for about 30 minutes after installing camshafts because the hydraulic equalization elements must seat themselves.
To ensure valves do not strike pistons when starting, carefully rotate the crankshaft at least two turns.

NOTE: Cylinder heads with cracks between the valve seats can continue to be used without reducing service life, as long as the tears have a width of maximum 0.5 mm.

Fig 1: Identifying Valvetrain Overview

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Valve
- Do not rework, only grinding is permitted
- Mark the installed position for installation later
- Checking. Refer to VALVES, CHECKING .
- Valve dimensions. Refer to VALVE DIMENSIONS .
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING .
Cylinder Head
- Removing and installing. Refer to CYLINDER HEAD .
Valve Stem Seal
- Replacing with the cylinder head installed. Refer to VALVE STEM SEAL, REPLACING, CYLINDER HEAD INSTALLED .
- Replacing with the cylinder head removed. Refer to VALVE STEM SEAL, REPLACING, CYLINDER HEAD REMOVED .
Valve Spring
Valve Spring Retainer
Valve Keepers
Cover
- Replace
- Removing: with the guide frame installed, pierce through one side of the cover with an awl and pry it out.
- Installing: install without sealing compound and thrust piece
- Depth 1 to 2 mm
Shaft Seal
- Replacing. Refer to CAMSHAFT SEAL .
Exhaust Camshaft
- Removing and installing. Refer to CAMSHAFT .
- Axial Play, Measuring. Refer to CAMSHAFT, MEASURING AXIAL CLEARANCE .
- Radial play, measuring. Refer to CAMSHAFT, MEASURING RADIAL CLEARANCE .
Bolt
- Tightening specification and sequence, refer to Fig 2.
Guide Frame
- With integrated camshaft bearings
- Tightening specification and sequence, refer to Fig 2.
Intake Camshaft
- Removing and installing. Refer to CAMSHAFT .
- Axial Play, Measuring. Refer to CAMSHAFT, MEASURING AXIAL CLEARANCE .
- Radial play, measuring. Refer to CAMSHAFT, MEASURING RADIAL CLEARANCE .
Roller Rocker Lever
- Mark the installed position for installation later
- Check roller for easy movement
- Lubricate the running surfaces before installing
Clip
- For hydraulic adjuster
Hydraulic Adjusting Element
- Mark the installed position for installation later
- Lubricate the running surfaces before installing

Fig 2: Identifying Bearing Frame Bolts/Nuts Tightening Sequence

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Tighten the bolts in two steps in the sequence shown.

Stage	Bolts	Tightening specification
1.	-1- through -24-	Install the bolts all the way in by hand The guide frame must touch the entire contact surface on the cylinder head.
2.	-1- through -24-	10 Nm