Question about 1999 Pontiac Grand Prix

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GP with 3800 V6 keeps shedding the serpentine belt.

Car shed the serpentine belt so pulley and bearing on tensioner were replaced. Car kept shedding belt so water pump and alternator were replaced as both were old. But belt keeps being shed.

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  • Pontiac Master
  • 2,100 Answers

You have got something out of whack there, take a straight edge, like a metal ruler or framing square and line up the pulleys, try to find one that is out of whack. Wiggle the crank pulley and see if it is loose. If the belt is off, wiggle all the pulleys to see if one is loose. One of the pumps, comp, alt, etc, is either bent or has a broken bracket. Is the tensioner tight? Too tight? It should be ok if nothing squeals. Hope this helps.

Posted on May 04, 2010

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Posted on Jan 02, 2017

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Need to replace serpentine belt without ac on a 2007 chev impala ac compressor bad need to bypass. can this be done


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1 Answer

Tension pulley for serpentine belt making noise


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!

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1 Answer

1995 FORD TAURUS 3.0 V6


hi,

let me clarify the belt names for you before that, the fan or serpentine belt is the belt which all the accessories run on like the alternator and power steering pump and is different from the timing belt completely. the timing belt is hidden away and you cannot see it on most cars and keeps the camshaft in sequence with the crankshaft, Im not entirely sure but I believe ford V6s have a timing chain. heres the deal, the idler tensioner pulley has to have some tension put on it to bend it up and out of the way while you place the serpentine belt, study the ider tensioner pulley closely and the diagram under the hood, the idler pulley has a large bolt in the middle which you have to put a socket and wrench on .using force against the spring loaded pulley, either push down or up on the pulley with the wrench to temporarily give you the clearance needed to set the belt and gently release, (having a helper helps) once you doublecheck that the belt is PERFECT then start the car. My 83 LTD's idler pulley is adjusted with a bolt, I believed they have changed it to the spring loaded design that I spoke about above, if its the spring loaded design, that should do it,
good luck

J

Jun 14, 2008 | 1995 Ford Taurus

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