Valve gear, servicing: Notes
WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, and 2003 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Cylinder heads which have cracks between valve seats or between valve seat inserts and the spark plug thread can be used further without reducing service life, provided cracks do not exceed a max. of 0.3 mm in width, or when no more than first 4 turns of spark plug threads are cracked.
- After installing camshafts, engine must not be started for approx. 30 minutes. Hydraulic valve compensation elements have to settle (otherwise valves will strike pistons).
- After working on valve gear, turn engine carefully at least 2 rotations to ensure that none of the valves make contact when starter is operated.
- Always replace gaskets and sealing rings.
1 - 65 Nm
- Use counterhold 3036 to loosen and tighten
2 - Camshaft sprocket
- For exhaust camshaft
- Note installed position: Narrow web of camshaft sprocket must face toward front and marking for TDC No. 1 cylinder must be visible from front Install camshaft sprocket. under Installing
3 - Oil seal
- For exhaust camshaft
- Replacing → Exhaust camshaft oil seal, replacing
4 - Cylinder head
- See note → Valve gear, servicing
- Checking valve guides → Valve guides, checking
- Refacing valve seats → Valve seats, refacing
- Dowel sleeves for bearing caps must be located in cylinder head
- Sealing transition points Sealing transition points between double bearing cap and cylinder head (2 points): and Sealing camshaft adjuster/cylinder head transition (4 points)
5 - Valve guide
- Checking → Valve guides, checking
6 - Valve stem seal
- Replacing → Valve stem seals, replacing
7 - Valve spring
- Removing and installing → Valve stem seals, replacing
8 - Valve spring plate
9 - Valve keeper
10 - Hydraulic valve lifter
- Checking → Hydraulic valve lifters, checking
- Removing and installing → Valve stem seals, replacing
- Do not interchange
- Store with contact surface downward
- Before installing check camshaft axial clearance → Camshaft axial clearance, checking
- Oil contact surface
11 - Intake camshaft
- Check radial clearance with Plastigage™ (valve lifters not installed), Wear limit: 0.1 mm; Run-out: max. 0.035 mm
- Checking axial clearance → Camshaft axial clearance, checking :
- Removing and installing camshafts → Camshafts and camshaft adjuster, removing and installing
12 - Bearing cap for intake camshaft
- Must be located on dowel sleeves
- Dowel sleeves must be located in cylinder head
- Note installed position
- Installation sequence
13 - Double bearing cap
- Must be located on dowel sleeves
- Dowel sleeves must be located in cylinder head
- Apply small amount of AMV 188 001 02 to sealing surface before installation
- Sealing transition points between double bearing cap and cylinder head Sealing transition points between double bearing cap and cylinder head (2 points):
14 - Exhaust camshaft
- Check radial clearance with Plastigage™ (valve lifters not installed): Wear limit: 0.1 mm; Run-out: max. 0.035 mm
- Checking axial clearance → Camshaft axial clearance, checking
- Removing and installing camshafts → Camshafts and camshaft adjuster, removing and installing
15 - Bearing cap for exhaust camshaft
- Must be located on dowel sleeves
- Dowel sleeves must be located in cylinder head
- Note installed position
- Installation sequence
16 - 10 Nm
17 - 10 Nm
18 - Drive chain
- Check for wear
- Mark position of chain before removing Clean chain and camshaft sprockets opposite two under Removing
- Removing and installing → Camshafts and camshaft adjuster, removing and installing , Camshaft, removing and installing
19 - Camshaft adjuster
- With Valve 1 for camshaft adjustment N205
- Checking → Camshaft timing control, checking
- Secure with retainer for chain tensioner 3366 before removing
- Removing and installing → Camshafts and camshaft adjuster, removing and installing
- Sealing transition points between camshaft adjuster and cylinder head Sealing camshaft adjuster/cylinder head transition (4 points)
20 - Rubber/metal gasket
- Apply sealant AMV 188 001 022 before installation
21 - Gasket
- Replace
22 - Exhaust valve
- With sodium filling
- Note instructions on scrapping valves with sodium filling Valve dimensions
- Do not rework, only lapping is permitted
- Valve dimensions Valve dimensions
- Checking valve guides → Valve guides, checking
- Refacing valve seats → Valve seats, refacing
23 - Intake valve
- Do not rework, only lapping is permitted
- Valve dimensions Valve dimensions
- Checking valve guides → Valve guides, checking
- Refacing valve seats → Valve seats, refacing
24 - Oil seal
- For intake camshaft
- Replacing → Intake camshaft oil seal, replacing
25 - Camshaft position sensor rotor ring
- Note installed position: locate lug in notch on camshaft
26 - Washer
- Conical
- Note installed position
27 - 25 Nm
28 - Housing for Camshaft Position (CMP) sensor G40
29 - 10 Nm