This serpentine belt is still in good shape, no need to replace it yet. This serpentine belt shows cracks, it needs to be replaced. Read Next: Timing belt: when should it be replaced, what happens if it breaks Alternator, how it works, symptoms, testing, problems, replacement Car maintenance checklist with photos Check Engine light: what to check, common problems, repair options Learn your car: how different car parts and sensors work. Related Articles: Check Engine light: what to check, common problems, repair options.
All rights reserved. To figure out which one, check each against other pulleys until you isolate the one that is out of line. Serpentine drive pulleys on alternators and air conditioning compressors are often pressed onto their shafts by the component manufacturer.
So, when the accessory is replaced, the pulley is replaced with it. Even pulleys that must be transferred from an old component to a new one, as is often the case with power steering pumps, are often press-fitted.
If the pulley is not installed in line with the other pulleys, the pulley must be moved to line it up. Moving pressed-on pulleys in or out on the shaft requires special tools: a puller and an installer, or a tool that combines both functions. There is no universal tool that works on all cars, though most will work on most domestic models.
Some auto parts stores will pull and install a pulley and can realign one if you know the extent of the adjustment required. Angular misalignment usually results from worn bearings in an engine accessory.
To check bearings in one of the belt-driven accessories, turn the accessory by hand and listen for noises and feel whether the shaft turns smoothly. Also pull the shaft to the side and attempt to push it in and out to see if it wobbles or has any end play. All of these are indications of worn bearings. With a water pump, also check to see if there is any fluid leaking from it. Coolant leaking from the weep hole means it is time for a new water pump, but it also may indicate that the water pump bearings are worn.
If the water pump is leaking, check the serpentine belt for signs of fluid contamination. Certain vehicles have known serpentine belt problems, such as — Chrysler-built minivans with the 3. These are notorious for throwing the belt when driving in heavy snow or through a large rain puddle. This results from a design flaw: an engine mount bracket to which one of the idlers is attached causes a slight misalignment of the pulley.
There are two cures: replace the bracket with an updated part, or retrofit an aftermarket kit from Gates that uses a dual-sided serpentine belt with a new tensioner and idler designed for that belt. Some of that information may be unreliable, so use common sense in deciding what to believe. At first I was inclined to say that most seasoned enthusiasts and professional builders are beyond the scope of this book.
But I've seen what often passes as traditional or period correct and in light of that I wholeheartedly recommend it, especially to those who've convinced themselves that they know it all. Close menu. Fortunately, the belt can help you diagnose the problem, both before you remove it and afterward: Squealing sound: Belt slipping Chirping sound: Misalignment of an accessory drive pulley Frayed belt edge: Misalignment of an accessory drive pulley Polished belt edges: Belt slipping Glazed belt grooves: Belt slipping Fluid contamination: Oil, power steering, or coolant leak Excessive cracking: Other than severe old age, defective tensioner Whirring sound: defective bearing in tensioner pulley or idler pulley Rhythmic noises occurring at engine speed: Delaminating belt backing, chunking of belt ridges, or foreign object embedded in belt groove Grinding sound: damaged bearings in driven accessory Belt coming off: Pulley misalignment, belt misalignment on pulley, defective tensioner, or bearing wear in tensioner, idler or driven accessories Belt noise can be hard to isolate, as the sound may seem to be coming from an accessory drive, such as the alternator or air conditioning compressor.
Chevy Hardcore. The tensioner does exactly what it's name says- keeps tension on the belt. Without tension the belt will come right off. This is the part that you must adjust or release the tension to install the belt. Another possible cause is that one of the components with a pulley that the belt rides on is worn out and not sitting perfectly straight. The idler is different than the tensioner. It is a solid pulley that just keeps the belt riding true.
What happens is that the bearing for any of these pulleys the belt rides on is worn out, so the pulley either wobbles or does not sit flat and gives the belt a chance to "walk" off the pulley. A worn out pulley will usually be accompanied by a growl or whining noise when the engine is running. You may also see that the belt is worn out on one edge. My daughter has a Altima 3. Has a new tensioner a new idler and new power steering pump. I dont know how old this is, but, may help for future browsers.
My dodge nitro kept throwing serpentine belt and after checking tensioner and replacing belt and idler I found there was a bolt missing in the power steering pump. Causing it to wiggle. Replaced bolt and tightened up pump, no more throwing the belt.
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