2007 Honda Odyssey Serpentine Belt Diagram

Replacing the Serpentine Belt on a 2007 Honda Odyssey

The serpentine belt on a 2007 Honda Odyssey routes around five accessories and an idler pulley before returning to the crankshaft. The 3.5L V6 (J35) engine uses a single long belt — there's no separate accessory belt like the older four-cylinder models. If you've been searching for a 2007 Honda Odyssey Serpentine Belt Diagram because your belt is glazed, cracked, or making a squealing noise, you're in the right place. Here's how the belt actually runs, laid out in order so you can trace it without needing a picture: Starting at the crankshaft pulley at the bottom of the engine, the belt travels up the front of the engine to the power steering pump pulley on the upper left side (driver's side when facing the engine). From there it goes down to the alternator pulley on the lower right (passenger side). The belt then loops around the A/C compressor pulley just above the alternator, back up through the tensioner pulley on the left side, over the idler pulley near the top, and finally around the water pump pulley before returning to the crankshaft. The tensioner is the spring-loaded unit that keeps everything tight — it's what you'll be compressing to install or remove the belt.

2007 Honda Odyssey Serpentine Belt Diagram

I know a lot of people print these diagrams from forums and they end up blurry or upside down. The one below is drawn to be readable at actual size. If you're doing this yourself, it helps to take a photo of the old belt routing with your phone before you remove it. Honda changed the routing slightly between model years, and the 2006 and 2008 diagrams are not interchangeable. The belt part number for the 2007 Odyssey is 38920-PND-003 (or the equivalent aftermarket PK1964). It's a 6-ply ribbed belt, 1964mm long, with 6 ribs. Don't substitute a 5-rib belt from a different year — it won't seat correctly in the pulley grooves and will fail within a few thousand miles. Routing summary:

Crankshaft Power Steering Pump Alternator A/C Compressor Tensioner Idler Water Pump back to Crankshaft That's the core of it. What most people miss when they look at a diagram for the first time is the tensioner spring orientation. The tensioner on this engine has a built-in damper, and the bolt that you use to release tension needs to be turned clockwise when viewed from the front of the engine. If you go the wrong direction, you'll just compress the spring less and not get enough slack to slip the belt over the pulley. I learned that the hard way on my first try — spent about twenty minutes wrestling with it before I realized I was backing off the tension rather than applying it. One thing worth noting that the diagrams never show clearly: the idler pulley at the top is not a tensioner. It's just a guide pulley that changes the belt angle. Some people mistake it for the tensioning unit because it sits in a similar position, but it does not move. Only the lower tensioner pulley on the driver's side moves when you apply the breaker bar.

You'll need a 14mm socket on the tensioner bolt, a 12-inch breaker bar or a long ratchet handle, and optionally a extension if the bolt is buried a bit. The entire process usually takes about 15 to 20 minutes if the belt is just being replaced as preventive maintenance. If the belt has been broken and pieces are stuck in the pulley grooves, factor in another 30 to 45 minutes of cleanup. I once found a shredded piece of belt wedged between the water pump and the alternator bracket — had to pull the upper radiator shroud off just to fish it out with a magnet. That's not in any 2007 Honda Odyssey Serpentine Belt Diagram you'll find online, but it happens more often than you'd think. The installation process: First, verify the old belt is completely off and all pulleys spin freely. Spin each pulley by hand — the water pump, alternator, power steering pump, A/C compressor, idler, and tensioner. If any of them resist or make a grinding noise, replace it before putting the new belt on. A bad water pump bearing on this engine will destroy a new belt in under 5,000 miles, and the water pump itself requires removing the belt again to access. That's a $200+ job you definitely don't want to do twice.

Thread the belt onto every pulley except the tensioner. Follow the routing exactly as described above. The belt should sit evenly in all pulley grooves. Double-check this before moving to the next step. I once had a customer who skipped this and ended up with the belt riding on the edge of the idler pulley — heard it within three blocks. Place the 14mm socket on the tensioner bolt and attach your breaker bar. Pull the tensioner clockwise to release spring pressure. While holding the tensioner in the released position, slip the belt onto the tensioner pulley. Keep the tensioner held steady for a second, then slowly let it return to its resting position. Do not let it snap back — the spring force is strong enough to pinch your fingers or bend the tensioner arm if you lose control. Once the belt is seated, rotate the engine manually two full revolutions by hand using the crankshaft bolt (19mm socket). This ensures the belt tracks correctly through all pulleys and that the tensioner self-adjusts properly. After rotating, recheck that every rib of the belt is fully seated in every pulley groove.

Start the engine and listen. A new belt may squeak for the first 30 seconds or so as the ribs bed in. That's normal. If the squeak persists beyond a minute or two, the tensioner may not be applying enough force — the internal spring can fatigue over time. The tensioner on the J35 engine typically lasts 60,000 to 90,000 miles. If your belt is original and you're at 100,000 miles, replacing the tensioner at the same time is a smart move. It's about $45 to $75 for an OEM unit, and it prevents having to tear everything apart again in a year. A few practical notes: Don't use belt dressing. It's a band-aid for a worn belt or a failing tensioner, and it makes a mess of everything it touches — rubber bits, dust, and chemicals that attract more debris. If the belt is squealing, fix the root cause. Usually that's either the belt itself or the tensioner.

Also, check the condition of all pulley surfaces while the belt is off. If any pulley has deep grooves, ridges, or shiny smooth spots, replace it. A worn pulley will chatter against the belt ribs and cause premature failure even on a brand-new belt. I've seen belts fail at 8,000 miles because someone installed a new belt over a corroded A/C compressor pulley and didn't bother checking. The torque specification for the tensioner bolt is 76 ft-lbs. You don't need to retorque it after installation — it's a structural bolt with a lock washer. Just make sure it's snug when you're done. If you drop bolts into the engine bay, use a magnet tray. The 14mm tensioner bolt is short enough that it can fall right into the alternator bracket area if you're not careful. I've had to remove the lower splash shield to retrieve one once. Took 25 minutes of work that could have been avoided with a magnetic parts tray.