Removing and Installing Chain Tensioner

WM 153619 Removing and installing chain tensioner





Information

Component overview





Installation location of chain tensioner

Removing chain tensioner

Removing chain tensioner

Caution:
Risk of damage to timing drive mechanism!
Never twist the crankshaft against the direction of rotation.
Remove and install the chain tensioner only in overlapping TDC. (The chain tensioner is under the least amount of pressure in this position).
Never twist the crankshaft when the chain tensioner is removed.

- Forces from the valve drive can cause the timing chain to jump over or tilt.

Ignition is off, ignition key is removed.

Information:
All spark plugs (except for those on cylinder 3) must be removed to ensure that the relevant dead center can be found more easily.
The torque support bracket can remain in place.

1. Remove spark plugs (except for cylinder 3)





Spark plug wrench

Information:
An alternative method for determining the overlapping TDC is the "cylinder pipe" (dead center finder). This tool is part of the pressure-loss tester WE 1066.

2. Find overlapping TDC of cylinder 1. To do this, insert the ignition rod module of the first cylinder into the corresponding opening in the valve cover and press in firmly.





Ignition rod module of cylinder 1

- Twist the crankshaft in the direction of motion until the ignition rod module comes out again with an audible plop. Then twist the crankshaft until the fixing bore on the crankshaft belt pulley is aligned with the bore in the timing case cover. The engine is now located in the ignition TDC of cylinder 1.





Ignition rod module of cylinder 1

- Then twist the crankshaft through 360° in the direction of motion. The engine is now located in the overlapping TDC of cylinder 1.





TDC of cylinder 1 for vibration damper fastening

3. Open cable clip -7- of the generator's electric cable and press the cable upwards.





Cable clip

4. Undo chain tensioner -arrow- and unscrew it by hand.





Installation position of chain tensioner

Installing chain tensioner

Installing chain tensioner

Information:
If the chain tensioner is removed, the aluminum sealing ring must be replaced.

1. Screw chain tensioner with new sealing ring -arrow- down by hand and tighten. - Tightening torque: 44 ftlb.





Installation position of chain tensioner

2. Clip in the electric cable of the generator again.





Cable clips

3. To check, turn crankshaft two turns in a clockwise direction. Watch out for any stiffness.
4. Install spark plugs and covers.





Installing spark plugs