Removal
1. On engines 111: secure the tensioner rocker arm 2 and tension pulley 3 from moving in the direction of rotation (see figure 1.8).
Figure 1.8. Loosening of the drive belt on engines 111.979.
2. Remove the generator drive belt.
Examination
3. Check the condition of the pulleys and belt tensioner for damage and contamination. Replace damaged elements if necessary.
Installation
4. Install the drive belt on the pulleys, starting with the tensioner pulley (see figure 1.9 a, b, 1.10a, b, 1.11).
Figure 1.9a. Generator drive belt installation diagram on engine 111 (without air conditioning).
Figure 1.9b. Generator drive belt installation diagram on engine 111 (with air conditioning).
1. Tension pulley,
2. Crankshaft pulley,
3. Air conditioning compressor,
4. Generator,
5. Power steering pump,
6. Water pump.
Figure 1.10a. Generator drive belt installation diagram on engine 611.980 (without air conditioning).
1. Tension pulley,
2. Crankshaft pulley,
4. Generator,
5. Power steering pump,
6. Water pump,
7. Guide pulley.
Figure 1.10b. Generator drive belt installation diagram on engine 611.980 (with air conditioning).
1. Tension pulley,
2. Crankshaft pulley,
3. Air conditioning compressor,
4. Generator,
5. Power steering pump,
6. Water pump.
Figure 1.11. Generator drive belt installation diagram on engine 104.900:
1. Crankshaft pulley,
2. Power steering pump, 3. Air conditioning compressor, 4. Generator, 5. Tensioner pulley, 6. Water pump.
5. Tighten the drive belt.
On engines 111.979:
- secure the tensioner swing arm 2 and tension pulley 3 from moving in the direction of rotation (see figure 1.8). Install the belt onto the water pump pulley;
- release the rocker arm and tension pulley. Check the installation of the belt and the location of the marks B on the tension lever and the indicator surface of the housing A. If the belt is selected and installed correctly, the mark B should be one third to the left of the indicator surface (see figure 1.8).
[Original material on the website: MERCEDESMAN.ru]