2023 Mercedes-Benz Metris Serpentine Belt: Routing, Part Numbers, & Replacement Guide

Quick Answer

• Belt Length: 2100mm
• Rib Count: 6-rib
• OEM Belt Part Number: Mercedes-Benz A0029933596
• Aftermarket Cross-references:
  • Gates K060827
  • Dayco 5060827
  • Continental Elite 4060827
• Auto-Tensioner Part Number: Mercedes-Benz A6512000370
• Idler Pulley Part Number: Mercedes-Benz A6512020219

Belt Routing

The serpentine belt on your 2023 Mercedes-Benz Metris is crucial for powering various accessories like the alternator, power steering pump, and air conditioning compressor. Before attempting any work, always take a clear photograph of the existing belt routing. This will serve as an invaluable reference during reinstallation.

Here's a text-based description of the typical routing path for your Metris (note: minor variations can occur based on specific engine configurations, always refer to your vehicle's service manual for the most accurate diagram):

1. Begin at the crankshaft pulley, located at the bottom center of the engine. The belt will wrap around this pulley.
2. From the crankshaft, the belt typically goes to the A/C compressor pulley, usually situated on the lower passenger side of the engine.
3. Next, the belt will route over an idler pulley, which helps guide and maintain tension, often located above the A/C compressor or near the alternator.
4. From the idler, the belt will proceed to the alternator pulley, generally located towards the top or upper front of the engine.
5. Following the alternator, the belt will often go to the power steering pump pulley, if applicable to your configuration, usually found on the driver's side, often lower than the alternator.
6. From the power steering pump, the belt may pass around the water pump pulley, which is typically in the center or upper area of the engine.
7. Finally, the belt will wrap around the automatic tensioner pulley, which provides constant tension to the belt system. This pulley is spring-loaded and crucial for proper belt operation.

How to Replace the Serpentine Belt

Replacing the serpentine belt on your Mercedes-Benz Metris can be a DIY task for those with mechanical experience. You will need a serpentine belt tool or a 3/8" drive breaker bar to release the tensioner. Remember to work on a cool engine and take appropriate safety precautions.

1. Locate the automatic tensioner. It will have a square opening for your serpentine belt tool or breaker bar.
2. Insert the tool into the square opening of the tensioner.
3. Rotate the tensioner (usually clockwise) to relieve tension on the belt. This will allow you to remove the belt from the pulleys.
4. Carefully remove the old belt from all pulleys, paying close attention to the routing, especially if you didn't take a clear photo.
5. Inspect all pulleys for any signs of wear, damage, or excessive play. If any pulley feels loose or makes noise, it may need to be replaced.
6. Install the new belt, following the routing diagram you photographed earlier or the text-based description above. Ensure the ribbed side of the belt sits correctly in the ribbed pulleys and the smooth side rides on smooth idler pulleys.
7. Once the belt is properly routed on all pulleys except the tensioner, use your tool to again rotate the tensioner to its released position.
8. Slide the new belt onto the tensioner pulley.
9. Slowly release the tensioner, allowing it to apply proper tension to the new belt.
10. Double-check the entire belt routing to ensure it is correctly seated on all pulleys before starting the engine.

Replacement Interval

Mercedes-Benz generally recommends inspecting the serpentine belt at regular service intervals, typically every 30,000 to 50,000 miles or every 2-3 years. However, various factors can shorten its lifespan, including extreme temperatures, contamination by fluids (oil, coolant), and aggressive driving. Always refer to your owner