Audi S4 2.7L B5 . Exploded Views Timing Chain Tensioner

Vehicle: Exploded Views Timing Chain Tensioner Valve Gear, Servicing Note: - Cylinder heads which have cracks between the valve seats or between valve seat inserts and the spark plug thread can be used further without reducing service life, the cracks do not exceed a maximum of 0.3 mm in width, or when no more than the first 4 turns of the spark plug threads are cracked. - After installing new lifters the engine must not be started for about 30 minutes (otherwise valves will strike pistons). Turn crankshaft two complete revolutions before starting. - Carefully apply a small amount of sealant D 454 300 A2 at the four end points of the sealing surfaces on the cylinder head, using a small screwdriver, Refer to Fig. 1. 1. Double bearing cap - Lightly coat with sealant 454 300 A2 before installing. 2. Exhaust camshaft bearing cap - With connection for oil feed pipe - Watch position of dowel sleeve - Note installation position and numbering - Lightly coat last bearing cap (after the chain) with sealant D 454 300 A2 before installing 3. 10 Nm

4. Exhaust camshaft - Checking axial clearance, See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and Push Rods/Camshaft/Testing and Inspection/Camshaft Axial Clearance, Checking - Removing and installing, See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and Push Rods/Camshaft/Service and Repair - Check radial clearance with Plastigage (lifters removed) Wear limit: 0.1 mm Run-out: 0.01 mm (maximum) 5. Cap - Always replace 6. Inlet camshaft bearing cap - With connection for oil feed pipe - Note installation position and numbering See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and Push Rods/Camshaft/Service and Repair 7. Inlet camshaft - Checking axial clearance, See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and Push Rods/Camshaft/Testing and Inspection/Camshaft Axial Clearance, Checking - Removing and installing, See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and Push Rods/Camshaft/Service and Repair - Check radial clearance with Plastigage (lifters removed) Wear limit: 0.1 mm Run-out: 0.01 mm (maximum) 8. Drive chain - Installing, See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and Push Rods/Camshaft/Service and Repair 9. 10 Nm 10. Mechanical - camshaft adjuster - With camshaft adjustment valve -N205 - Secure with special tool 3366 before removing, See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and Push Rods/Camshaft/Service and Repair 11. Hydraulic bucket lifter - Removing and installing with cylinder head installed, See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and Push Rods/Camshaft/Service and Repair 12. Valve cotters 13. Valve spring plate 14. Valve spring 15. Valve stem seal - Replacing with cylinder head installed, See: Engine, Cooling and Exhaust/Engine/Seals and Gaskets/Valve Guide Seal/Service and Repair 16. Rubber/metal - gasket - Always replace 17. Seal - Always replace 18. Cylinder head - Checking for distortion - Reworking, See: Engine, Cooling and Exhaust/Engine/Cylinder Head Assembly/Service and Repair 19. Exhaust valve 20. Inlet valve 21. Oil seal (Hall sender end) - Always replace, See: Engine, Cooling and Exhaust/Engine/Seals and Gaskets/Camshaft Oil Seal/Service and Repair 22. Rotor for Hall sender - Note position (notch on camshaft) 23. Washer - Conical 24. 25 Nm 25. Hall sender 26. 10 Nm 27. 30 Nm +180 (1/2 turn) 28. Camshaft sprocket 29. Oil seal (toothed belt end) - Replacing, See: Engine, Cooling and Exhaust/Engine/Seals and Gaskets/Camshaft Oil Seal/Service and Repair

Fig. 1 Sealing end points of joints between bearing caps and cylinder head - Carefully apply small quantity of sealant D 454 300 A2 at four end points of sealing surfaces on cylinder head -arrows-, using a small screwdriver.