Timing chain covers, timing valves (Audi A4 B8)

Timing chain covers, timing valves

Upper timing chain cover - sequence, tightening

Tighten bolts "1...6" in the specified sequence.

Lower chain drive cover - tightening sequence

Tighten bolts "1...8" in 2 stages in the specified order.





1. Tighten the bolts to 4 Nm.

2. Tighten the bolts by 45°.

Removal and installation the upper timing chain cover

Disconnect connector "1" from valve 1 of the exhaust valve timing adjuster "N318" and connector "2" from valve 1 of the intake valve timing adjuster "N205". Unscrew the bolts "arrows" and remove valve 1 of the intake valve timing adjuster "N205" and valve 1 of the exhaust valve timing adjuster "N318".



Unscrew bolts "1...6" and remove the upper cover of the drive chain.

Installation

Installation in reverse order. Replace the seal. o-rings. Lubricate the lip seals and gaskets. rings with oil. Install the upper timing chain cover, sequence, tightening. Install the intake camshaft adjuster valve 1 "N205" and the exhaust camshaft adjuster valve 1 "N318".

Replacing the lower timing chain cover

Remove the front sound insulation. Remove the front bumper trim and bumper. Bring to service position. Before removing the poly V-belt, mark the direction of movement with chalk or a felt-tip pen for subsequent installation. To loosen the poly V-belt, turn the tensioner in the direction of the arrow. Secure the tensioner with the T10060 A locking pin. Remove the poly V-belt.



Unscrew the "arrow" bolts and remove the tensioner "1" of the poly V-belt from the additional holder. units.



Turn the vibration damper with counter-support "T10355" to the "TDC" position "arrow". The notch on the vibration damper must be opposite the arrow mark on the lower timing chain cover. Unscrew the damper bolt using the T10355 counter support. Remove the vibration damper. To avoid damaging the gear engagement, screw in the damper bolt only with the T10368 mandrel.





Reinstall the damper bolt and the T10368 drift. To avoid adjusting the timing, do not rotate the crankshaft past the TDC position with the damper bolt removed.



Unscrew bolt "1" and remove the dipstick guide tube from the drive chain cover.



Unscrew screws "1...8". Remove the lower cover of the drive chain.

Installation

Take into account the expiration date of the silicone sealant. The lid must be installed within 5 minutes after applying the silicone sealant. Replace bolts that were tightened with additional tightening. Replace all seals, gaskets and self-locking nuts. Remove any remaining sealant from the cylinder block using a flat scraper. Clean the sealing surfaces from oil and grease. Check that both dowel pins are present to center the "arrow" cover.



Cut off the tip of the tube along the front mark (hole diameter is about 3 mm). Apply sealant to the clean seating surface of the new cover as shown in the figure. Sealant bead thickness: 2-3 mm. The sealant bead should not be thicker than the specified width, otherwise excess sealant may enter the oil pan and clog the mesh filter in the oil intake pipe.





Install the cover immediately and tighten the bolts. After installing the cap, allow the sealant to dry for about 30 minutes. Only then can you add oil. Install the tensioner for the poly V-belt. Install the poly V-belt. Return to service position. Install the front bumper cover and bumper. Install the front noise insulation screen. Check the oil level.