Question about 2000 Mazda 626

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I have a 2000 mazda 626 4 cylinder, and I am trying to replace the serpentine belt. I seem to missing something because there is too much slack left in the belt. Where does this belt attach to?

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The belt is tightened by the TENSIONER pulley. That is a spring loaded smooth pulley the runs on the back side of the belt. After you have the belt on all the pulleys and IN THE PROPER SEQUENCE from pulley to pulley, the TENSIONER pulley has to be held away from the belt. The belt is slipped under the TENSIONER pulley and the pulley is slowly released to tighten the belt. If you have done all that and the belt is still loose, it may be the wrong size or you have it on the engine pulleys incorrectly. If you haven't moved the TENSIONER pulley to remove the old belt or the belt broke, you need to find the TENSIONER pulley and then carefully retract it. Here are some general instructions on the TENSIONER pulley, if you need them.

When you look at the serpentine belt, somewhere near the top you will see it runs over a smooth pulley. You will also notice that pulley is running on the back side of the belt. Most cars will have an arm that holds that pulley and is connected to a round housing approximately the same diameter as the pulley. That is the TENSIONER pulley and in the round housing is a very strong coil spring. In the center of the pulley there should be a hex nut. Put a socket the size of the nut on a long breaker bar and put it on the pulley nut. You should be able to move the pulley away from the belt by "turning" the nut. You may need to use a piece of pipe or other method to lengthen the breaker bar in order to turn it. As I said, it is a very strong spring. While holding the pulley away from the belt you can slip the belt off the nearest and smallest pulley. Then carefully and slowly release the breaker and allow the pulley to return to its released position. THIS CAN BE A DANGEROUS OPERATION THAT LOOKS SIMPLE. IT IS SIMPLE BUT BE AWARE THAT YOU MUST BE SURE YOU HAVE THE TENSIONER PULLEY UNDER CONTROL WITH THE BREAKER BAR AND THAT YOU CAN HOLD IT WHILE POSITIONING THE BELT UNDER THE PULLEY. IF IT SLIPS FROM YOUR BREAKER OR YOU CAN'T HOLD IT YOU COULD BE SEVERELY INJURED. TRY MOVING AND SLOWLY RELEASING THE PULLEY BEFORE YOU ATTEMPT TO PUT THE THE BELT UNDER THE PULLEY. GET HELP OR TAKE IT TO A QUALIFIED MECHANIC IF YOU ARE UNSURE!! Also, be sure you note the track of the belt before you remove it, so you can reinstall it. Some cars have a diagram of the belt, showing how it winds it way across all the pulleys. When you reinstall it, be sure the belt is properly aligned on all the pulleys before starting the engine. Be careful and good luck!

Posted on May 23, 2011


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