Replacing the serpentine belt on an Aston Martin DB9 is a task that requires careful attention to detail and the right tools. click here for more details on the download manual…..

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Here’s a step-by-step guide to help you through the process, along with detailed descriptions of each component involved.

### Tools and Materials Needed

1. **Tools:**
– Socket set (including metric sockets)
– Wrench set
– Torque wrench
– Pliers
– Screwdrivers (flathead and Phillips)
– Belt tensioner tool (if necessary)
– Mechanic’s gloves
– Safety glasses

2. **Materials:**
– Replacement serpentine belt
– Belt dressing (optional)

### components Involved

1. **Serpentine Belt**:
– A long, continuous belt that drives multiple peripheral devices in the engine, including the alternator, power steering pump, water pump, and air conditioning compressor.

2. **Belt Tensioner**:
– A spring-loaded device that maintains tension on the serpentine belt. It automatically adjusts as the belt wears.

3. **Idler Pulley**:
– A pulley that helps guide the serpentine belt and keep it on track. It does not drive any accessories.

4. **Accessory Pulleys**:
– Various pulleys that the serpentine belt drives, including those for the alternator, power steering, and air conditioning.

### Steps for Serpentine Belt Replacement

#### 1. Preparation
– **Safety First**: Ensure the vehicle is parked on a level surface, the engine is off, and the keys are removed from the ignition.
– **Disconnect the Battery**: Use a wrench to disconnect the negative terminal of the battery to prevent any electrical shorts.

#### 2. Locate the Serpentine Belt
– **Access the Engine Compartment**: Open the hood and locate the serpentine belt on the front side of the engine. The DB9’s V12 engine has a specific routing for the belt.

#### 3. Inspect the Belt
– **Check for Wear**: Before removal, inspect the belt for signs of wear, such as cracks, fraying, or glazing. This will confirm the need for replacement.

#### 4. Note the Routing
– **Belt Routing Diagram**: It’s essential to take a picture of the belt routing or refer to the owner’s manual for the correct routing path before removing it. This will ensure you install the new belt correctly.

#### 5. Release Tension
– **Locate the Tensioner**: Find the belt tensioner, which is typically a spring-loaded pulley.
– **Use a Tensioner Tool**: Insert the belt tensioner tool or a wrench into the tensioner pulley bolt and rotate it to relieve tension on the existing serpentine belt. This allows you to slide the belt off the pulleys.

#### 6. Remove the Old Belt
– **Take Off the Belt**: Once the tension is released, carefully slide the belt off the pulleys, starting from the tensioner side. Remove it completely from the engine bay.

#### 7. Inspect Other Components
– **Check Pulleys and Tensioner**: While the belt is off, inspect the idler pulley and tensioner for any signs of wear or damage. Spin the pulleys to ensure they rotate freely without any grinding noise. replace any faulty components if necessary.

#### 8. Install the New Belt
– **Position the New Belt**: Following the routing diagram or your earlier photo, place the new serpentine belt onto the pulleys. Start with the pulleys that are easiest to access and work your way around.
– **Adjust the Tensioner**: Use the tensioner tool again to relieve tension, allowing you to slip the belt over the tensioner pulley last.

#### 9. Final Checks
– **Ensure Proper Alignment**: Make sure the belt is seated properly on all pulleys and there are no twists in the belt.
– **Reconnect the Battery**: Once everything is in place, reconnect the negative terminal of the battery.

#### 10. Test the Installation
– **Start the Engine**: Start the engine and observe the serpentine belt in operation. Listen for any unusual noises and check to see if the belt is tracking properly on all pulleys.

#### 11. Clean Up
– **Dispose of the Old Belt**: Dispose of the old serpentine belt responsibly. Clean up your work area and put away all tools.

### Conclusion
Replacing the serpentine belt on an Aston Martin DB9 is a straightforward process if you follow these steps carefully. Make sure to take your time and ensure everything is correctly reassembled to avoid any issues while driving. If you are unsure or uncomfortable with any part of the process, it’s advisable to seek professional assistance.
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