Overview - VALVETRAIN

WARNING: This page is about a different car, the 2021 Volkswagen GTI, 2020 Volkswagen GTI, 2019 Volkswagen GTI, 2018 Volkswagen Golf, and 2018 Volkswagen GTI. 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 equalization elements 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 before starting to be sure that valves do not strike the pistons.

Replace the gaskets and seals.

After performing work on the chain drive the adaptation value in the Engine Control Module (ECM) must be adapted. To do this turn on the ignition and select the following menu items on the Vehicle Diagnostic Tester:

01 - Engine Electronics

Guided Functions

01 - Adaptation After Repair Work On the Chain Drive

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 Adjusting Element
- 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 roller for easy 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
Spring
- No replacement part
Ball
- For sliding bar
- Installing. Refer to SLIDING BAR BALL, INSTALLING .
Cylinder Head Cover
- With integrated camshaft bearings
- Clean sealing surface, reworking is not permitted.
- Remove old sealant residue.
Bolt
- Replace after removing
- Loosening. Refer to Fig 2
- Tightening sequence. Refer to Fig 3
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 Pins
Alignment Pins
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 Loosening Sequence

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

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

Cylinder Head Cover Tightening Sequence

Fig 3: Cylinder Head Cover Tightening Sequence

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Replace the bolts after removing them.

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°.

NOTE:

Pay attention that the cylinder head cover is not tilted.