Timing chain lower cover, removing and installing
WARNING: This page is about a different car, the 2010 Audi A8, 2009 Audi A8, 2008 Audi A8, and 2007 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.
Special tools, testers and auxiliary items required
- Old oil collecting and extracting device V.A.G 1782
- Hand drill with plastic brush attachment
- Protective glasses
- Sealant
Removing
- Remove rear sound insulation by loosening fasteners - 1 and 2 -.
NOTE:
- Ignore items - 3 and 4 -.
- Place old oil collecting and extracting device V.A.G 1782 under engine and drain engine oil.
- Remove automatic transmission → 37 - CONTROLS, HOUSING .
- Remove drive plate → Drive plate, removing and installing .
- Remove left and right timing chain covers → Left and right timing chain covers, removing and installing .
- Remove intake manifold → 24 - MULTIPORT FUEL INJECTION (MFI) .
- Remove oil filter housing → Oil filter housing, removing and installing .
- Remove bolts - arrows -.
- Remove bolts - 1 through 13 - and remove lower timing chain cover.
- Press transmission-side crankshaft sealing ring out of lower timing chain cover.
Installing
- Tightening torques → Timing chain lower cover tightening sequence
Installation is in reverse order of removal, note the following:
- Pull alignment bushing out of top right of cylinder block.
- Chamfer alignment bushing with a file, as shown in the illustration.
- Dimension - x - = 6.5 mm.
- Dimension - y - = 8 mm.
- Install alignment bushing into cylinder block so that chamfered side faces upward.
NOTE:
- Because of the chamfer, the lower timing chain cover can be positioned more easily when the cylinder head is installed.
CAUTION:
Risk of eye injury.
- Wear safety glasses.
CAUTION:
Risk of contaminating lubricating system.
- Cover open parts of engine.
- Remove sealant residue on lower timing chain cover and on cylinder block and cylinder head, e.g. with a rotating plastic brush.
- Clean sealing surfaces so they are completely free of any oil or grease.
- Clean old sealant from holes - arrow - in the cylinder head gaskets.
NOTE:
- With the cylinder head installed only half of the holes in the cylinder head gasket are visible.
CAUTION:
Risk of damaging cylinder head seal.
- Only bend ends of cylinder head seals slightly, do not kink.
NOTE:
- A kinked cylinder head gasket must be replaced.
- Bend the ends of cylinder head gaskets very slightly downward - arrows - until upper sealing surface of gasket and cylinder head can be cleaned.
- Clean both cylinder head gaskets, top and bottom, so they are completely free of any oil or grease.
- Cut off nozzle on tube of sealant at front mark (dia. of nozzle approx. 2 mm).
CAUTION:
Risk of damaging cylinder head seal.
- Only bend ends of cylinder head seals slightly, do not kink.
NOTE:
- A kinked cylinder head gasket must be replaced.
- Coat sealing surfaces of the cylinder head gaskets, top and bottom, to do this with a thin layer of sealant, slightly bending cylinder head gaskets downward again - arrows -.
- To coat surface between cylinder head and gasket, use a flat object, e.g. a feeler gauge.
- Apply sealant beads - 1 to 9 - on clean sealing surfaces of lower timing chain cover, as shown in illustration.
- Thickness of sealant beads: 2.5 mm.
NOTE:
- Lower timing chain cover must be installed within 5 minutes of applying sealant.
- Set lower timing chain cover in place, guiding cover at an angle from below onto sealing surface of the cylinder block and cylinder head.
- When installing, make sure that the cylinder head gaskets do not become damaged.
NOTE:
- A damaged cylinder head seal must be replaced.
- Tighten bolts → Timing chain lower cover tightening sequence .
The rest of installation is in reverse order of removal, note the following:
- Install crankshaft seal, transmission side → Transmission-side crankshaft sealing ring, replacing .
- Install oil filter housing → Oil filter housing, removing and installing .
- Install intake manifold → 24 - MULTIPORT FUEL INJECTION (MFI) .
- Install left and right timing chain covers → Installing .
- Install drive plate → Drive plate, removing and installing .
- Install automatic transmission → 37 - CONTROLS, HOUSING .
- Add engine oil and check oil level → Oil level, checking .