Accessory Drive Belt Tensioner - Dynamic Check
WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Incorrect accessory drive belt installation will cause excessive drive belt wear and may cause the drive belt to come off the pulleys.
The accessory drive belt tensioner may be checked dynamically as follows:
- 1.
With the engine running, observe the accessory drive belt tensioner movement. The accessory drive belt tensioner should move (respond) when the engine is accelerated rapidly or when the A/C clutch cycles ON and OFF (the degree of movement can be up to 4 mm). If the accessory drive belt tensioner movement is not constant without engine acceleration or A/C clutch cycling, a pulley or shaft is possibly bent, out of round, or the damping mechanism inside the accessory drive belt tensioner may be damaged. INSTALL a new accessory drive belt tensioner as necessary. Refer to Accessory Drive Belt Tensioner .
TEST the system for normal operation.
- 2.
Excessive accessory drive belt rideout (uneven depth of grooves in the accessory drive belt) may cause excessive accessory drive belt tensioner movement. Check the condition by installing a new accessory drive belt. Refer to Accessory Drive Belt .
TEST the system for normal operation.