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several possible reasons
build up of worn belt in the teeth of the gears
incorrect belt being used (wrong pitch belt being used -not genuine)
shafts being driven are not free to turn--seizing on the bearings, incorrect placement of rocker shafts /pushrods---valve springs bottoming out locking the shaft
incorrect tensioner actioner ( hydraulic tensioner not tensioning properly allowing the belt to flap in operation)
idler pulley problems ( bearings or misalignment of all pulleys
Absolutely NOT! The pulley shown looks like the belt tensioner....drive this vehicle without the belt and tensioner and the engine will burn-up. Get the vehicle towed to a shop and get this tensioner replaced. From the look of the picture, the pulley isn`t the only thing broke or damaged.
Anytime a part falls off your vehicle, do not drive the vehicle until you get it fixed.
an engine /vehicle model with information of power steering and ac fitment would help. Basically the grooves in the belt go into the grooves of the pulley and any idlers run on the back ( flat) part of the belt. If you have grooves in the belt running over a flat idler pulley then the belt is fitted wrong.
I believe I know the noise that is troubling you. If a new belt is correctly tensioned and still makes such a noise it would indicate either contamination with oil or similar or pulleys that are less than perfectly aligned
The noise and your description is symptomatic of slippage and the pulley that is most likely to be slipping is the small alternator pulley. After starting and when accessories are being used that require a significant current the alternator needs considerable power to drive it in order to produce that current/replace the battery power used to start the engine.
The increased power to drive the alternator must be delivered via the drive belt. As the battery voltage rises the charge rate will fall and the power needed to drive the alternator falls and so the squealing reduces and then stops.
One further thing to note is an engine and it's ancillaries expand or grow quite a lot in engineering terms as it warms up, this has a tendency to tighten the drive belts further.
There will be if the camshafts jumped timing. Check the marks on your camshaft and see if they are relatively close, usually if they are two teeth or more apart then engine damage has occured, however even if it jumped more there is still a chance that the engine was not damaged.
if you are talking about the serpentine belt which drives the alternator / water pump etc, it may be falling off if it is miss-routed or if any of the pulleys are out of alignment or if the belt tensionr is not properly tightened, the tensioner is the pulley which bears on the outside of the belt (smooth side) this pulley may be gummed up and give you the impression it doesnt move clean it up loosen it off
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