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In 2004, the Buck Regal came in just two trim levels, GS and LS. The Regal LS was the base model and boasted a relatively tame 3.8-liter, V-6 engine that pumped out 200 horsepower. The GS model, on the other hand, featured the same 3.8-liter V-6; but a supercharger bolted to the engine helped it to pump out an extra 40 horsepower. Replacing the serpentine belt is the same process on both models, but the GS model requires you to first remove the supercharger belt before you can access the serpentine belt.
Items you will need
- Breaker bar
- 15 mm socket
Find the serpentine belt routing diagram under the hood. If the diagram is missing or illegible, draw your own diagram of the direction the serpentine belt routes over the pulleys, using a pen and piece of paper.
Place a breaker bar and 15 mm socket on the bolt in the center of the tensioner pulley – the pulley just under the supercharger toward the rear of the engine compartment – and rotate the pulley clockwise to relieve the tension from the belt. Pull the belt off of the tensioner pulley, then allow the tensioner pulley to slowly rotate back to its resting position.
Pull the belt off of all the other pulleys and put of the engine compartment.
Route the new serpentine belt over all of the pulleys on the engine except the supercharger, using the belt routing diagram as your guide.
Rotate the tensioner clockwise until you are able to slide the belt into the grooves on the supercharger pulley. Allow the tensioner to slowly rotate counterclockwise until it holds tension on the belt.
Verify that you routed the belt correctly over each pulley and that you seated the belt fully into each pulley. Relieve tension on the belt and make minor adjustments, if needed.
Find the serpentine belt routing diagram under the vehicle’s hood. If the diagram is missing or illegible, draw yourself a diagram of how the belt routes over and through the pulleys.
Connect a breaker bar and 15 mm socket on the bolt in the center of the tensioner pulley – the pulley just under the alternator, hear the top of the engine – and rotate the breaker bar counterclockwise to relieve the tension from the belt. Pull the belt off of the alternator pulley and allow the tensioner to slowly rotate back to its resting position.
Remove the belt from the rest of the pulleys and pull it out of the engine compartment.
Install the belt around all of the pulleys on the engine except the alternator pulley, using the routing diagram or your drawing as a guide. Rotate the tensioner pulley counterclockwise until you can route the belt over the alternator pulley. Allow the tensioner to rotate clockwise until it holds tension on the belt.
Verify that you routed the belt over all of the pulleys correctly and that you've fully seated the belt in each pulley. Relieve tension on the belt and make minor alignment adjustments, if needed.
Reinstall the supercharger belt, if applicable, by following the steps in Section 2.
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