2024 Mercedes-Benz Sprinter Serpentine Belt Routing & Length

As an ASE-certified master technician, I’ve worked on countless Mercedes-Benz commercial vans. The 2024 Mercedes-Benz Sprinter, primarily powered by the robust OM654 2.0L 4-cylinder turbo-diesel engine, relies on a heavy-duty serpentine belt system to run its vital accessories. A broken belt on a Sprinter doesn't just mean a loss of power steering or air conditioning—it will quickly stop the water pump and alternator, leaving you stranded and risking severe engine damage.

Below is your comprehensive guide to part numbers, routing, and replacement procedures for the 2024 Mercedes-Benz Sprinter serpentine belt.

Quick Answer

Here are the essential specifications and part numbers for the 2024 Sprinter (2.0L OM654 Diesel). Always verify exact fitment with your VIN, as High Output (HO) and Standard Output (SO) variants, or auxiliary A/C options, may alter belt length.

• Rib Count: 6-rib (6PK)
• Belt Length: ~2040 mm (Approx. 80.3 inches)
• OEM Belt Part Number: A 654 993 00 96
• Aftermarket Cross-References:
  • Gates K060803 (or 6PK2040 equivalent)
  • Continental Elite 4060805
  • Dayco 5060805
• Auto-Tensioner Assembly OEM: A 654 200 19 00
• Idler Pulley OEM: A 654 200 20 00

Belt Routing

Because the engine bay of the Sprinter is tightly packaged, navigating the belt path can be confusing once the old belt is off. Pro Tip: Always photograph the existing belt in place before removing it, especially if you have an auxiliary A/C compressor for the cargo area.

For the standard OM654 2.0L diesel layout, the ribbed side of the belt will contact the grooved pulleys, while the smooth side rides against the idler and tensioner. Here is the typical step-by-step routing path:

1. Start by looping the belt down around the Crankshaft Pulley (bottom center).
2. Route it up and to the left (passenger side) around the A/C Compressor.
3. Bring the smooth side of the belt over the Upper Idler Pulley.
4. Route the ribbed side around the Alternator (top right/driver side).
5. Bring it down and wrap it around the Water Pump pulley.
6. Finally, slip the smooth back of the belt under the Auto-Tensioner Pulley (you will do this step last while holding the tensioner open with your tool).

Note: Models equipped with electric power steering do not have a traditional engine-driven power steering pump pulley.

How to Replace the Serpentine Belt

Replacing the belt on a 2024 Sprinter requires patience due to the limited clearance between the front of the engine and the cooling fan/radiator assembly.

Tools Needed:

• Serpentine belt tool or long-handled 3/8" drive breaker bar / long wrench.
• Appropriate E-Torx or metric socket for the tensioner lug.
• Flashlight and safety glasses.

Procedure:

1. Locate the tensioner: Find the spring-loaded automatic tensioner assembly located on the front of the engine block.
2. Relieve tension: Fit your breaker bar or serpentine belt tool onto the tensioner pulley bolt or dedicated casting lug. Rotate the tensioner counter-clockwise (away from the belt) to relieve tension.
3. Remove the old belt: While holding the tensioner open, slip the belt off the easiest accessible pulley (usually the alternator or the tensioner itself). Slowly release the tensioner—do not let it snap back.
4. Inspect pulleys: Spin the idler pulleys, water pump, alternator, and A/C compressor by hand. They should spin smoothly with no wobble, grinding, or squeaking. If the tensioner bounces or feels gritty, replace the entire tensioner assembly now.
5. Install the new belt: Route the new belt following the path described above.
6. Apply tension: Compress the tensioner again, slip the final loop of the belt over the tensioner pulley, and gently release the tensioner. Double-check that all ribs are perfectly seated in the pulley grooves before starting the engine.

Replacement Interval

Mercedes-Benz recommends inspecting the serpentine belt every 20,000 miles (Service A/B intervals). For commercial vans seeing heavy use, idling, and high mileage, I recommend replacing the serpentine belt and inspecting the tensioner every 60,000 to 80,000 miles. Preventative maintenance is far cheaper than a breakdown under a heavy load.

Signs of a Failing Belt or Tensioner

Don't wait for a snap. Look out for these warning signs:

• Squealing or Chirping: Especially prominent on cold starts or when the A/C engages. This usually indicates belt glazing or a weak tensioner spring.
• Visible Wear: Look for missing ribs, deep cracking (more than 3 cracks per inch), fraying edges, or chunking on the ribbed side of the belt.
• Tensioner Bounce: While the engine is idling, watch the tensioner. If it is vibrating violently or bouncing, the internal dampener has failed.
• Battery or Temperature Warnings: If the belt slips badly, the alternator won't charge properly, and the water pump won't circulate coolant, leading to dashboard warning lights.

Keep your commercial fleet moving. If you lack the tools or time to tackle this job yourself, find a trusted shop on Repairius.