Timing Belt Idler Pulley - Honda Acty Truck HA3, HA4 Models - 1990-1999

This timing belt idler pulley fits the Honda Acty Truck HA3, HA4 (1990-1999). It guides the timing belt and keeps it tracking true.

Vehicle Fitment & Compatibility

Confirm your chassis code against the table below before ordering.

Signs you need this timing belt idler pulley

• A whir or rumble from the timing cover
• Rough or notchy feel when you spin the pulley
• You are already doing the timing belt
• A seized or noisy old pulley

Features & Function

• Guides the timing belt
• Smooth bearing for quiet running
• Correct fit for the Acty timing system

Installation Specifications

• Difficulty: Advanced.
• Estimated time: about 2 to 4 hours with the belt.
• Required tools: A socket set and belt-timing tools.

Frequently Asked Questions

How do I test the timing belt idler pulley?

With the belt off, spin the pulley by hand. Any roughness, notchiness, or noise means the bearing is worn - a whir from the timing area with the engine running is the audible sign.

What happens if the idler pulley seizes?

A dry idler bearing gets noisy, then lets the timing belt wander or shred and strand the truck - which is why it goes in fresh with every belt change.

Does the idler pulley set the belt tension?

No - the tensioner sets the tension; the idler just guides and backs the belt. Both wear, so they go in together during a belt job.

Fitment verified by the Kei truck specialists at Oiwa Garage · Listing updated June 2026.