Drive Belt Tensioner Assembly for 2008-2010 Honda Accord, 2005-2010 Odyssey & 2006-2011 Pilot

A Drive Belt Tensioner for the Accord, Odyssey, and Pilot

This is a drive belt tensioner assembly built for the 2008-2010 Honda Accord, 2005-2010 Honda Odyssey, and 2006-2011 Honda Pilot, cross-referenced to OE number 31170-R70-A01. If you're hearing a squealing or chirping noise from the front of the engine, especially on startup or during acceleration, a worn drive belt tensioner is a common cause on these Honda models.

Why This Tensioner Spans a Sedan, a Minivan, and an SUV

The Accord, Odyssey, and Pilot from this era share Honda's V6 engine architecture across their lineup, and the accessory drive system that runs the alternator, power steering pump, and air conditioning compressor off the same belt was engineered consistently across these platforms. Because the tensioner's job is mechanical rather than model-specific, keeping the belt at correct tension regardless of vehicle body style, the same tensioner assembly covers a family sedan, a minivan, and a three-row SUV that otherwise have little in common from a driver's seat.

Key Features

• Cross-referenced to OE number 31170-R70-A01 and interchange numbers 89390FN, 49439, 305390
• Direct-fit replacement, no modifications required
• Durable construction built to withstand daily driving conditions
• Backed by a 1-year manufacturer warranty

Specifications

• Type: Drive belt tensioner assembly
• OE part number: 31170-R70-A01
• Fitment type: Direct replacement
• Warranty: 1 year
• Condition: New

Compatibility

Fits the 2008-2010 Honda Accord, 2005-2010 Honda Odyssey, and 2006-2011 Honda Pilot. Because these models were offered with more than one engine option across these years, it's worth confirming your specific vehicle's engine against the OE number above before ordering, or contacting us with your VIN if you're unsure.

Signs Your Belt Tensioner Needs Replacing

A worn drive belt tensioner typically shows up as a squealing, chirping, or rattling noise from the front of the engine that changes with engine speed or temperature, a belt that appears to wobble or flutter rather than running flat, or a belt that repeatedly slips off its pulleys even after being correctly reinstalled. Because the tensioner keeps the belt tight as the engine heats up and cools down, a weak spring or a seized pivot bearing inside it can let the belt loosen enough to slip, which can affect the alternator, power steering, and air conditioning all at once since they typically share the same belt.

Why Replace the Complete Tensioner Assembly

The pulley bearing and spring mechanism inside this tensioner are sealed together as a single serviceable unit, which is why replacing the complete assembly is the standard repair rather than attempting to service the internal bearing or spring separately. Starting with a new assembly means the bearing, spring, and pulley are all fresh at once, avoiding the risk of a second failure shortly after a partial repair on a component under constant spring tension and rotational load.

Installation Notes

Replacing this tensioner means relieving belt tension with a breaker bar or tensioner tool, removing the serpentine belt, unbolting the old tensioner from the engine block, and installing the new unit before routing the belt back over its pulleys according to the routing diagram under the hood. Because reinstalling the belt in the wrong path can affect multiple accessories at once, double-checking the routing diagram before releasing tension back onto the belt is worth the extra minute rather than guessing at the correct path from memory.

Ordering Information

This belt tensioner is in stock and ships ready to install. Our Shipping Information page covers current timelines, and our Warranty and Returns pages explain what to do if anything isn't right on arrival. Not sure this matches your specific Honda and engine? Our Request a Part page is the fastest way to confirm before you order.

Related Parts

This belt tensioner is listed in our Honda collection, along with our Engine Parts collection, where you'll find other parts for the Accord, Odyssey, and Pilot.