How long does a 4Runner timing belt last?
Most Toyota 4Runners built in recent years use a timing chain rather than a belt, so there isn’t a regular “belt replacement” interval to follow. Only older 4Runners equipped with the 3.4-liter 5VZ‑FE V6 used a timing belt, which typically requires replacement around 90,000 miles (about 145,000 kilometers) or per the owner’s manual. In short, check your engine year and model to know whether a belt exists at all and plan accordingly.
Timing systems by model year
Understanding which 4Runner engine you have will tell you whether you’ve got a belt or a chain, and what maintenance to expect.
- 1GR-FE 4.0L V6 (2003–present): timing chain; no scheduled belt changes; chains are designed for long life but tensioners and guides can wear over time and may require inspection or replacement during major services.
- 5VZ-FE 3.4L V6 (1998–2002, used in earlier 4Runners): timing belt; belt replacement is typically around 90,000 miles (roughly 145,000 km) or per the owner’s manual; belt failure can cause severe engine damage.
In summary, contemporary 4Runners rely on timing chains, while the belt-driven setup belongs to older 5VZ‑FE-powered models. Always verify your exact engine and consult the service manual for intervals.
What to know if your 4Runner has a 5VZ-FE engine
If your 4Runner still uses the 5VZ-FE belt, plan to replace the belt at or near the recommended interval, and consider replacing the water pump and belt tensioner at the same time to minimize labor and future downtime.
- Replace timing belt, water pump, tensioners, and idler pulleys as a kit to reduce future labor.
- Use OEM or high-quality equivalent parts and ensure proper belt routing and tension when installed.
- Have the cooling system inspected and serviced if you’re replacing the water pump to prevent overheating and premature belt wear.
Owners should also budget for a potential mechanic’s inspection of cam/crank seals and related gaskets during the belt service to prevent future leaks.
Indicators of belt wear or impending failure
Whether you have a belt-driven or chain-driven 4Runner, certain signs warrant immediate attention to avoid breakdowns.
- Visible cracks, fraying, or missing teeth on the belt (for belt-driven engines).
- Unusual engine noises, such as rhythmic ticking or whining coming from the timing area.
- Engine misfires or rough running, especially at idle or under load.
- Difficulty starting or the engine failing to start if the belt has jumped or fractured.
If you notice any of these signs, consult a mechanic promptly. For chain-driven engines, listening for unusual tensioner or chain noise during regular maintenance is key.
Maintenance takeaway
For current 4Runners, you’re unlikely to face a timing belt replacement unless you own a very early model with the 5VZ-FE engine. If you do have the belt-driven 5VZ-FE, adhere to the roughly 90,000-mile guideline and perform the belt job with ancillary components to avoid costly repairs from belt failure.
Summary
The practical answer is that most modern 4Runners don’t use a timing belt at all; they use a timing chain designed for long life. Only older 4Runners with the 5VZ-FE 3.4L V6 used a belt, which generally should be replaced around 90,000 miles. When in doubt, consult your owner’s manual or a trusted mechanic to confirm your engine type and the appropriate service interval.
