AISIN Engine Timing Belt Kit TKT-021 with Water Pump — Complete OEM-Style Kit for Lexus & Toyota

AISIN TKT-021 is a complete OEM-style timing belt service kit that includes a diecast water pump, timing belt, tensioner, pulleys, gaskets and seals ready for direct installation.

This all-in-one kit gathers the parts you should replace together when servicing the timing system and coolant pump. By bundling OE-matched components from AISIN and other original-equipment suppliers, the kit eliminates parts guessing, reduces repeat labor, and restores factory-spec fit and function for many Lexus and Toyota engines. It’s ideal when the timing belt interval arrives or when you’re already removing front covers to access the timing components.

Which components are included and why does that matter?

The kit contains the water pump, timing belt, belt tensioner, idler pulleys, gasket(s), seals, and printed installation guidance. Replacing these items together prevents premature failure caused by an older component stressing freshly installed parts.

• Water pump with diecast aluminum housing and carbon ceramic seal for durability.
• OE-quality timing belt matched to factory tooth profile and material.
• Tensioner and idler pulleys engineered to original specifications for proper belt tension.
• Gaskets and seals to ensure leak-free installation and correct clearances.

How does this kit save time and money during service?

Because the water pump and timing components share the same labor access, replacing them together avoids repeating the same disassembly twice. That reduces total shop hours and lowers the risk of follow-up repairs due to mismatched or worn ancillary parts.

• Single labor operation for belt and pump replacement cuts total service hours.
• OE-matched pieces reduce likelihood of premature wear or misfit issues.
• Inclusive gaskets and seals prevent extra parts orders and delays.

Which vehicles and engines is the TKT-021 compatible with?

TKT-021 fits a range of Lexus and Toyota models produced in the late 1990s through the 2000s; fitment depends on engine variant and model year. Always confirm fitment with the vehicle’s VIN or the seller’s fitment checker to ensure correct engine compatibility.

• Lexus examples: GS400, GS430, GX470, LS400, LS430, LX470, SC400, SC430 (select years).
• Toyota examples: 4Runner (2003–2009), Land Cruiser (1998–2007), Sequoia (2001–2009), Tundra (2000–2009).
• Note: engine code and year affect compatibility — verify before ordering.

What quality and reliability features does the AISIN kit offer?

AISIN supplies OE-grade water pumps and partners with established manufacturers for belts and bearings, delivering parts built to factory tolerances. The pump’s advanced seal materials and diecast housing improve longevity compared with low-cost aftermarket alternatives.

• OE-matched parts from AISIN, Mitsuboshi, Toyo, NTN and other trusted suppliers.
• Carbon ceramic sealing surfaces in the pump for improved wear resistance.
• Engineered pulleys and tensioner to maintain correct belt tracking and tension.

Who is this for: The AISIN TKT-021 timing belt kit is aimed at DIY mechanics, independent shops, and fleet technicians servicing supported Lexus and Toyota models who want OEM-quality replacement parts in a single package. It’s the practical choice when timing belt service, pump replacement, or preventive maintenance is needed and you want factory-matching components to minimize callbacks and ensure proper fit.