60 6.6 Duramax Serpentine Belt Diagram

2005 Duramax Serpentine Belt Diagram
2005 Duramax Serpentine Belt Diagram from wiringall.com


In this article, we will be discussing the 6.6 Duramax serpentine belt diagram. The serpentine belt is a crucial component of the engine, responsible for driving various accessories such as the alternator, power steering pump, and air conditioning compressor. Understanding the correct routing of the serpentine belt is essential for proper functioning of these accessories and overall engine performance. We will provide a step-by-step guide along with a detailed diagram to help you navigate the serpentine belt installation process.

1. Importance of the Serpentine Belt

The serpentine belt is an important part of the engine's accessory drive system. It provides power to various components, including the alternator, power steering pump, water pump, and air conditioning compressor. Without a properly functioning serpentine belt, these accessories would not be able to operate efficiently. Additionally, a worn or damaged serpentine belt can lead to engine overheating, battery drain, and loss of power steering.

1.1 Alternator

The alternator is responsible for charging the vehicle's battery and providing electrical power to the vehicle's systems. The serpentine belt drives the alternator pulley, allowing it to generate electricity and keep the battery charged. Without a properly functioning alternator, the vehicle's electrical systems may not work correctly, and the battery may drain, leaving you stranded.

1.2 Power Steering Pump

The power steering pump assists in turning the vehicle's wheels by applying hydraulic pressure to the steering system. The serpentine belt drives the power steering pump pulley, allowing it to provide the necessary pressure for easy and smooth steering. If the serpentine belt fails, you may experience difficulty in steering the vehicle, especially at lower speeds.

1.3 Water Pump

The water pump circulates coolant throughout the engine, preventing it from overheating. The serpentine belt drives the water pump pulley, ensuring a constant flow of coolant. If the serpentine belt breaks or becomes loose, the water pump will not function correctly, leading to engine overheating and potential damage.

1.4 Air Conditioning Compressor

The air conditioning compressor is responsible for compressing and circulating refrigerant to cool the vehicle's interior. The serpentine belt drives the air conditioning compressor pulley, allowing it to function correctly. If the serpentine belt is worn or damaged, the air conditioning compressor may not work efficiently, resulting in reduced cooling performance.

2. Understanding the Serpentine Belt Diagram

Before we proceed with the installation process, it is essential to understand the serpentine belt diagram. The diagram provides a visual representation of how the belt should be routed around the various pulleys. Each manufacturer may have a slightly different belt routing configuration, so it is crucial to refer to the specific diagram for your 6.6 Duramax model.

2.1 Accessing the Belt Diagram

The serpentine belt diagram can usually be found under the hood of your vehicle. It may be located on the radiator support, near the engine compartment, or on the underside of the hood itself. Look for a sticker or label that displays the belt routing diagram. If you cannot locate the diagram, consult the vehicle's owner's manual or contact the manufacturer for assistance.

2.2 Understanding the Belt Routing

The serpentine belt diagram consists of a series of pulleys and arrows indicating the direction of belt travel. The diagram may also include labels identifying each pulley's function. Carefully study the diagram to understand the correct routing of the belt and the position of each pulley. This will ensure that you install the serpentine belt correctly and avoid any potential issues.

3. Steps to Install the Serpentine Belt

Now that you have a good understanding of the serpentine belt diagram, let's proceed with the installation process. Follow these steps to install the serpentine belt correctly:

3.1 Locate the Tensioner Pulley

The tensioner pulley is responsible for keeping the serpentine belt tight. It is typically located near the center of the engine and has a smooth surface for the belt to ride on. Use a wrench or a specialized tensioner tool to rotate the tensioner pulley and relieve tension on the belt. This will allow you to remove the old belt and install the new one.

3.2 Remove the Old Belt

Once the tensioner pulley is rotated, you can easily slip the old serpentine belt off the pulleys. Take note of the belt routing and the position of each pulley as you remove the old belt. This will help you correctly install the new belt.

3.3 Install the New Belt

Refer to the serpentine belt diagram for the correct routing of the new belt. Starting from the bottom or top (depending on the routing), slowly thread the new belt around each pulley according to the diagram. Ensure that the belt is properly seated on each pulley and aligned with the grooves.

3.4 Rotate the Tensioner Pulley

Once the new belt is installed, rotate the tensioner pulley again to relieve tension. This will allow the belt to settle into its proper position and ensure that it is properly tensioned. Double-check the belt routing and make any necessary adjustments before releasing the tensioner pulley.

3.5 Inspect the Belt and Pulleys

After installing the new serpentine belt, visually inspect it for any signs of wear, fraying, or damage. Check each pulley for alignment and smooth operation. If you notice any issues, such as misalignment or unusual noise, it may indicate a problem with the belt tension or a faulty pulley. In such cases, consult a professional mechanic for further inspection and repair.

4. Maintenance Tips for Serpentine Belts

Proper maintenance of the serpentine belt is crucial for its longevity and optimal performance. Here are a few tips to help you maintain your serpentine belt:

4.1 Regular Inspections

Periodically inspect the serpentine belt for any signs of wear, cracking, or damage. Look for frayed edges, glazing, or excessive slack. If you notice any issues, it is best to replace the belt immediately to avoid further damage.

4.2 Tension Adjustment

Ensure that the serpentine belt is properly tensioned. If it is too loose, it may slip off the pulleys, leading to accessory failure. If it is too tight, it can put unnecessary strain on the belt and pulleys, causing premature wear. Refer to the vehicle's manual or consult a professional mechanic for the correct tension specifications.

4.3 Cleaning and Lubrication

Keep the serpentine belt and pulleys clean from dirt, debris, and oil. Use a clean cloth to wipe away any accumulated grime. Avoid applying any lubricants or belt dressings to the belt as they can cause slippage and shorten its lifespan.

4.4 Replacement Interval

While serpentine belts are designed to last for a long time, they will eventually wear out and require replacement. It is recommended to replace the serpentine belt every 60,000 to 100,000 miles or as specified by the vehicle manufacturer. Regularly check the owner's manual or consult a professional mechanic for the recommended replacement interval for your specific vehicle.


Understanding the 6.6 Duramax serpentine belt diagram is essential for maintaining the proper functioning of your vehicle's accessories and overall engine performance. By following the steps outlined in this article and referring to the diagram, you can confidently install a new serpentine belt or inspect the existing one. Remember to regularly inspect and maintain your serpentine belt to ensure its longevity and avoid any potential issues. If you are unsure or encounter any difficulties, it is always recommended to seek the assistance of a professional mechanic for proper diagnosis and repair.

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