A8L Quattro Sedan W12-6.0L (BSB) (2005)
‹› 2 pieces
‹› Clean
5
Valve stem seal
‹› Replacing => [ Valve Stem Seals ] See: Seals and Gaskets/Valve Guide Seal/Service and Repair.
6
Valve spring
‹› Installation position: Larger diameter faces toward cylinder head
7
Valve spring plate
8
Valve keys
9
Piston rings for camshaft adjuster
‹› Install with gaps offset by 120°
‹› Oil contact surfaces
‹› When installing, only spread piston rings minimally
10
5 Nm plus an additional 45° (1/8 turn)
‹› Observe tightening sequence: Right cylinder head => [ Cylinder bank 1 (right) ] See: Camshafts, left cylinder head => [ Cylinder bank 2 (left) ]
See: Camshafts
11
Bearing cap
‹› Mark bearing caps 6 and 9
‹› Observe installed position and tightening sequence: Right cylinder head => [ Cylinder bank 1 (right) ] See: Camshafts, left cylinder head => [
Cylinder bank 2 (left) ] See: Camshafts
‹› On bearing caps for axial bearing, lightly coat face surface with adhesive lubricating paste before installing => [ Coat face surface of bearing
cap for axial
bearing with adhesive lubricating paste ]
12
Intake camshaft
‹› Checking axial play => [ Camshafts, Checking Axial Clearance ] See: Testing and Inspection
‹› Check radial clearance using Plastigage (roller rocker lever removed)
‹› Radial clearance wear limit: 0.1 mm
‹› Run-out: Max. 0.01 mm
‹› Removing and installing => [ Camshaft Adjuster ] See: Variable Valve Timing Actuator/Service and Repair
‹› Identification => [ Camshaft identification cylinder bank 1 (right) ] and => [ Camshaft identification cylinder bank 2 (left) ]
13
Exhaust camshaft
‹› Checking axial play => [ Camshafts, Checking Axial Clearance ] See: Testing and Inspection
‹› Check radial clearance using Plastigage (roller rocker lever removed)
‹› Radial clearance wear limit: 0.1 mm
‹› Run-out: max. 0.01 mm
‹› Removing and installing => [ Camshaft Adjuster ] See: Variable Valve Timing Actuator/Service and Repair