Question about 1994 Chevrolet Astro

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Replacing the serpentine belt tensioner pulley

I need pictures. I can see it. But do I need a johnson bar to take it off.

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  • Anonymous Mar 22, 2014

    tensioner appears fine. the pulley needs to be replaced. Is it as simple as the center bolt in the pulley?

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  • Master
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Johnson bar, crow bar, wrench, or 3/8 braker bar. GM's normally have a square hole where the 3/8s braker bar fits in and you can remove tensioin by using that. Some GM's there is a raised edge that's in a rectangle shape. Using a wrench, not sure the size, you can remove tension with that. You can use a crow bar but the braker bar is much more effective.

Posted on Sep 07, 2008

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1992 4.0l. how can I replace fan belt?


Your vehicle has a "tensioner" under the hood as a separate pulley for the serpentine belt to ride on.
If you want to see a picture of it, go to "e-bay" and type in "92 Explorer belt tensioner."
You will need a socket and a long bar, or a box-end wrench that is long to put on the bolt that is holding the pulley on.
You will rotate that pulley to loosen the serpentine belt to be removed.
You will also do the same to put on the new belt.
You may find they help of another person will be good.
God bless your efforts.

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(1999 pontiac grand prix 3100 v6) how do I remove and replace my serpentine belt successfully?


Instructions Things You'll Need
  • 3/8-inch drive breaker bar
  • Metric socket kit
  • New serpentine belt
    • 1

      Park the Pontiac in a safe work area and open the hood.

    • 2

      Inspect the top of the black plastic cover that surrounds the fan for the serpentine belt routing diagram. This diagram has the instructions for installing the new serpentine belt around the accessory pulleys.

    • 3

      Inspect the front of the engine and locate the automatic belt tensioner. The tensioner on the 1999 Pontiac model vehicles is located between the alternator and the crankshaft pulley. The tensioner has a pulley on one end with a bolt head in the center of the pulley. Use the bolt head to rotate the tensioner.

    • 4

      Turn the tensioner counterclockwise with the breaker bar and a metric socket. Pull the belt out from under the tensioner pulley with your other hand. Then, slowly let the tensioner retract until it stops.

    • 5

      Pull the belt out of the other remaining pulleys. Then, pull the belt out of the engine bay and lay it on the ground.

    • 6

      Route the new belt around the crankshaft pulley. Then, route the new belt around the other remaining pullleys by using the serpentine belt routing diagram for instructions.

    • 7

      Rotate the tensioner pulley counterclockwise with the breaker bar and socket. Then, slide the new belt under the tensioner pulley. Slowly let the tensioner retract until it stops. The tensioner pulls all of the slack out of the belt and brings the new belt to the proper tension. Remove the breaker bar and socket from the tensioner pulley.

    • 8

      Inspect the new belt to ensure that it is seated inside of all the accessory pulleys as directed by the diagram. Then, crank the engine and allow it to run for about 15 seconds. Turn the engine off. Inspect the belt again once more to ensure that
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May 22, 2011 | 1999 Pontiac Grand Prix

1 Answer

Steps to replacing the serpintine belt


release tension on belt by:
-put a socket/breaker bar or ratched on the tensioner pulley bolt and use it to relieve tension on the belt
-slide belt off tensioner pulley. replace with new belt in same pattern across all pulleys and again relieve tension on the tensioner puller to slide the new belt back on
--you may need to remove the bolt on the tensioner closest to the pulley (i don't know just judging by the picture i found)
---if you don't know what the tensioner looks like look up the part on autozone's website for a picture you can match on your car

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1 Answer

How to release a tensioner while replacing Belt pulleys


You place a breaker bar, large screw driver, pry bar, etc...in the notch that is located on top of the tensioner pulley.....The tensioner pulley is located on top of engine near the firewall on the passenger side of car...if you stand at the passenger side of your car and look at your serpentine belt following it around towards the firewall (windshield) the tensioner pulley is at the apex and there is about an 1 1/2" notch at the top of that....that is where you would put your pry bar and you would pull back ( towards the front of your car) on that tensioner and you will see the serpentine belt loosen. I can post a picture is you need one....

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Depending on where you purchase the serpentine belt, and whether it's a budget or lifetime version, prices range from $18 to $33.

You can replace this belt yourself.

The belt goes around, and under various pulleys on your engine. There is ONE pulley that puts tension on this belt. There is a bracket, or 'arm', that this tensioner pulley is attached to. One simply takes a 1/2 inch breaker bar, and inserts it into a 1/2 inch square hole in that bracket.
You then pull the bracket over to one side with the breaker bar, (The direction will be pulling the tensioner pulley away from the serpentine belt), and slip the serpentine belt off of the pulleys.
The belt diagram of how the belt is placed around the pulleys, should be on the fan shroud support, or under the hood.

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1 Answer

Replacing a serpentine belt


Don't have a chart, video, or diagram available at the moment. Can offer you generic advice.

1.Somewhere in the middle of that serpentine belt, that is wrapped around all those pulleys, is an Idler tensioner Pulley. All this pulley does, is put tension on that serpentine belt. Usually located somewhere in the middle.

The Idler tensioner Pulley will be on a bracket. It will be on the end of the bracket. The bracket usually has a 1/2 inch square hole in it. This is used for a tool, that resembles a 1/2 inch breaker bar.
-> I, use a 1/2 inch breaker bar.
The 1/2 inch breaker bar is inserted into this square hole, and the bracket is pulled to one side.
This pulls the tensioner pulley away from the serpentine belt, allowing the belt to have slack, and then the belt is slipped off of one of those pulleys. Release the pressure slowly, remove the tool. Then the serpentine belt is removed all the way.

(The Idler tensioner pulley bracket, can only be moved in one direction, to take pressure off of the serpentine belt. The direction opposite, of it putting pressure on the serpentine belt.

The spring used to put pressure is Very strong. This is also an area, where you can easily slip, cutting your knuckles, or fingers, or hand, on sharp objects. Use caution, you may want to wear a glove, or gloves!)

Then the new serpentine belt is wound around the pulleys in the correct pattern, the Idler Tensioner Pulley is once again pulled to the side, and the last of the serpentine belt is slid into place. Then you slowly release the tensioner pulley, and it puts pressure on the serpentine belt once more.

Make sure the serpentine belt is in the grooves of the pulleys, and is wound around in the correct pattern.

On the car hood inside, or on the radiator support, or perhaps on the inner fender well, or in the Owners Manual, it should show the correct pattern for installing the serpentine belt.

Apr 24, 2009 | 1998 Cadillac DeVille

1 Answer

Serpentine belt replacement.


Locate the automatic belt tensioner, it should have a black plastic pulley on it. Insert a 1/2 inch breaker bar in the hole thats on the tensioner, and pull to relieve the tension on the belt. Slip old belt off the pulley and slowly release the force you have on the bar untill it stops moving. Route new belt, and move tensioner with bar to gain needed slack to get the belt on, Release tension, and remove bar. makeing sure new belt is in alignment.
Be careful...watch for pinch points, around your fingers and hands when performing this job.
Also, check the pulleys and idlers for wear before installing the new belt. They will wobble if the bearings are worn and should be replaced.
Good luck, hope this helps.

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2 Answers

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Look at the diagram which should be on the radiator fan shroud.  This will show you the path the belt takes around the myriad pulleys on the engine.  There is a tensioner pulley whose only job is to maintain the tension of the serpentine belt.  It may be marked on the diagram.  If not, it is the pulley, usually near the top of the engine, that is not the air compressor, alternator, water pump, etc.  I have found that a box-end wrench or a socket wrench which fits the bolt on the pulley, is sufficient.  Just gently swing the pulley away from the belt slightly.  Just enough to release the tension so you can slide the belt off.  You don't have to worry about the bolt coming loose, as it should have far more torque holding it on than you'll put on it to release the belt tension.  Note, that once the belt is off, the tensioner will swing further than it was before, since the belt is not there to stop it.  So when you put the belt back on, you'll have to swing it back down/up to the same position it is in now, if not farther, since the new belt hasn't stretched.

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1 Answer

Serpentine belt replacement


yes you will need to look for the pully that acts as a tensioner it should be identified on your rad support or underside of your hood where you will have a diagram that shows your routing of the s belt it will show you witch pulley the belt goes around and so on it should also identify the tensioner you need to use a big prybar or thwere may be a spot on thhe tensioner to fit a half inch rachet or a johnson bar relieve the tension and remove the old belt and pay close attention as to how the belt comes off and make sure you put it back the same way. hope this helps..

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