How to loosen alternator belt tensioner on 2004 Renault MEGANE?

SOURCE: Serpentine Tensioner for 2000 Ford Escort ZX2

normally you can take a 1/2inch breaker bar and insert it in the hole on the tensioner pull down and take the belt off the alternator and also try autozone.com to see if they have your car listed for diagrams pictures and step by step instructions if your car is not listed then try your local library they have all the car manuals and even copy them for you

SOURCE: How to loosen alternator tension on a 2003 Lancer

I have not seen this vehicle but, the center bolt or nut that holds the tensioner to the block is backed off two turns first.
Then the adustment bolt (most are accesed from under the vehicle) can be adjusted to give enough slack to install the new belt.
If this is still too tight, remove one of the two or two of the three bolts that mount the Alternator to allow for another 1/8" and install the belt.
Then remount the Alternator.
Then readjust the tension bolt.
Finish with the bolt or nut that mounts the tensionor to the block.
good luck.

SOURCE: Cannot find the tensioner pulley to put my alternator back on

The smooth rounded tensioner pulley has a 1/2 inch drive recessed ratchet drive fitting in the outer side of it. Reach down and feel it with your fingers and insert the ratchet drive into it. Look around the underside of the hood and engine bay for a small diagram showing the belt, pulleys and tensioner.

This pulley is either a slider or a spring loaded pulley. If it is a slider, there will be one or two bolts with "slide" areas that the bolt can move through, and possibly a third bolt that controls the tension. If it is a spring loader, there will be a pulley that looks like it is on a lever. There will be a "bolt" type head, a hole for a ratchet, or a square area on the end of the lever to twist it away from the belt. If it is one of these, the belt tensioner will move relatively easy.

Jim DuBreck

• 578 Answers
• Posted on Oct 23, 2009

SOURCE: can't find tensioner and how to loosen belt to change alternator

Just a clue: the water pump and the tensioner are the only items that run off the BACK side of the belt.

So, it is the pulley that is NOT the waterpump- and it will have a 9/16ths nut sticking out of it (so that you can put a wrench on it to remove tension from the belt)
Does this get you moving in the correct direction?
-Jim

SOURCE: How do I loosen the tensioner to replace the

First, note how the drive belt is routed, then use a wrench on the tensioner pulley center bolt and turn the tensioner clockwise (four cylinder engine) or counterclockwise (six cylinder engine) to release the drive belt tension. Remove the drive belt from the tensioner and relax the tensioner. Fit the new belt on the other pulleys, then turn the tensioner again and fit the new belt over the tensioner.

The picture is from a different model, but it is similar to what you are working with.


Hope this is helpful to you.