Question about 1992 Lexus Ls 400

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Serpentine belt diagrams install new belt &cost

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The diagram should be under the hood. If you have a 3/8" socket breaker bar you connect it to the tensioner turn it to release the tension on the belt. The tensioner will want to spring back and apply tention to the belt. While you have the tension off you can slip the belt off. Once the belt is off you can release the tensioner and put the new belt on. Once the belt is back on almost you have to pull the tensioner back releasing the tension and slip the belt into it's final resting place and slowly putting tension back on the belt. The tension on the belt is extremely strong and if you are not careful you can smash or snap your fingers off when putting tension back on the belt if your fingers are between the belt and a pully. The cost of a belt is about $50 on most cars and you can do it in about 15 minutes with out taking anything apart. Look for a youtube video on Serpentine belt change on a Suburban or a Corvette it is the easiest type of car to do it on and will give you an idea of how to do it on a front wheel drive car which is a bit harder because of how the engine is placed under the hood. Same deal though with a tensioner and 3/8" socket wrench.

Posted on Sep 23, 2014

  • NedB
    NedB Mar 19, 2016

    is it just as easy to replace tensioner as well??

    i have 1993 ls400 and that is making noise, the guy at shop quoted me 650 , i said what? he said tensioner costs 390 , i went and found tensioner for 120 on amazon and belt for 25 , the guy wants 100 for labor, so i'm thinking if it's easy(i see only 4 screws on tensioner) i might as well do it myself. so instead of 650 dolars it would be 145

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  1. 1 Check to ensure the Sienna's engine is cold, then make sure the Sienna is in park, the ignition is in the off position and the key is removed from the ignition to prevent any possibility of the engine engaging during the serpentine belt replacement.
  2. 2 Open the hood and locate the serpentine belt routing diagram sticker on the side of the engine casing. Study it for a moment before removing the existing belt. It is essential the new belt be installed exactly as the diagram indicates.
  3. 3 Find the tensioner pulley, the main pulley that controls the serpentine belt, and fit a 1/2-inch socket wrench over the self-tensioner on the outside of the pulley.
  4. 4 Pull the wrench to the left to move the pulley forward, which loosens the belt, then remove the belt.
  5. 5 Compare the old serpentine belt with the new, replacement belt for length, width and number of grooves on the belt's underside. Be certain the replacement belt is the right part.
  6. 6 Fit the new belt on to each pulley according to the serpentine belt routing diagram on the manufacturer's sticker, or according to the drawing made prior to removing the old belt. Fit the new belt on to the tensioner pulley last, again applying pressure on the pulley's self-tensioner with the half-inch socket wrench to loosen the pulley.
  7. 7 Release the pressure on the self tensioner and allow the tensioner pulley to ease back into place, thereby tightening the new serpentine belt with the appropriate tension.
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Click on the following free direct Link. It has the Serpentine Belt Diagram and Tensioner location for your 2002 GMC Envoy. Plus Instructional and Directional Diagrams you will find very useful.

http://www.2carpros.com/car_repair_information/year/2002/make/gmc/model/envoy/2002_gmc_envoy_drive_belt_routing_diagram.htm

GENERAL/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.

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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Click on the following free direct Link. It has the Serpentine Belt Diagram and Tensioner location for your 2003 Chevy Impala.

http://www.2carpros.com/car_repair_information/year/2003/make/chevrolet/model/impala/2003_chevrolet_impala_drive_belt_routing_diagram.htm

GENERAL/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.

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.


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