The belt tensioner on a 2010 Honda Pilot is a hydraulic, spring-loaded pulley mounted on the front of the engine, on the passenger side near the crankshaft pulley. It automatically keeps tension on the serpentine belt that drives the engine’s accessories.
In the 2010 Pilot, which uses a 3.5-liter V6, the serpentine belt loops around the crank pulley and several accessory pulleys (such as the alternator, power steering pump, and air conditioning compressor). The tensioner is one of the pulleys in that path and is designed to apply consistent tension without manual adjustment.
Where it sits in the engine bay
What to look for
Look for a small round pulley mounted on a bracket that accepts a tool to release tension. The tensioner is part of the belt path and is typically located toward the front of the engine, on the passenger (right) side, near the timing cover and water pump area.
Locating the tensioner — step-by-step
Use these steps to identify the exact position of the belt tensioner by tracing the serpentine belt path.
- Open the hood and locate the serpentine belt that runs around the crank pulley at the bottom of the front of the engine and loops to the accessory pulleys.
- Follow the belt path until you find the spring-loaded pulley mounted on a small bracket—the belt tensioner. It should be one of the pulleys along the path, usually closer to the center-right of the engine bay.
- Note the tensioner’s orientation: the belt wraps around the tensioner pulley and the tensioner arm presses against the belt to maintain tension. On most Honda V6 layouts, it is on the passenger side near the water pump/timing cover area.
Conclusion: The tensioner is part of the serpentine belt system and sits on the front of the engine, on the passenger side, integrated into the belt path near the timing cover area. With the belt in view, you should be able to identify the tensioner as the spring-loaded pulley that maintains tension.
Safety and maintenance notes
Always ensure the engine is off and cool before inspecting or removing the belt. Disconnect the battery ground before performing any belt work, wear eye protection, and refer to the vehicle's service manual for the exact release direction and torque specifications if you replace the belt or tensioner.
Summary
On a 2010 Honda Pilot, the belt tensioner is a hydraulic auto-tensioner mounted on the front of the engine, on the passenger side near the crankshaft pulley. It is part of the serpentine belt system that powers accessories like the alternator, A/C compressor, and power steering pump. Locate it by tracing the belt path to identify the spring-loaded pulley, then follow proper safety steps if replacement is needed.