Parts for your 2010 Honda Stream-Drive belt tensioner

2010 Honda Stream drive-belt tensioner — what it does and when to replace it

Per Honda technical sources, the 2010 Honda Stream (RN6–RN9) uses an automatic drive-belt tensioner. Honda service information for the R18A (1.8-litre) and R20A (2.0-litre) engines specifies an “auto-tensioner, drive belt” in the accessory drive system, and the Honda Electronic Parts Catalogue lists this component for the Stream with typical part numbers such as 31170-RNA-A01 (R18A) and 31170-R44-A01 (R20A), varying by VIN and market. That means the tensioner is absolutely relevant to servicing on this model.

On the Stream, the drive-belt tensioner keeps the serpentine belt snug across the alternator, A/C compressor and other pulleys. It’s spring-loaded, so it automatically maintains the right tension as the belt wears and loads change (like when the air-con kicks in). No manual adjustment is needed, when the tensioner gets tired, it’s replaced as a unit.

Owners will appreciate that a healthy tensioner prevents belt slip, noise and charging issues. If the belt squeals on cold start, chirps when turning the wheel or when the A/C engages, or if there’s a fluttering belt under the bonnet, the tensioner may be past its best. Visual checks also help: look for a cracked or glazed belt, wobbling pulley, or a tensioner indicator that’s out of its normal range.

As part of routine servicing in Australia and New Zealand, it’s smart to inspect the belt and tensioner every 15,000–20,000 kilometres or 12 months. In many cases the belt will last 80,000–120,000 kilometres, but climate, city driving and accessory load can shorten that. Replace the tensioner if there’s roughness, play, noisy bearings, oil contamination, or if the belt can’t maintain proper tension.

Replacement is straightforward for a skilled DIYer or workshop: note the belt routing, use the tensioner’s hex or square drive to unload the belt, slip the old belt off, spin-check pulleys, and fit the new belt before releasing the tensioner smoothly. If the tensioner shows any binding or the pulley’s rough, fit a new unit at the same time. A fresh tensioner and belt combo saves hassles and protects the alternator and A/C from shock loads.

• Watch for squeals, chirps, or flickering charge light.
• Inspect every service, replace belt/tensioner when worn.
• Always route the belt per the under-bonnet diagram and release the tensioner slowly.

Popular questions

How can someone tell if the 2010 Honda Stream’s drive-belt tensioner is failing?

Common clues include a squeal on start-up, a chirp when the A/C engages, or a belt that flutters at idle. Under the bonnet, a wobbly tensioner pulley, rough bearing feel when spun by hand (engine off), or an indicator that’s outside its marks also point to a worn unit. If the belt keeps glazing or slipping despite being new, the tensioner is a prime suspect.

Should the belt and tensioner be replaced together?

Often, yes. If the tensioner has any play, noise or weak spring action, pairing a new belt with a fresh tensioner avoids repeat labour and early belt wear. If the tensioner checks out perfectly and the belt alone is cracked or noisy, the belt can be changed on its own—just re-check tensioner operation after fitting.

Is the timing system related to the drive-belt tensioner on the Stream?

No. The R-series engines in the 2010 Stream use a timing chain for cam drive. The drive-belt tensioner only manages the external accessory (serpentine) belt for the alternator, A/C and other ancillaries. They’re separate systems with different maintenance needs.