A - coolant pump; B - crankshaft; C - generator; D - servo pump; E - air conditioning compressor; F - tension roller.
V-belts must withstand heavy loads with today's powerful generators. This results in a stronger V-belt tension.
- Too little belt tension leads not only to insufficient transmission of rotation to the generator, but also to belt slippage and premature wear on the sides.
- If the belt tension is so weak that it slips when the crankshaft pulley is sharply accelerated, uneven wear marks can be seen on the side surfaces of the belt.
- Too much belt tension will damage the alternator bearings. In addition, the V-belt will stretch over time.
- If from the engine, except for the generator and the coolant pump, on the engine type «F» other units, such as the hydraulic steering pump and/or the air conditioning compressor, are also driven, this is done by means of a so-called profile belt, which is held at the required tension by the tensioning roller.
- To check the condition of the belt, rotate the engine a few revolutions.
- Only in this way can you see the entire surface of the V-belt. Often the belt has only one single, but deep crack, which, when checked, can be located just on the pulley.
- A torn or worn belt must be replaced.
Replacing a V-Belt or Ribbed V-Belt
Under no circumstances must the V-belt be moved along the pulley with a screwdriver, otherwise damage to the V-belt due to a damaged spot on the pulley will already be predetermined.
1. Engine type «WITH»: Loosen the tension bolt of the mounting bracket.
2. Lower the pivot bearing bolts.
3. Press the generator towards the engine.
4. Remove the V-belt.
5. Engine type «F» (conventional design): Release the tensioner completely. To do this, first loosen the bolt in the adjusting groove of the mounting bracket.
6. Release the fastener in the pivot bearing.
7. Tilt the generator and remove the V-belt.
8. Motor type «F» (with power steering or air conditioning): Loosen the center nut and pull the tensioner away from the belt.
9. Remove the belt from the pulleys. In this case, you should remember or mark the belt path for reassembly.
10. When the new V-belt is installed, start the engine and let it run for 10 minutes, and then check the belt tension again.
Replacing the tension roller
With servo or air conditioner
Loud bearing noise does not always indicate a problem with power steering or air conditioning - more often than not, a worn idler bearing is the source of the noise.
1. Remove the V-belt as described above.
2. Turn off the central bolt and remove a tension roller from the holder.