Part I
WARNING: This page is about a different car, the 2018 Audi Q3 Quattro, 2018 Audi Q3, 2017 Audi Q3 Quattro, and 2017 Audi Q3. However, it is still accessible from the selected car via links, so may be relevant.
For Valvetrain, Engine With Two Camshaft Adjusters - Part II. Refer to Part II .
- 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
- There are different versions. Refer to Fig 4.
- Replacing. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING .
- Valve Spring
- Valve Spring Retainer
- Valve Retainers
- Hydraulic Lifter
- Do not interchange
- Lubricate the contact surface
- Clip
- For hydraulic lifter
- Roller Rocker Lever
- Mark the installed position for reinstallation.
- Check the roller bearing for ease of movement
- Lubricate the running surfaces before installing
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Exhaust Camshaft
- Radial clearance: 0.024 to 0.066 mm
- Run-out: maximum 0.04 mm
- Check the radial clearance using Plastigage® (roller rocker lever removed)
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Spring
- No replacement part
- Ball
- For sliding bar
- Installing. Refer to SLIDING BAR BALL, INSTALLING .
- Cylinder Head Cover
- With integrated camshaft bearings
- Clean the sealing surface, reworking is not permitted.
- Remove old sealant residue.
- Removing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Bolt
- Intake Camshaft
- Radial clearance: 0.024 to 0.066 mm
- Run-out: maximum 0.04 mm
- Check the radial clearance using Plastigage® (roller rocker lever removed)
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- 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 .
-- Loosen the cylinder head cover in the sequence -1 through 6-.
- Replace the bolts that were tightened with an additional turn after removing them.
- Pay attention that the cylinder head cover is not tilted.
-- Tighten the bolts in the steps shown in the sequence:
| Step | Bolts | Tightening specification/additional turn |
|---|---|---|
| 1. | -1 to 6- | Install all the way in multiple steps by hand |
| 2. | -1 to 6- | 8 Nm |
| 3. | -1 to 6- | 90° additional turn |
A - Valve stem seal with a sealing lip -A-
- For intake and exhaust side
B - Valve stem seal with two sealing lips -B-
- Only for exhaust side, specific engines. Refer to the parts information for the allocation.