Parts for your 2004 Toyota Highlander-Timing belt kit

2004 Toyota Highlander timing-belt-kit: does this model use one?

Based on Toyota service information and widely cited catalogues from Aisin, Gates and Dayco, the 2004 Toyota Highlander (also known as Kluger in some markets) was offered with two engines: the 2.4‑litre 2AZ‑FE four‑cylinder and the 3.3‑litre 3MZ‑FE V6. Technical references note that the 2AZ‑FE uses a timing chain (no belt), while the 3MZ‑FE uses a conventional timing belt. That means a timing-belt-kit is not relevant to the 2.4‑litre version, but is absolutely applicable to the 3.3‑litre V6. Owners can confirm fitment via the engine code on the build plate or by VIN lookup against Toyota’s maintenance schedules and the above aftermarket application guides.

For the 3.3‑litre V6 Highlander where a belt is fitted, a timing-belt-kit keeps the camshafts and crankshaft perfectly in step so the engine runs smoothly and efficiently. A proper kit typically bundles the toothed belt, hydraulic or mechanical tensioner, idler pulleys, and often the water pump and front oil seals. Replacing these as a set prevents old components from stressing a new belt and saves labour under the bonnet later.

Service guidance commonly quoted for the 3MZ‑FE V6 from Toyota maintenance literature and major aftermarket catalogues recommends timing belt replacement around 150,000 kilometres (about 90,000 miles) or 7–9 years, whichever comes first. Age hardens rubber even if kilometres are low. Many workshops also advise renewing the water pump, thermostat, accessory drive belt and coolant at the same time, as access is the same and it’s cost‑effective.

Typical signs that the V6’s timing system needs attention include belt glazing or cracking, chirps or whirrs from idler bearings, coolant traces at the water pump weep hole, or oil mist inside the timing cover from tired cam/crank seals. Leaving it too long risks a sudden no‑start, poor running, or collateral damage from failed tensioners or a seized pump.

What’s in a quality timing-belt-kit for the V6 Highlander:

• Timing belt (correct tooth profile and length)
• Tensioner assembly and idler pulleys
• Water pump with gasket or sealant
• Camshaft and crankshaft oil seals (often included)

Workshop tips technicians swear by:

1. Verify engine code (3MZ‑FE) before ordering parts, the 2AZ‑FE four‑cylinder uses a chain and does not need a belt kit.
2. Align timing marks meticulously, rotate the engine by hand two full turns, and re‑check marks before reassembly.
3. Use fresh Toyota‑approved coolant and torque fasteners to spec, don’t reuse stretched hardware.

For the 2.4‑litre chain‑driven Highlander, a timing-belt-kit isn’t used because the engine relies on a metal timing chain with hydraulic tensioning bathed in engine oil. Routine oil changes with the correct grade are the key maintenance item for chain longevity, there’s no scheduled belt replacement on that variant.

Popular questions about the 2004 Toyota Highlander timing-belt-kit

Does a 2004 Toyota Highlander have a timing belt or chain?
Technical sources list two engines for 2004. The 2.4‑litre 2AZ‑FE has a timing chain (no belt to replace). The 3.3‑litre 3MZ‑FE V6 uses a timing belt, so a timing-belt-kit applies to that model.

When should the timing belt be replaced on the 2004 Highlander V6?
Major service guides and Toyota maintenance information commonly recommend about 150,000 km or 7–9 years for the 3MZ‑FE V6, whichever comes first. High‑heat, towing, or short‑trip use can justify earlier inspection and replacement.

Should the water pump be changed with the belt?
Yes, most technicians fit a complete kit including the water pump, tensioner and idlers during the belt service. Access overlaps, so doing it together saves labour and helps the new belt run on fresh, reliable components.