A8 Sedan V8-3.7L (AEW) (1997)
Valve Guide Seal: Service and Repair
NOTE: During removal and installation procedures, refer to the component location illustration above and component notes below.
Component Notes And Information
1
Nut, tighten to: 15 Nm (11 ft lb)
2
Bearing Cap
3
Drive Chain
4
Nut, tighten to: 15 Nm (11 ft lb)
-
For bearing cap in front of chain
5
Intake Camshaft
-
Checking axial play. See: Camshaft, Lifters and Push Rods/Camshaft/Testing and Inspection
-
Check radial clearance with Plastigage:
Wear limit: 0.1 mm (0.004 inch)
-
Run out: 0.01 mm (0.0004 inch)
6
Nut, tighten to: 15 Nm (11 ft lb)
7
Exhaust Camshaft
-
Checking: same as intake camshaft
8
Hydraulic Valve Lifter
-
Checking, refer to Testing and Inspection. See: Camshaft, Lifters and Push Rods/Lifter / Lash Adjuster/Testing and Inspection
-
Oil contact surfaces before installing
-
Store with camshaft contact surface face down
9
Valve Guide
-
Checking for wear, refer to Testing and Inpection. See: Cylinder Head Assembly/Valve Guide/Testing and Inspection
10
Bolt, tighten to: 10 Nm (89 inch lb)
11
Intermediate Flange
-
For Camshft Position Sensor (CMP)
12
Cylinder Head
-
Refacing valve seats, refer to Refacing. See: Cylinder Head Assembly/Valve Seat/Service and Repair
13
Valves
-
Sodium-filled exhaust valves must be disposed of properly, refer to Service Precautions. See: Cylinder Head Assembly/Valve
Removal
NOTE: With cylinder head installed.
1. Remove camshaft and valve lifters.