2016 Subaru Outback Serpentine Belt: Routing, Replacement, and Part Numbers

Quick Answer

For your 2016 Subaru Outback, the serpentine belt system is critical for operating accessories like the alternator, power steering, and air conditioning. Here are the essential details:

• Belt Length & Rib Count: The 2016 Subaru Outback with the 2.5L H4 engine typically uses a 6-rib belt, approximately 94.5 inches (2400mm) in effective length. Models with the 3.6L H6 engine will use a different belt.
• OEM Belt PN (2.5L H4): 809221290
• Aftermarket Cross-references (2.5L H4):
  • Gates K060945 (check for exact fitment, as lengths can vary slightly by manufacturer)
  • Dayco 5060945
  • Continental Elite 4060945
• Auto-Tensioner PN (2.5L H4): 23769AA010
• Idler Pulley PN (2.5L H4): 23770AA020

Always verify part numbers with your VIN for exact fitment as variations can occur, especially between 2.5L H4 and 3.6L H6 engine options.

Belt Routing (2.5L H4 Engine)

Before you begin any work, take a clear photo of your existing belt routing! This will be your best guide for reinstallation. The 2016 Subaru Outback 2.5L H4 serpentine belt typically routes as follows:

1. Starting from the crankshaft pulley (the largest pulley at the bottom center of the engine), the belt wraps around the bottom.
2. From the crankshaft, the belt goes up and to the left to the A/C compressor pulley.
3. From the A/C compressor, the belt continues up to an idler pulley (a smooth, flat pulley that guides the belt).
4. After the idler pulley, the belt goes across to the alternator pulley (often the highest pulley on the passenger side).
5. From the alternator, the belt moves down to the power steering pump pulley.
6. From the power steering pump, the belt continues to the water pump pulley.
7. Finally, the belt wraps around the auto-tensioner pulley, which provides the necessary tension to keep the belt snug.

Remember, this is a general guide. Your photograph will be invaluable.

How to Replace the Serpentine Belt

Replacing the serpentine belt on your 2016 Subaru Outback 2.5L H4 is a manageable DIY task for those with some mechanical experience.

1. Safety First: Ensure the engine is cool and disconnect the negative terminal of your battery.
2. Locate the Tensioner: Identify the automatic belt tensioner. It will have a square drive hole (typically 3/8-inch or 1/2-inch).
3. Release Tension: Insert a serpentine belt tool or a breaker bar with the appropriate square drive into the tensioner