Senin, 16 Mei 2011

How to Replace a 2003 Toyota 4Runner Serpentine Belt

How to Replace a 2003 Toyota 4Runner Serpentine Belt

While the 2003 Toyota 4Runner came with several different engine options, the 4.0-liter and the 4.7-liter engines are the only two that use a serpentine belt to drive all the accessory pulleys. The process for changing the serpentine belt on both engines is identical; the only difference is the location of the pulleys and belt tensioner. Serpentine belts are available through Toyota or auto parts stores.

Difficulty:
Moderately Easy

Instructions

things you'll need:

  • Wrench set
  • Socket set
  • Ratchet
  • Replacement serpentine belt
    • 1

      Open the hood of the 4Runner. Locate the negative battery cable on the battery, and remove the mounting bolt with a wrench. Remove the negative cable and set it aside, isolating it from the battery while you work.

    • 2

      Locate the serpentine belt automatic tensioner on the front of the engine. The tensioner is a spring-loaded arm with an idler pulley on the end of it. It applies the proper amount of tension to the serpentine belt, keeping it tight on all the pulleys.

    • 3

      Place a socket and ratchet on the mounting bolt in the center of the tensioner's idler pulley. Turn the ratchet counterclockwise, releasing the tension on the belt. Remove the belt from the pulleys.

    • 4

      Slowly turn the ratchet on the tensioner clockwise, allowing the tensioner to return to its free arm or home position. Install a new serpentine belt onto all the pulleys except the tensioner.

    • 5

      Rotate the tensioner counterclockwise with your ratchet, and slide the new belt on to the idler pulley. Turn the ratchet clockwise, allowing the tensioner to tighten the new belt as you go. Remove the socket and ratchet from the idler mounting bolt.

    • 6

      Check the belt, making sure that the ribs on the belt and all the pulleys align correctly. An incorrectly installed serpentine belt can damage the accessories, the belt or the pulleys.

    • 7

      Connect the negative battery cable to the negative battery terminal, and install the retaining bolt. Tighten the bolt with a socket and ratchet or wrench. Start your 4Runner and visually verify that the belt is running true over the pulleys.

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