Camshaft chain drives (Audi Q5-8R)

Removal chains from camshafts

The following description assumes that the camshaft drive chains remain on the engine. Remove the appropriate cylinder head cover. Remove the camshaft chain guards on the left and reference. Remove noise insulation screens "1" and "2".



Cars without coolant recovery pump "V51": Unscrew bolt "1" and nut "3", remove left brace "2" of radiator frame. Install device for pumping and collecting oil under engine. Unscrew bolts "arrows" and secure engine oil radiator with connected coolant hoses "1" and "2" to the side.



Cars with a coolant recovery pump "V51": Remove the coolant recovery pump "V51" and the oil radiator.

All

Insert the guide pins of the adapter "T40058" as shown below: the large diameter "arrow 1" faces the engine. The small diameter "arrow 2" faces the adapter.





Turn the cardan shaft using the adapter "T40058" in the direction of engine rotation "arrow" to "TDC".



Unscrew the threaded plug "arrow" for the "TDC" mark from the cylinder block.



When the engine is installed, the crankshaft fixing hole is barely visible. Therefore, turn the engine so that the small notch "1" on the torsional vibration damper to the left of the direction of travel on the left is located opposite the butt weld on the housing "2" between the cylinder block and the camshaft frame.





This makes it easier to screw in the T40069 locking bolt. The mark on the torsional vibration damper is only an auxiliary means. The exact position of the TDC mark can only be achieved by turning the T40069 locking screw. The threaded holes of the arrows in the camshafts must be directed upwards.



Screw the "T40069" fixing bolt into the hole with a torque of 20 Nm; if necessary, turn the crankshaft slightly in both directions to completely center the bolt.



Retainers of camshafts "T40133" should be installed on both cylinder heads and tightened with a torque of 25 N·m "arrows".





The left cylinder head is shown in the figure. Move the sliding bar of the left camshaft chain tensioner with screwdriver "1" inward until it stops and secure the tensioner with the lock "T40071". The chain tensioner is equipped with an oil damper, so press on it gradually with uniform force.



Move the sliding bar of the right camshaft chain tensioner with screwdriver 1 - turn it inward until it stops and secure the tensioner with the "T40071" lock.



The chain tensioner is equipped with an oil damper, so press it gradually with uniform force. Move the sliding bar of the right camshaft chain tensioner with screwdriver "1" turn inward until it stops and secure the tensioner with the lock "T40071".





The chain tensioner is equipped with an oil damper, so apply pressure gradually and evenly. Risk of damaging the camshaft. Never use the camshaft locking tool "T40133" as a counter support to loosen bolts "1" of the camshaft phase shifter. Mark the installation position of the phase shifter for reinstallation. Risk of damaging the engine. Cover the opening with a clean rag to prevent small parts from getting into the engine through the hole in the drive chain casing. Loosen bolts "1" and "2" on the left cylinder head and remove both phase shifters.



Mark the mounting position of the phase shifter for reinstallation. Unscrew bolts "1" and "2" on the cylinder head on the right and remove both phase shifters.

Installation

Replace bolts that were tightened with additional turning. Replace the sealing ring of the "TDC" threaded plug. Risk of damage to the valves and piston crowns. When turning the camshaft, not one piston of the crankshaft should be at "TDC". The drive chain of the chain drive is installed. The crankshaft is fixed with the fixing bolt "T40069" in the "TDC" position. The camshaft locks "T40133" are installed on both cylinder heads and tightened with a torque of 25 N·m "arrows". The left cylinder head is shown in the figure. Risk of engine damage. During the following repair work, the phase shifters may only be mounted in such a way that the grooves "1" and "4" are installed opposite the installation windows (polished surfaces) "2" and "3".



Install the camshaft phase shifters on the left cylinder head according to the markings applied during removal. Install the left drive chain on the drive sprocket and on the phase shifter and tighten bolts "1" and "2". Both phase shifters should be able to turn on the camshaft, they should not be skewed. Remove the locking pin "T40071".





Install the camshaft phase shifters on the right cylinder head according to the markings made during removal. Install the right drive chain on the drive sprocket and on the phase shifter and tighten bolts "1" and "2". Both phase shifters must be able to turn on the camshaft, they must not be skewed. Remove locking pin "T40071". Place counter support "T10172" with pin "T10172/2" on the phase shifter of the left inlet camshaft. The second mechanic must maintain the pre-tension of the camshaft drive chain by pressing the counter support in the direction of the "arrow". Tighten the bolts as follows, while the phase shifter still remains pre-tensioned:

• 1. Pre-tighten the bolt to the intake camshaft to 80
• 2. Pre-tighten bolt "1" to the exhaust camshaft to a torque of 80 Nm.

Install the support "T10172" with the pin "T10172/2" on the phase shifter of the right exhaust camshaft. The second mechanic must maintain the pre-tension of the camshaft drive chain by pressing the counter support in the direction of the "arrow". Tighten the bolts as follows, while the phase shifter still remains pre-tensioned:

• 1. Pre-tighten the bolt to the exhaust camshaft to 80 Nm.
• 2. Pre-tighten bolt "1" to the intake camshaft to a torque of 80 Nm.

Remove the camshaft locks "T40133" from both cylinder heads "arrows". The left cylinder head is shown in the figure. Tighten the phase shifter bolts on the left cylinder head as follows:

• 1. Tighten bolt "1" to the intake camshaft to the final torque.
• 2. Tighten bolt "2" to the exhaust camshaft to the final torque.

Tighten the phase shifter bolts on the right cylinder head as follows:

• 1. Tighten bolt "1" to the intake camshaft to the final torque.
• 2. Tighten bolt "2" to the exhaust camshaft to the final torque.

Loosen the locking bolt "T40069". Turn the crankshaft using the adapter "T40058" by 2 turns in the direction of engine rotation "arrow" so that the crankshaft returns to the "TDC" position. If the crankshaft has risen above "TDC", it should be turned back by 30° and moved to "TDC" again. The threaded holes "arrows" in the camshafts must point upwards. Install the camshaft locks "T40133" on both cylinder heads and tighten to a torque of 25 N·m "arrows". Screw the locking bolt "T40069" directly into the hole. The locking bolt "T40069" must enter the hole on the crankshaft "1", otherwise repeat the adjustment. Remove the camshaft locks from both cylinder heads. Loosen the locking bolt "T40069". Installation in reverse order: Install the threaded plug for the "OT" marking. Install the timing chain guards on the left and right. Install the cylinder head covers on the left and right. Install the engine oil cooler. Install the "V51" coolant after-treatment pump. Install the radiator frame spacer. Install the sound insulation.