Removing
1. Block the camshafts and crankshaft at TDC of the 1st cylinder.
2. Remove the timing chain housing.
3. Lock the camshaft drive chain tensioner.
4. The camshaft drive chain tensioner with rubber stop must be removed.
5. Unscrew the screws securing the camshafts, remove the camshaft chain sprockets.
6. Screw in the crankshaft screw with bushing and crankshaft pulley. Tightening torque: 90 Nm + turn an additional +45° (⅛ turnover).
7. Unscrew locking bolt -T10121- and turn crankshaft 45°against direction of engine rotation. In this position, it is possible to carry out repair work on the gas distribution valve mechanism.
Installation
Attention. Avoid installing any of the pistons at TDC.
Note.
- In order to turn the camshaft with the chain sprocket removed, the screw with 2 washers must be screwed in with a maximum of 50 Nm + 45° (⅛ turnover) into the camshaft and turn the camshaft. In this case, the pistons must not be in the TDC position.
- The locking device -T10123- must not be used as a counterholder for loosening and tightening the camshaft screws.
- To facilitate turning the crankshaft, unscrew the spark plugs.
1. Install the camshafts at TDC of the 1st cylinder, block them from rotation.
2. Unscrew the camshaft screw.
3. Use a clean rag to remove the remaining oil from the necks (pins) camshafts and camshaft chain sprockets at the point of contact.
4. Install the camshaft chain sprockets with the camshaft drive chain on the camshafts, screw in new screws securing the camshafts so that you can still turn the camshaft chain sprockets a little.
5. Install tensioner with rubber stop.
6. Tighten the camshaft drive chain.
7. Turn the crankshaft 45 in the direction of engine rotation to the TDC of the 1st cylinder, block it from rotation.
Note.
- If the crankshaft passes the TDC mark of the first cylinder, turn the crankshaft back again and adjust the TDC of the 1st cylinder again.
- Otherwise, as a result of further rotation of the crankshaft, the piston will hit the valves.
8. Tighten the fastening screw (1) camshaft drive gears (2) with tightening torque 50 Nm (apply pressing tool 0172), as shown in the figure below.
9. Tighten the fastening screws by 90° (¼ turn).
Note. The assistance of a second mechanic is required to carry out the described work.
10. Crank the engine at least two turns carefully to make sure. that the valves are not in contact with the piston crowns. Again check the timing of the valve timing.
11. Next, the installation is carried out in the reverse order of removal.