F150 Whine.....2 options

[Stangman Jonathan]

Well its not the Alternator...swapped a new one into today along with a new belt.....its the damn idler pulley from what it sounds like now! So not done on this project lol.

[Stangman Jonathan]

it was the tensioner pulley. Mac is all good now, time for the headers and xpipe now and air horn

[Cobra Jet]

Next time you hear a squeal or noise coming from the front engine accessories (this applies to any vehicle), with the engine OFF, pull off the serpentine belt and manually by hand, spin each front accessory pulley... you will surely find the culprit in this manner w/o (and unfortunately) throwing parts at the vehicle. It's a sure fire way to determine where a "noise" is coming from...



The tensioner and idler pulley are the culprits on most of the F-Series Fords, Explorers, Mountaineers, Navis, etc... For whatever reasons, the bearings used in those pulleys are prone to premature failure. One other tip - in most of the pulleys, that center bearing can be pressed out and a new bearing can be installed (instead of having to purchase a new tensioner assembly OR a new idler assembly). Most folks don't know that, but it can be done. All bearings have a part # scribed into them - find the same bearing manufacturer & part # online, order it up and that's the cheapest route to fixing a bearing issue...

[Stangman Jonathan]

yup I replaced the tensioner pulley and that was it, sucks I didn't know of it before swapping the alternator lol And I just bought a new tensioner because I had read that after as well.