Table of contents: Checking the accessory drive belt…🠇 Checking the drive belt using the…🠇
The accessory drive belt transmits power from the crankshaft pulley to accessory units such as the power steering pump, air conditioning compressor and alternator. An automatic tensioner is used to adjust the belt tension. The vehicles are equipped with poly V-belts.
If the belt or tensioner is faulty, the belt may slip on the pulleys, causing loss of power and other problems.
The main symptoms of a belt malfunction may be the following signs:
- battery discharge;
- the low battery warning light comes on when the ignition is turned on;
- noise from the generator and belt drive.
Checking the accessory drive belt and tensioner
Make sure the accessory drive belt is located in the groove and runs in line with the pulleys.
Check the belt for wear. If the belt shows obvious signs of damage (wear, chipping, etc.), replace it.
If the belt tensioner (bearing) is faulty, replace the tensioner.
Check the tension of the accessory drive belt. The belt tensioner should adjust the tension so that the belt does not slip on the alternator pulley.
Checking the drive belt using the dynamic tensioner marks
Dynamic Tensioner:
a - gauge hole;
b - maximum elongation mark;
c - zero stretch mark;
d - belt stretch control mark (fixed on the engine).
The dynamic tensioner marking pattern allows monitoring of accessory drive belt elongation.
Perform a visual check of the drive belt extension on the dynamic tensioner. If the marks "b" and "d" match, the belt needs to be replaced.
Caution: Before removing, mark the direction of rotation of the accessory drive belt.
Remove the accessory drive belt (see section "Engine and control systems").
Check for hard spots, noise or oil marks on the dynamic tensioner and on the accessory pulleys.
Install the accessory drive belt (see section "Engine and control systems").
Rotate the engine four revolutions and check the extension of the accessory drive belt. The belt must be correctly installed on the dynamic tensioner and in the pulley grooves.