The Tensioner Pulley Bearings are failing and either the Tensioner Pulley or the Tensioner Assembly (Pulley, Arm and Base) must be removed and replaced.
Click on the following free direct Link. It has several of the Serpentine Belt Diagrams and Tensioners that are possible with your 4.3L V6 engine.
http://www.2carpros.com/car_repair_information/year/1998/make/gmc/model/jimmy/1998_gmc_jimmy_drive_belt_routing_diagram.htm
1. Remove the Serpentine Belt.
"HOW TO":
Standard Rules to Removal the Serpentine Belt with a Tensioner:
A. Find the Tensioner(s). (See Diagrams on Link)
B. Using a Serpentine Belt Tensioner Tool, Or Wrench OR Ratchet, Rotate/Move the Tensioner USING THE AVAILABLE NUT (on the Pulley or Arm Base) OR the OPENING (3/8ths or 1/2 inch square opening) rotating the Tensioner Pulley/Arm - moving it away from contact with the belt and towards the area where the belt is not in contact with the Tensioner Pulley. The Tensioner is spring loaded, and is hard to rotate/move.
C. Remove the loosened belt off one of the other more easily accessed Pulleys.
D. DO NOT quickly release the Tensioner, but gently allow the Tensioner to rest in its closed position.
Removing the Tensioner Pulley: See the Diagrams in the Link.
After the Belt has been removed, with the Tensioner resting:
DEPENDING ON WHAT TYPE TENSIONER:
IF the Tensioner Pulley itself HAS a Bolt Head showing, SOME of these bolts can be removed and the Tensioner Pulley replaced.
IF the Tensioner Pulley itself DOES NOT HAVE a Bolt Head showing, then go to the Tensioner Base located at the end of the Tensioner Arm. This should have a Bolt Head Showing. Remove this Bolt and the whole Tensioner Assembly will com off.
When replacing the Tensioner Assembly - MAKE SURE you place the protruding "nipple" on the underside base of the Tesnioner into the appropriate cavity on the engine face.
Standard Rules for Installing the Serpentine Belt with Tensioners:
a. Pick a Pulley that is most easily accessed. This will usually be on top. This will be the last Pulley that the belt will go on.
b. Using the Diagram: Install the new Serpentine Belt on the remainder of the Pulleys....over, under, left right.
c. Using a Serpentine Belt Tensioner Tool or Wrench or Ratchet Tool: Rotate/Move the Tensioner Pulley/Arm "away" from Belt contact area on the Tensioner. This spring is pretty hard and with a new belt, it will be even harder to install. Rotate/Move this to as-close to the maximum allowed inorder to have enough slack in the belt to get it up and over the last pulley.
d. Using your other hand - Pull the Belt up and over the Last remaining Pulley.
e. Before releasing the pressure on the Tensioner, visually inspect the remainder Pulleys and the Belts' Positioning on them
Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.Com!
SOURCE: 2003 impala was making squealing noise from
Remove the belt, and check each pulley for resistance, or play. Each pulley should turn with ease, and have little to no play. Replace any pulleys that are found to be faulty. Check for pulley alignment. If the Crankshaft Pulley or any other pulley has loosened up, or not aligned properly, the belt will come right off. This is usually due to a frozen or faulty Idler Pulley or Tensioner Pulley. If all else checks out, ensure that the ribs are properly installed on each pulley, and no ribs are hanging off of any pulleys.
I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514
SOURCE: audi serpentine belt problem
are you sure you put it on the right way go to autozone.com and get a belt diagram. did you put the belt on upsidedown?
SOURCE: change serpentine belt and tension pulley and idle pulley and
could be the alternator, water pump
take the belt and spin all the pulleys and listen for noise and make sure they turn smoothly
another trick is to take a can of wd40 or equivalent and spray the bearings 1 at a time till the noise goes away or quiets down
SOURCE: Jeep cherokee country tensioner pulley noise
May be a weak tensioner that needs replacing. Make sure you clean pulleys well with brake cleaner or similar as well. I have had one with similar problem, that Gator back belt was causing it. I'm not 100% convinced that a notched belt will get as good a grip as a complete rib all the way around the belt. Just doesn't add up to me. If you compare that to tire grip, then you'd be telling me that snow tires would work better on the Nascar circuit?
SOURCE: 2006 Nissan frontier 4 cylinder belt diagram + tensioner pulley
They are under the hood or on the front crossmember.
Regards,
matt
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