What would cause a serpentine belt to burn off?
Serpentine belt problems usually result from one of three causes: a defective belt tensioner; misalignment of a pulley; or, defective bearings in the tensioner, idler, or one of accessories driven by the belt (including the water pump).
What is the most common cause of belt slippage?
Improper belt tension is the most common and obvious cause of slip, which generates unwanted heat. The friction that occurs when a V-belt slips in a pulley causes belt sidewalls to become glazed, and decreases gripping ability.
How do you fix a slipping belt?
If your belt is slipping because the rubber is starting to dry out, then belt conditioner will stop the squeak by softening it and moisturizing it. If your belt is getting dried out, spray both sides with belt dressing and let it soak into the belt before spraying it again.
How to troubleshoot a V belt belt failure?
Carefully align the flat idler on the slack side of the drive as close as possible to the driver sheaves Check machine components and guards, motor mounts, motor pads, bushings brackets and framework for stability, adequate design strength, proper installation and proper maintenance.
Can a timing belt break through a crankshaft pulley?
You can also notch the subframe. If your belt has started to shred, pull over immediately! If the belt works its way around the crankshaft pulley, it can break through the front main seal and even work its way into the timing belt. Best case scenario: the main seal needs to be replaced (oil leak).
Can a serpentine belt cause a BMW to self implode?
Much worse, the belt causes the motor to jump timing and self-implode. No one wants that, so be sure to check behind the crankshaft pulley for belt fragments. If the belt wrapped around the backside of the pulley, remove it and carefully inspect the front main seal.
What causes BMW 135i serpentine belt to sag?
The pulley would hit the subframe and shred the belt or break the pulley. This was caused by worn motor mounts, allowing the motor to flex and sag when accelerating. However, this issue only affected N54 cars produced up until 04/2008. Apparently BMW addressed the issue at that point.