Toyota 5.7L 3UR-FE Valley Plate Coolant Leak Repair Kit | J2Hundy Valley Guard

Designed for Toyota 5.7L 3UR-FE valley plate coolant leaks.
Includes the J2Hundy Valley Guard gasket, 2 genuine Toyota intake gaskets, and 2 genuine Toyota water pipe O-rings.
 Precision-cut, coolant-resistant gasket
 Genuine Toyota supporting seals
 Detailed installation guide shipped with each kit

The gasket solution for a repair you don't want to do twice.

Dealing with a coolant leak beneath the intake manifold on your Toyota 5.7L V8?

The 3UR-FE engine valley heat exchanger cover, commonly called the valley plate, is a known source of coolant leaks in Toyota Tundra, Sequoia, Land Cruiser, and Lexus LX570 engines.

Reaching it requires significant disassembly. And once you've invested the time or paid the labor to get there, the quality of the repair matters.

That's why we created the J2Hundy Valley Guard Complete Service Kit.

Instead of relying exclusively on the factory-style liquid sealant approach, our kit combines a purpose-built Valley Guard gasket with genuine Toyota intake manifold gaskets and water pipe O-rings.

One kit. The critical sealing components. A smarter approach to your engine valley repair.

What's Included in Your Valley Guard Kit?

Everything listed below is included:

• (1) J2Hundy 3UR-FE Valley Guard Gasket — Our precision-cut, coolant-resistant gasket designed specifically for the 5.7L valley heat exchanger cover.

• (2) Genuine Toyota OEM Intake Manifold Gaskets — Fresh factory gaskets for proper intake manifold reassembly.

• (2) Genuine Toyota OEM Water Pipe O-Rings — New factory seals for the coolant transfer pipe connections.

No guesswork. No reused water pipe O-rings. No separate orders for these critical components.

Permatex High Temp Gray RTV is required for installation and is sold separately.

Why Choose J2Hundy Valley Guard Instead of RTV Alone?

The factory approach: Toyota's original valley heat exchanger cover uses formed-in-place liquid gasket material to seal the cover to the engine.

Over time, the sealing interface can deteriorate, allowing coolant to escape into the engine valley.

The J2Hundy approach: Valley Guard introduces a precision-cut, dedicated gasket material between the mating surfaces, installed with a controlled, thin application of Permatex High Temp Gray RTV.

Rather than relying on liquid sealant alone, our solution combines a physical gasket with RTV to seal the joint.

What Makes Valley Guard Different?

• Purpose-built fitment: Designed specifically for the Toyota 5.7L 3UR-FE valley heat exchanger cover.

• Coolant-resistant construction: High-performance gasket material selected for exposure to engine coolant.

• Ultra-thin profile: 1/64-inch gasket thickness to accommodate the sealing interface.

• High-temperature material: Constructed for demanding automotive environments and repeated thermal cycling.

• Installation guidance: Detailed J2Hundy instructions explain surface preparation, gasket positioning, RTV application, and pressure testing.

Valley Guard is an aftermarket sealing solution for owners and mechanics who want an alternative to a liquid-sealant-only repair.

Engineered for the Demands of Your Toyota V8

We didn't choose generic gasket material.

Our Valley Guard gasket is manufactured using a premium aramid and inorganic fiber material with a nitrile rubber binder, selected for chemical resistance and thermal performance.

Technical Specifications

Specification	Valley Guard Gasket
Engine	Toyota 5.7L 3UR-FE V8
Application	Engine valley heat exchanger cover
Material	Aramid and inorganic fiber with NBR binder
Thickness	1/64 inch
Published material temperature rating	Up to 548°F (287°C)
Published material pressure rating	Up to 1,500 psi
Installation sealant	Permatex High Temp Gray RTV

Temperature and pressure values are gasket material ratings, not operating limits or guaranteed installed-joint performance.

Vehicle Fitment — Toyota & Lexus 5.7L 3UR-FE

The J2Hundy 5.7L Valley Guard Kit is designed for vehicles equipped with the 3UR-FE V8 engine, including:

• Toyota Tundra — 5.7L V8

• Toyota Sequoia — 5.7L V8

• Toyota Land Cruiser 200 Series — 5.7L V8

• Lexus LX570 — 5.7L V8

Important: Confirm your engine is the 5.7L 3UR-FE before ordering. This kit is not interchangeable with our 4.6L 1UR-FE products.

Complete Kit or Gasket Only — Which Should You Buy?

Choose the Complete Service Kit if:

• You're repairing an existing valley plate coolant leak.

• You're removing the intake manifold and want new OEM supporting seals.

• You don't already have replacement intake gaskets and water pipe O-rings.

• You want the required sealing components organized into one convenient purchase.

Choose the Individual Valley Guard Gasket if:

• You already purchased the correct OEM supporting seals.

• You're a repair shop sourcing your own Toyota components.

• You only need the Valley Guard gasket itself.

Both options feature the same J2Hundy Valley Guard gasket.

Installation Information

Designed for knowledgeable DIY mechanics and professional technicians.

Correct preparation and installation are essential.

• Thoroughly remove old sealant and contamination from the mating surfaces.

• Dry-fit and align the Valley Guard gasket before applying sealant.

• Use a thin, controlled application of Permatex High Temp Gray RTV following the J2Hundy instructions.

• Install new water pipe O-rings and intake manifold gaskets.

• Follow applicable Toyota torque specifications and sealant curing requirements.

• Pressure-test the cooling system according to the applicable service procedure before completing reassembly.

Installation instructions: J2Hundy Valley Guard Technical Library

RTV is not included in this kit. This kit contains the listed sealing components and is not a complete engine cooling-system repair package. Confirm the leak source before beginning repairs.

Frequently Asked Questions

Will this kit fix my Toyota 5.7L coolant leak?

If the leak is coming from the valley heat exchanger cover sealing interface, Valley Guard is designed to address that joint. Coolant leaks can originate elsewhere, so proper diagnosis is important before disassembly.

Does Valley Guard completely replace RTV?

No. Our installation method uses the Valley Guard gasket together with a thin application of Permatex High Temp Gray RTV.

Are the included Toyota gaskets and O-rings genuine OEM parts?

Yes. The two intake manifold gaskets and two water pipe O-rings are genuine Toyota components. The Valley Guard gasket itself is a J2Hundy aftermarket product.

Can I install this myself?

Experienced DIY mechanics can undertake this repair with the proper tools, service information, and sufficient time. The job requires intake removal, careful cleaning, and attention to installation details.

How quickly will my order ship?

Complete kits contain genuine Toyota components that may need to be sourced locally. Depending on parts availability, shipment may occasionally be delayed by approximately one week. Please plan accordingly.

Built for People Who Take Their Repairs Seriously

At J2Hundy Outfitters, we believe mechanical solutions should make sense in the real world—not just on paper.

Valley Guard was developed around a straightforward idea: when a repair requires substantial disassembly, the sealing materials and installation method deserve just as much attention as the labor.

Whether you're maintaining your own Land Cruiser, repairing a customer's Tundra, or keeping a high-mileage Lexus on the road, Valley Guard offers a purpose-built option for the 3UR-FE engine valley.

J2Hundy Valley Guard. Protect the work. Seal the valley. Get back on the road.