Overview - VALVETRAIN

WARNING: This page is about a different car, the 2017 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 adjusters must seat themselves (otherwise the valves will crash into the pistons).

After working on the valvetrain and lifters, carefully rotate the crankshaft by hand at least two full revolutions to be sure that valves do not strike the pistons when starting.

After removing the camshaft, adjust the chain length. Refer to CHAIN LENGTH, CHECKING .

Fig 1: Exploded View Of Valvetrain

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Exhaust Valve
- Do not rework, only lapping is permitted
- Valve dimensions. Refer to VALVE DIMENSIONS .
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING .
Cylinder Head
Valve Stem Seal
- Replacing. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING .
Valve Spring
Valve Spring Retainer
Valve Retainers
Hydraulic Adjuster
- Do not interchange
- Lubricate contact surface
Clip
- For hydraulic adjuster
Roller Rocker Lever
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Mark the installed position for installation later
- Check the roller bearing for ease of movement
- Lubricate the running surfaces before installing
Exhaust Camshaft
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Check radial clearance using Plastigauge^® (roller rocker lever removed)
- Radial clearance: 0.024 to 0.066 mm
- Run-out: maximum 0.04 mm
Cylinder Head Cover
- With integrated camshaft bearings
- Clean sealing surface, reworking is not permitted.
- Remove old sealant residue.
Bolt
- Tightening sequence. Refer to Fig 3
- Replace after removing
- Loosening. Refer to Fig 2
Intake Camshaft
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Check radial clearance using Plastigauge^® (roller rocker lever removed)
- Radial clearance: 0.024 to 0.066 mm
- Run-out: maximum 0.04 mm
Alignment Pin
Alignment Pin
Intake Valve
- Do not rework, only lapping is permitted
- Valve dimensions. Refer to VALVE DIMENSIONS .
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING .

Loosening the Cylinder Head Cover

Fig 2: Cylinder Head Cover Bolt Loosening Sequence

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Loosen the cylinder head cover in the sequence -1 through 6-.

Cylinder Head Cover, Tightening Specifications and Sequence

Fig 3: Cylinder Head Cover Bolt Tightening Sequence

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Replace the bolts.

Step	Bolts	Tightening Specification/Additional Turn
1.	-1 through 6-	Install hand-tight in several stages
2.	-1 through 6-	8 Nm
3.	-1 through 6-	Turn an additional 90°.