Does the Lexus GX 470 have a timing belt or chain?

The Lexus GX 470, produced from 2002 to 2009, uses a timing chain-driven cam system in its V8 engine. This article explains which timing mechanism it uses and what that means for maintenance and reliability.

The GX 470 uses a timing chain rather than a timing belt for cam timing.

More detail: In this model, Toyota/Lexus equipped the 4.7-liter 2UZ-FE V8 with a timing chain driven by hydraulic tensioners and chain guides. Chains generally require less frequent replacement than belts, but they rely on tensioners and guides that can wear over time. If you hear abnormal engine noises or experience timing issues at high mileage, inspection of the chain system is warranted.

Timing system basics for the GX 470

Key facts about the GX 470's timing system and what owners should monitor:

• Engine and timing drive: 2UZ-FE 4.7L V8 with cam timing driven by a timing chain.


• Maintenance expectations: No fixed belt-change interval; inspect tensioners, guides, and the chain during high-mileage service or if you notice unusual noises.


• Common wear signs: Rattling on startup, unusual engine noise, or timing irregularities can indicate tensioner or guide wear.


• Repair considerations: If a chain, tensioner, or guides fail, replacement is labor-intensive but not typically part of routine maintenance.

Conclusion: The GX 470's timing chain design favors longevity and reduces the need for routine belt service, but proactive inspection of the timing chain system is important at high mileage.

Maintenance tips and troubleshooting

Practical guidelines for keeping the timing system in good shape and recognizing issues early:

• Scheduled inspection: At higher mileage, have the timing chain and tensioners checked during major services.


• Listen for symptoms: A metallic rattle at start-up or idle may indicate worn tensioners or guides.


• Consult the manual: Use the official service manual for torque specifications and service procedures related to the timing system.

Summary: In short, the Lexus GX 470 uses a timing chain, not a belt, to drive the camshafts in its 4.7L V8. Chain systems are designed for long life, but they still require attention to tensioners and guides as mileage increases. This means fewer belt-change visits and a maintenance focus on the chain assembly, especially beyond 100,000 miles.

How much does it cost to replace a timing belt on a 2004 Lexus GX470?

The average cost to replace the timing belt on a 2004 Lexus GX470 is approximately $1,411, but can range from around $409 to over $2,400 depending on labor rates and whether other components like the water pump are replaced. The high cost is due to the extensive labor involved, as many parts must be disassembled to access the belt. For a complete job including the water pump, parts and labor can push the price to nearly $2,000. 
Cost breakdown and factors

• Parts cost: The timing belt itself is inexpensive, but other parts like the water pump, tensioners, and idlers are often replaced at the same time to avoid repeating the labor-intensive process later. 
• Labor cost: Labor is the biggest factor. The job requires several hours of work, and hourly rates vary between shops. 
• Price variations:
  • Some sources estimate a range as low as $409 to $919. 
  • Other estimates for the 2004 model are around $1,411. 
  • A full timing belt, water pump, and seal replacement job can cost up to $1,964.93 at a Toyota dealership. 
  • Some quotes for a timing belt and water pump job are around $1,210 at a Lexus dealer. 

What to do to get a better price

• Get multiple quotes: Shopping around at different shops, including independent mechanics and dealerships, is the best way to find a competitive price. 
• Ask about packages: Inquire about a comprehensive kit that includes the timing belt, water pump, and other seals to save on labor if they fail in the future. 
• Negotiate: Be prepared to negotiate, especially if you find lower quotes elsewhere. 

What year to avoid Lexus GX470?

The 2003 Lexus GX470 is often cited as the worst model year due to drivetrain issues like clunking noises, and the 2006 model also received a high number of complaints, particularly for drivetrain problems. Other years to be cautious about include models with the optional KDSS system for off-road enthusiasts due to potential costs, and early models (2004 and 2005) for dashboard cracks, dry-rotted wheels, and less engine power compared to later models. 
You can watch this video to learn about common problems to look for when buying a Lexus GX470: 52sRob DrivesYouTube · Feb 11, 2021
Specific model years to be cautious about

• 2003 Lexus GX470: Considered the worst model year by some sources due to specific drivetrain issues, such as clunking and squealing noises, and higher repair costs. 
• 2006 Lexus GX470: Received a high number of owner complaints, particularly regarding drivetrain problems. 
• Models with KDSS: If you plan to heavily modify the vehicle for off-roading, models with the Kinetic Dynamic Suspension System (KDSS) may be best to avoid due to potential complexity and cost of repairs or modifications. 

Common issues across the GX470 lifespan

• Drivetrain issues: Reports of clunking and squealing noises have been associated with certain model years. 
• Dashboard cracks: A common and potentially expensive issue across many model years, especially in warmer climates. 
• Timing belt and water pump: A crucial maintenance item. The timing belt should be replaced around every 90,000 miles, or the vehicle should have a documented history of this replacement. 
• Navigation system: The built-in navigation system is outdated and can be difficult to upgrade or repair. Many owners recommend using a smartphone for navigation instead. 
• Suspension and transmission: During a test drive, listen for unusual noises from the suspension and check for smooth transmission shifts, as these can indicate wear. 

This video discusses the maintenance of a Lexus GX470, including the timing belt replacement: 58sCar WizardYouTube · Feb 22, 2022

Does the Lexus GX have a timing chain?

This Fits Your Lexus GX 460. Your engine's timing chain can stretch over time resulting in a check engine light that comes along with excessive noise from your engine's timing cover. If the chain has broken, which is a rare occurrence, the engine will not start.

Does a Lexus GX470 have a timing belt or chain?

A Lexus GX470 has a timing belt, not a chain. This belt needs to be replaced periodically, typically around every 90,000 miles or 8 years, and failure can cause catastrophic engine damage because it is an interference engine.
 

• Timing belt: The GX470 uses a timing belt for its 4.7L V8 engine. 
• Replacement interval: The belt should be replaced approximately every 90,000 miles or 8 years, whichever comes first. 
• Interference engine: The engine is an interference type, meaning if the timing belt breaks, the pistons will collide with the valves, leading to severe internal damage. 
• Next model: The newer GX460 model, which uses a 4.6L V8, has a timing chain instead.