Contents: Removal ⬇ Installation ⬇
Removal
1. Lock 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 timing chain tensioner with rubber stop should be removed.
5. Unscrew the camshaft mounting screws and remove the camshaft chain drive sprockets.
6. Screw in the crankshaft screw with the sleeve and crankshaft pulley. Tightening torque: 90 Nm + turn an additional +45° (⅛ of a turn).
7. Unscrew the lock bolt "T10121" and turn the crankshaft 45° against the direction of rotation of the engine shaft. In this position, it is possible to carry out repair work on the valve timing mechanism.
Installation
Attention: Avoid installing any of the pistons at TDC.
Note.
- To turn the camshaft with the chain drive sprocket removed, screw the screw with 2 washers with a maximum torque of 50 Nm + 45° (⅛ of a turn) 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 counter support for loosening and tightening the camshaft screws.
- To make it easier to turn the crankshaft, unscrew the spark plugs.
1. Set the camshafts to TDC of the 1st cylinder and lock them from rotation.
2. Unscrew the camshaft screw.
3. Remove any remaining oil from the journals (pins) of the camshafts and the sprockets of the camshaft chain drive at the point of contact with a clean cloth.
4. Install the camshaft chain drive sprockets on the camshafts with the camshaft drive chain on, screw in new camshaft fastening screws in such a way that it is still possible to turn the camshaft chain drive sprockets a little.
5. Install the tensioner with rubber stop.
6. Tighten the camshaft drive chain.
7. Turn the crankshaft 45 degrees in the direction of engine rotation to TDC of the 1st cylinder, lock it from rotation.
Note.
- If the crankshaft passes the TDC mark of the first cylinder, you should turn the crankshaft back again and adjust the TDC of the first cylinder again.
- Otherwise, as a result of further rotation of the crankshaft, the piston will hit the valves.
8. Tighten the fastening screw (1) of the camshaft drive gears (2) with a tightening torque of 50 Nm (apply clamp 0172), as shown in the figure below.
9. Tighten the mounting screws by 90° (¼ turn).
Note: To perform the described work, the assistance of a second mechanic is required.
10. Crank the engine carefully at least two revolutions to ensure that the valves do not contact the piston crowns. Check the valve timing again.
11. Further installation is carried out in the reverse order of removal.