Question about 1990 Cadillac Deville

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Installing accessory belt for 1990 cadi sedan deville

I'm not much of a mechanic! original belt shredded! the idler for the what i believe is the water pump was missing two of three bolts!!! replaced bolts and bought new belt. can't get the new belt to tighten. the only tensioner i can find is on top by the alternator. i have the belt matching the diagram under the hood. we matched belt at parts place so its the same size! Are there more tensioners and where are they???

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Ewww.. when the belt shredded, it may have ripped off parts, like additional tensioners. Try buying a service manual for your specific car, and look to make sure of the pathing, and components where the belt is supposed to run. It may laso have loosened other components that act as tensioners, such as A/C compressor, smog pumps, or power steering pumps. Check to see if all these are tight. If you can slide the component along the belt axis, that component will need to be pulled to tighten the belt, and then tightened down to maintain tension.

Posted on Aug 27, 2008

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Serpentine belt was shredding and smoke was coming from under the hood. changed the serpintine belt and it si still smioking


Serpentine belts have an idler pulley and an automatic belt tensioner - either one of these could have gone bad and could cause the smoke. The idler pulley has a bearing inside that can seize, stopping the pulley from turning which would cause the belt to fray. The tensioner keeps the belt tight and when they go, the belt hangs loose, causing the belt to burn on the other components. The Alternator also runs on that belt, as well as the a/c compressor and other components, depending on the particulars of your car ( make, model, engine, accessories, etc.) and the main bearings can be bad there too. There are actually several key components running off the belt and, without being there, I cannot accurately diagnose the issue. I recommend you go to a reputable shop. The type of smell in the burning would guide me to what to check - there are many things that can cause these symptoms. If that mechanic only changed the belt but did not investigate the cause I personally would not go back there.
I'm sorry i couldn't offer anything more concrete to help - hopefully I've given you some directions to look!
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Please remember to leave feedback and vote. Good Luck

REMOVAL
  1. Install a 1/2 inch drive extension into the belt drive tensioner (6).
  2. Push down on the extension to release tension.
  3. Remove the drive belt from the power steering pump (13
  4. Slowly return the tensioner to the original position.
  5. Remove the belt.
INSTALLATION

  1. Thread the drive belt through all the pulleys except for the power steering pump (1) and the drive belt tensioner (6).
  2. Insert a 1/2 inch drive extension into the drive belt tensioner.
  3. Push down on the tensioner and feed the belt around the tensioner wheel.
  4. With the tension applied, complete the belt routing. Make sure the belt is properly seated in all pulleys.
  5. Slowly return the tensioner back to its original position. This will apply tension to the drive belt.
  6. After installation, check the belt for proper seating on the pulleys, proper routing and alignment.
  7. Start the engine and check for proper belt and accessory operation.

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Removal & Installation

  1. Rotate the drive belt tensioner clockwise and remove the drive belt.
    WARNING Never suddenly let go of the tensioned idler pulley. The force of the spring pressure suddenly released may damage the idler pulley mechanism. Always release the spring pressure gradually.


    0996b43f80204f01.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Rotate the belt tensioner to relieve tension on the belt-4.6L engine shown, others similar


To install:
  1. Route the belt over the pulleys making sure all the grooves in the pulleys and the belt line up correctly. Refer to the accessory belt routing section of this manual.
  2. Rotate belt tensioner clockwise and slip drive belt over idler pulley on tensioner.

  1. Rotate the drive belt tensioner clockwise and remove the drive belt.
    WARNING Never suddenly let go of the tensioned idler pulley. The force of the spring pressure suddenly released may damage the idler pulley mechanism. Always release the spring pressure gradually.


    0996b43f80204f01.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Rotate the belt tensioner to relieve tension on the belt-4.6L engine shown, others similar


To install:
  1. Route the belt over the pulleys making sure all the grooves in the pulleys and the belt line up correctly. Refer to the accessory belt routing diagrams above.
  2. Rotate belt tensioner clockwise and slip drive belt over idler pulley on tensioner.
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