Left camshaft timing chain 1/2. Bolt. Replace. 80 Nm + additional rotation by 90°; 3. Exhaust camshaft phase shifter. Marking "Exhaust"; 4. Intake camshaft phase shifter. Marking "Intake"; 5. Left camshaft drive chain. Remove the chain from the camshafts. Before removing, mark the direction of travel with paint; 6. Bolt. 9 Nm; 7. Slider; 8. Left camshaft chain tensioner; 9. Chain drive sprocket bracket; 10. Bolt. Replace. 8 Nm+ additional rotation by 45°; 11. Drive sprocket for the camshaft drive chain on the left; 12. Washer for axial fixation of the chain drive drive sprocket; 13. Bolt. Replace. 6 Nm + additional rotation by 60°
Right camshaft timing chain 1/3. Bolt. Replace. 80 Nm + additional rotation by 90°; 2. Exhaust camshaft phase shifter; 4. Intake camshaft phase shifter. Marking "Intake"; 5. Bolt. Replace. 30 Nm + additional rotation by 90°; 6. Drive sprocket support pins for the camshaft drive chain on the right. Asymmetrical design; 7. Drive sprocket for the camshaft drive chain on the right; 8. Camshaft drive chain on the right. Remove the chain from the camshafts. Before removing, mark the direction of travel with paint; 9. Washer for axial fixation of the chain drive drive sprocket for the camshaft drive chain on the right. Asymmetrical design; 10. Tensioner for the camshaft drive chain on the right; 11. Slider; 12. Bolt. 9 Nm
Removing chains from camshafts
The following description assumes that the camshaft drive chains remain on the engine. Remove the relevant cylinder head cover. Remove the left camshaft chain guards and help. Remove noise insulation panels -1- and -2-.
Vehicles without run-on coolant pump -V51 -: Remove bolt -1- and nut -3-, remove left radiator frame brace -2-. Install a device for pumping and collecting oil under the engine. Remove bolts -arrows- and secure engine oil cooler with connected coolant hoses -1- and -2- to one side.
Vehicles with run-on coolant pump -V51-: Remove run-on coolant pump -V51- and oil cooler.
All
Insert guide pins of adapter -T40058- as shown below: large diameter -arrow 1 - faces engine. The small diameter -arrow 2- faces the adapter.
Use adapter -T40058- to turn propeller shaft in direction of engine rotation -arrow- on "TDC".
Unscrew the screw plug -arrow- for the mark "TDC" from the cylinder block.
With the engine installed, the crankshaft locking hole is barely visible. Therefore, turn the engine until the small notch -1- on the vibration damper to the left of the direction of travel on the left is located opposite the butt seam on the housing -2- between the cylinder block and the camshaft frame.
This makes it easier to screw in the retaining bolt -T40069-. The mark on the vibration damper is only an aid. Exact position of the mark "TDC" can only be achieved by turning the locking screw -T40069-. The threaded holes -arrows- in the camshafts must point upwards.
Screw the fixing bolt -T40069 with a torque of 20 Nm into the hole; if necessary, to completely center the bolt, turn the crankshaft slightly in both directions.
Install the camshaft clamps -T40133- on both cylinder heads and tighten to a torque of 25 Nm -arrows-.
The picture shows the left cylinder head. Use a screwdriver -1- to move the sliding bar of the left camshaft chain tensioner inwards as far as it will go and secure the tensioner with the clamp -T40071-. The chain tensioner is equipped with an oil damper, so apply pressure gradually and evenly.
Move the sliding bar of the right camshaft chain tensioner using a screwdriver '1 - turn it inward as far as it will go and secure the tensioner with the clamp -T40071-.
The chain tensioner is equipped with an oil damper, so apply pressure gradually and evenly. Move the sliding bar of the right camshaft chain tensioner using a screwdriver -1-, turn it inward as far as it will go and secure the tensioner with the clamp -T40071-.
The chain tensioner is equipped with an oil damper, so apply pressure gradually and evenly. Risk of damage to the camshaft. To loosen the camshaft phase shifter bolts -1-, do not use the camshaft clamp -T40133- as a counter support under any circumstances. Mark the mounting position of the phase shifter for reinstallation. Risk of engine damage. To prevent small parts from falling into the engine through the hole in the drive chain housing, cover the hole with a clean rag. Remove bolts -1- and -2- on the left cylinder head and remove both phase shifters.
Mark the mounting position of the phase shifter for reinstallation. Remove bolts -1- and -2- on the right cylinder head and remove both phase shifters.
Installation
Replace bolts that were overtightened. Replace seal. screw plug ring "TDC". Risk of damage to valves and piston crowns. When turning the camshaft, not one piston of the crankshaft should be in "TDC". The chain drive drive chain is installed. The crankshaft is secured in position using the locking bolt -T40069- "TDC". The camshaft clamps -T40133- are installed on both cylinder heads and tightened to a torque of 25 Nm -arrows-. The picture shows the left cylinder head. Risk of engine damage. During the following repair work, 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 be rotated on the camshaft; they should not be skewed. Remove locking pin -T40071-.
Install the camshaft phase shifters on the right cylinder head according to the markings applied during removal. Install the right drive chain onto the drive sprocket and phase shifter and tighten bolts -1- and -2-. Both phase shifters should be able to be rotated on the camshaft; they should not be skewed. Remove locking pin -T40071-. Attach counter support -T10172- with pin -T10172/2- to phase shifter for left intake camshaft. The second mechanic should press the counter support in the direction -arrow- to maintain the pre-tension of the camshaft drive chain. Tighten the bolts as follows, with the phase shifter still pre-tensioned:
- 1. Pre-tighten the bolt to the intake camshaft to a torque of 80
- 2. Pre-tighten the bolt -1- to the exhaust camshaft to a torque of 80 Nm.
Install support -T10172- with pin -T10172/2- onto the right exhaust camshaft phase shifter. The second mechanic should press the counter support in the direction -arrow- to maintain the pre-tension of the camshaft drive chain. Tighten the bolts as follows, with the phase shifter still pre-tensioned:
- 1. Pre-tighten the bolt to the exhaust camshaft to a torque of 80 Nm.
- 2. Pre-tighten the bolt -1- to the intake camshaft to a torque of 80 Nm.
Remove camshaft retainers -T40133- from both cylinder heads -arrows-. The picture shows the left cylinder head. Tighten the phase shifter bolts on the left cylinder head as follows:
- 1. Tighten bolt -1 - to the intake camshaft to final torque.
- 2. Tighten the bolt -2- to the exhaust camshaft to final torque.
Tighten the phase shifter bolts on the right cylinder head as follows:
- 1. Tighten bolt -1 - to the intake camshaft to final torque.
- 2. Tighten the bolt -2- to the exhaust camshaft to final torque.
Release securing bolt -T40069-. Using adapter -T40058-, turn crankshaft 2 turns in direction of engine rotation -arrow- until crankshaft returns to position "TDC. If the crankshaft rises higher "TDC", then it should be turned back 30°and moved again to "TDC". The threaded holes -arrows- in the camshafts must point upwards. Install the camshaft clamps -T40133 on both cylinder heads and tighten to a torque of 25 Nm -arrows-. Screw the fixing bolt -T40069- directly into the hole. The fixing bolt -T40069- must fit into the hole on the crankshaft -1-, otherwise repeat the adjustment. Remove the camshaft retainers from both cylinder heads. Release securing bolt -T40069-. Installation in reverse order: install marking screw "FROM". 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 coolant bleeder pump after the engine is switched off -V51-. Install the radiator frame strut. Install sound insulation.
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