AISIN Engine Timing Belt Kit TKT-025 with Water Pump — OE-quality kit for Toyota 4Runner, Tacoma, Tundra

A complete AISIN TKT-025 timing belt service kit pairs an OE-matched water pump with a timing belt, tensioner, pulleys, gaskets and instructions for select Toyota 4Runner, T100, Tacoma and Tundra engines.

This all-in-one kit bundles the parts you should replace together whenever the timing belt is serviced. AISIN supplies original-equipment quality components—including a diecast aluminum water pump with carbon ceramic seals and factory-grade belts and bearings—so you can restore proper timing-system function without hunting down individual parts. The kit was assembled to match factory specifications for the compatible Toyota models and engines listed, and it arrives boxed with installation guidance to streamline the job.

Why replace the water pump and timing belt at the same time?

Labor overlap makes it cost-effective to change both the timing belt and water pump together. Removing covers and disassembling engine accessories to access the belt is the most time-consuming part; the water pump sits behind many of the same components, so replacing them together avoids repeating that work later.

• Saves labor cost by combining two procedures into one service event
• Prevents premature failure of a new belt due to an old pump bearing
• Minimizes future downtime and repeated tear-downs

What components come in the AISIN TKT-025 kit and how do they match OE quality?

The kit contains an AISIN water pump plus a timing belt, tensioner, pulleys, gaskets and installation instructions. Each piece is selected to match original equipment dimensions and tolerances, using well-known manufacturers and OE-level materials for long-term reliability.

• AISIN diecast aluminum water pump with carbon ceramic sealing for improved durability
• Factory-spec timing belt (Mitsuboshi/Toyo-grade materials) for correct tooth profile
• Tensioner and pulleys with NTN-grade bearings to maintain precise belt tension

How do I confirm fitment for my Toyota model and engine?

Fitment depends on both vehicle model year and specific engine variant. Use the SKU and vehicle fit checker on the retailer page or cross-reference your VIN to ensure this kit matches your engine family and production year range.

• Compatible model years: Toyota 4Runner (1996–2002), T100 (1995–1998), Tacoma (1995–2004), Tundra (2000–2004)
• Verify engine code against the fitment tool or your service manual
• Contact seller with VIN if you need confirmation before purchase

What should I expect during installation and maintenance after replacement?

Installation follows standard timing belt replacement steps and the kit includes instructions to guide experienced DIYers or professional technicians. After installation, follow routine cooling-system checks and inspect belt tension/condition at scheduled intervals to maintain performance.

• Follow timing marks and torque specs from the instruction sheet or factory manual
• Bleed the cooling system and check for leaks after pump installation
• Inspect belt alignment and pulley bearings after initial road test

Who is this kit designed for? The AISIN TKT-025 kit is aimed at Toyota owners, independent garages and professional technicians who want an OE-quality replacement package for timing-belt service on compatible 4Runner, T100, Tacoma and Tundra models. It’s ideal for anyone planning a timing belt job who prefers the convenience of a single, matched set of parts to reduce installation time and avoid mismatched components. If you maintain or restore older Toyota trucks and SUVs and want parts that meet factory specifications, this kit supplies the majority of components needed for a dependable timing-system refresh.