2022 Subaru Forester Serpentine Belt Routing & Replacement Guide

Quick Answer

• Belt Length: Approximately 90.5 inches (2299 mm)
• Rib Count: 6-rib
• OEM Belt Part Number: 809221140 (Subaru)
• Aftermarket Cross-References:
  • Gates K060905
  • Dayco 5060905
  • Continental Elite 4060905
• Auto-Tensioner Part Number: 23769AA00A (Subaru)
• Idler Pulley Part Number: 23758AA030 (Subaru)

Belt Routing

Before you begin, it's highly recommended to take a clear photograph of your current serpentine belt routing. This will serve as an invaluable reference during reinstallation.

The serpentine belt on your 2022 Subaru Forester (non-turbo models) follows a specific path, driven by the crankshaft and powering various accessories. Here's a typical routing for the naturally aspirated engine:

1. Starting from the crankshaft pulley (the large pulley at the bottom front of the engine).
2. The belt then goes up to the A/C compressor pulley.
3. From the A/C compressor, the belt routes to the idler pulley (often a smooth pulley, guiding the belt).
4. Next, it wraps around the alternator pulley (typically located at the top of the engine, generating electrical power).
5. From the alternator, it makes its way to the power steering pump pulley (if applicable, some models have electric power steering).
6. The belt then travels down to the water pump pulley (circulating coolant through the engine).
7. Finally, it loops around the automatic tensioner pulley, which maintains the correct tension on the belt before returning to the crankshaft pulley.

Keep in mind that slight variations can occur between specific engine options or trim levels. Always double-check your vehicle's unique routing.

How to Replace the Serpentine Belt

Replacing the serpentine belt on your 2022 Subaru Forester is a manageable DIY task for those with some mechanical experience. Here's a general overview of the process:

1. Safety First: Ensure the engine is cool and the vehicle is securely parked on a level surface. Disconnect the negative battery terminal to prevent accidental starts.
2. Locate the Tensioner: Identify the automatic serpentine belt tensioner. It will have a square opening, typically 3/8-inch, designed for a breaker bar or a serpentine belt tool.
3. Relieve Tension: Insert a 3/8-inch breaker bar or serpentine belt tool into the square opening of the tensioner. Rotate the tensioner counter-clockwise (or clockwise, depending on the tensioner's orientation) to release the tension on the belt. This will allow you to slip the belt off the pulleys.
4. Remove Old Belt: Carefully remove the old belt from all the pulleys, paying close attention to the routing, and referencing your photo.
5. Inspect Pulleys: While the belt is off, inspect all pulleys for any signs of wear, damage, or excessive play. Worn pulleys can prematurely damage a new belt.
6. Install New Belt: Route the new belt around all the pulleys according to your diagram, leaving the tensioner pulley for last. Make sure the ribs on the belt align perfectly with the grooves on the ribbed pulleys.
7. Tension the Belt: Once the belt is mostly in place, use the breaker bar or serpentine belt tool to rotate the tensioner again, creating enough slack to slip the belt over the tensioner pulley. Slowly release the tensioner, allowing it to apply proper tension to the new belt.
8. Double-Check: Visually inspect the entire belt routing to ensure it's correctly seated on all pulleys and that no part of the belt is twisted or misaligned. Reconnect the battery.
9. Start and Listen: Start the engine and listen for any unusual noises. A new belt might squeak briefly but should quiet down quickly. Check for smooth operation.

Replacement Interval

Subaru typically recommends inspecting the serpentine belt at regular service intervals, often every 30,000 miles or 30 months, and replacing it as needed. However, it's a good practice to visually inspect your belt more frequently, especially if you drive in harsh conditions. Factors such as extreme temperatures, dust, and extended idle times can accelerate wear.

Signs of a Failing Belt or Tensioner

Don't wait for your belt to break! Here are common indicators that your serpentine belt or automatic tensioner may need attention:

• Squealing or Chirping Noises: This is one of the most common signs, especially during start-up, acceleration, or when the engine is cold. It can indicate a worn or loose belt, or a failing pulley.
• Cracks, Fraying, or Glazing on the Belt: Visually inspect the belt for any signs of wear, such as cracks, chunks missing from the ribs, fraying edges, or a shiny, glazed appearance on the ribbed side. These are all signs of a worn belt.
• Loss of Power to Accessories: Since the serpentine belt drives accessories like the power steering pump, alternator, and A/C compressor, a failing belt can lead to issues with these systems. You might notice dimming headlights, a non-working A/C, or difficulty steering.
• Overheating Engine: If the belt drives the water pump, a slipped or broken belt could lead to the engine overheating due to a lack of coolant circulation.
• Wobbling Pulley or Tensioner: A failing automatic tensioner might have excessive play or wobble. You might also notice that the tensioner arm isn't holding consistent tension on the belt.
• Grinding or Growling Noises from Pulleys: This could indicate a failing bearing within one of the pulleys (idler, tensioner, or accessory pulleys).

Addressing these issues promptly can prevent more extensive and costly repairs down the line.

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