Overview - VALVETRAIN
WARNING: This page is about a different car, the 2023 Audi S3, 2023 Audi RS 3, 2023 Audi A3 Quattro, and 2023 Audi A3. However, it is still accessible from the selected car via links, so may be relevant.
- Exhaust Valve
- Do not rework, only grinding is permitted
- Valve Dimensions. Refer to VALVE DIMENSIONS .
- Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .
- Cylinder Head
- Only replace the cylinder head and cylinder head cover together
- Not Installed
- Valve Stem Seal
- There are different versions. Refer to Fig 5.
- Replacing. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING .
- Valve Spring
- Hydraulic Lifter
- Do not interchange
- Coat the contact surface with engine oil
- Upper Valve Spring Retainer
- Valve Keepers
- Clip
- For hydraulic lifter
- Roller Rocker Lever
- Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Mark the installed position for reinstallation.
- Allocation. Refer to Fig 4.
- Check the roller bearing for ease of movement
- Coat the contact surfaces with engine oil
- Exhaust Camshaft
- Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Check the radial clearance using Plastigage (roller rocker lever removed)
- Axial play: new 0.1 +0.102-0.05 mm
- Radial clearance: 0.024 to 0.066 mm
- Maximum run out: 0.04 mm
- After removing and installing or replacing an adaptation must be performed. Refer to PERFORM ADAPTATIONS AFTER COMPONENT REPLACEMENT .
- Cylinder Head Cover
- With integrated camshaft bearings
- Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Only clean the sealing surface, reworking is not permitted.
- Remove old sealant residue.
- Only replace the cylinder head and cylinder head cover together
- Bolt
- Replace after removing
- Tightening Specifications and Sequence. Refer to Fig 2.
- Ball Pin
- For the engine cover
- thread cutting
- In the existing threads: 9 Nm
- In the new tapping threads: 11 Nm
- Bracket
- For the wiring harness
- Bolt
- thread cutting
- In the existing threads: 9 Nm
- In the new tapping threads: 11 Nm
- Plugs
- O-Ring
- Replace after removing
- O-Ring
- No replacement part: included in the cam adjustment actuator delivery package
- coat with engine oil
- Cam Adjustment Actuator
- Cam Adjustment Actuator 1 -F366-
- Cam Adjustment Actuator 2 -F367-
- Cam Adjustment Actuator 3 -F368-
- Cam Adjustment Actuator 4 -F369-
- Cam Adjustment Actuator 5 -F370-
- Cam Adjustment Actuator 6 -F371-
- Cam Adjustment Actuator 7 -F372-
- Cam Adjustment Actuator 8 -F373-
- Removing and Installing. Refer to CAM ADJUSTMENT ACTUATOR, REMOVING AND INSTALLING .
- Bring into the installation position. Refer to Installing .
- Bolt
- 4.5 Nm
- Spring
- Ball
- for sliding bar
- Installing. Refer to SLIDING BAR BALL, INSTALLING .
- Intake Camshaft
- Removing and Installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Check the radial clearance using Plastigage (roller rocker lever removed)
- Axial play: new 0.1 +0.102-0.05 mm
- Radial clearance: 0.024 to 0.066 mm
- Run-out: maximum 0.04 mm
- After removing and installing or replacing an adaptation must be performed. Refer to PERFORM ADAPTATIONS AFTER COMPONENT REPLACEMENT .
- Alignment Pin
- Quantity: 2
- Intake Valve
- Do not rework, only grinding is permitted
- Valve Dimensions. Refer to VALVE DIMENSIONS .
- Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .
Cylinder Head Cover - Tightening Specifications and Sequence
- Replace bolts that were tightened with an additional turn after removing them.
- Pay attention that the cylinder head cover is not tilted.
-- Tighten the bolts -1 to 6- in steps in the sequence shown:
| Step | Tightening specification/additional turn |
|---|---|
| 1. | Install all the way in multiple steps by hand |
| 2. | 8 Nm |
| 3. | 90° additional turn |
Valve Spring, Installation Position and Allocation
- The tight spring coils -arrow- face toward cylinder head.
- Length of the valve spring, intake side, approximately 45.5 mm.
- Length of the valve spring, exhaust side, approximately 51.0 mm.
Roller Rocker Lever, Allocation
- Roller rocker lever, intake side, dimension -a- = 5.4 mm
- Roller rocker lever, exhaust side, dimension -b- = 8.0 mm
Valve stem seal allocation
A - Valve Stem Seal with a Sealing Lip -A-, Colored Green
- For the intake side
B - Valve Stem Seal with Two Sealing Lips -B-, Colored Red
- For the exhaust side