Toyota 1GR-FE Engine Overhaul Gasket Kit with MLS Cylinder Head Gaskets and Complete Single-Kit Solution for 24-Valve DOHC

The engine overhaul gasket kit carrying OEM number 04111-31050 is a complete sealing solution for Toyota's 1GR-FE 4.0L V6 petrol engine. It serves as a direct replacement for factory sealing components in Toyota 4Runner, Tacoma, Tundra, FJ Cruiser, Land Cruiser, Land Cruiser Prado, and Fortuner vehicles from the early 2000s through the mid‑2010s.

The 1GR-FE is a 3,956 cc DOHC V6 engine with a bore and stroke of 94.0 mm * 95.0 mm, first introduced in 2003. Depending on tuning and fuel grade, it produces between 236 and 270 hp and torque ranging from 266 to 278 lb‑ft. The engine features single VVT‑i on early versions (2003–2009) and dual VVT‑i on later builds (2010 onward), with an aluminum cylinder head and cylinder block.

By 200,000–250,000 km, the original gaskets and seals naturally age—hardening, shrinking, and losing their sealing capacity. Common indicators include oil misting around the rocker covers or timing cover, coolant seepage at hose flanges or water pump weep hole, unexplained coolant loss, pressurised cooling system hoses when cold, milky residue under the oil cap, or white exhaust smoke indicating coolant entering combustion chambers.

This Toyota 1GR-FE engine overhaul gasket kit 04111-31050 directly replaces factory sealing components in the following configurations:

Cross‑industry compatibility extends to:

• Lexus GX 400 (1GR‑FE, 2012–present, primarily Asian markets)
• Toyota Land Cruiser 79 Series (1GR‑FE, 2009 onward)

For parts distributors, this single SKU covers the majority of Toyota's 4.0L V6 product line from 2003 through 2015. Always verify fitment using VIN or engine code before ordering.

Multi‑Layer Steel (MLS) Cylinder Head Gaskets
The 1GR‑FE uses steel‑laminate MLS head gaskets with elastomer coating on the sealing beads. Unlike older composition gaskets, MLS design maintains consistent clamping force through thousands of thermal cycles. The stainless steel fire rings around each 94.0 mm bore resist corrosion and maintain sealing force at exhaust gas temperatures up to 800°C. The compressed operating thickness ranges from 0.036″ to 0.051″ depending on application, with typical OE thickness of approximately 0.040″ for the 1GR‑FE.

Complete Single‑Kit Solution for 1GR‑FE V6
This overhaul set replaces the need to source individual gaskets from multiple suppliers—a critical advantage for the 1GR‑FE, which requires distinct left and right bank gaskets, separate intake plenum gaskets, and 24 valve stem seals (12 intake, 12 exhaust, colour‑coded for correct placement). One part number covers the cylinder heads, valve covers, intake/exhaust manifolds, timing cover, oil pan, all valve stem seals, O‑rings, and peripheral gaskets.

24‑Valve DOHC Compatibility with Colour‑Coded Stem Seals
The 1GR‑FE's DOHC valvetrain uses 24 valves—12 intake (gray stem seals) and 12 exhaust (black stem seals). This kit includes the correct quantity of each colour, eliminating the risk of mixing intake and exhaust seals, a common error during reassembly that leads to oil consumption. The seals are manufactured from Viton/fluoroelastomer, rated for continuous 200°C service.

Heat‑Resistant Elastomer Seals
All O‑rings and rubber gaskets in this kit are manufactured from heat‑resistant materials (NBR, EPDM, or FKM depending on application). The injector O‑rings resist swelling from fuel exposure, and the camshaft seals maintain flexibility through winter cold starts and summer heat soak.

Extensive OE Cross‑Reference Coverage
The 04111-31050 kit accepts multiple supersession numbers: 04111-31340, 04111-31341, 04111-31342, 04111-31343, 04111-31510, 04111-31511, and many others. When a customer searches by any of these numbers—whether in OE parts look‑ups or aftermarket cross‑reference databases—this listing provides the correct fitment.

IATF 16949 / ISO 9001 Certified Manufacturing
The kit is manufactured under IATF 16949 and ISO 9001 certified quality management systems—the automotive industry's highest standard for component production. Material certificates and dimensional inspection records are retained per batch.

Each batch of the Toyota 1GR-FE engine overhaul gasket kit undergoes the following verifications:

A certificate of conformance (COC) with batch test data is available for wholesale orders.

Common gasket failure patterns on 1GR‑FE engines:

The 1GR‑FE is a robust engine, but two common issues directly involve gaskets:

• Rocker cover seepage with age: The 1GR‑FE's valve cover gaskets commonly develop minor oil leaks as mileage accumulates. Fresh gaskets applied with careful torque to factory specification (Toyota TIS) usually resolve the seepage.
• Cooling system neglect leading to head gasket failure: Overheating is a primary cause of head gasket issues on the 1GR‑FE. When the engine overheats, the aluminium cylinder head expands excessively, pinching the head gasket and reducing its sealing ability. The cooling system should be maintained with Toyota Super Long Life Coolant (SLLC, pink) to protect sealing surfaces.

Recommended Replacement Indicators:

Procedural notes when using this gasket kit:

When performing any engine overhaul that includes head gasket replacement on a 1GR‑FE engine, the following should be observed:

• Always replace cylinder head bolts with new genuine‑spec bolts. Torque‑to‑yield bolts cannot be reused. Consult the Toyota Repair Manual for the correct tightening sequence (typical: staged torques followed by 90° angle turns).
• Install the cylinder head within 15 minutes of applying seal packing (Toyota Genuine Seal Packing Black, Three‑Bond 1282B, or equivalent FIPG). The 1GR‑FE service procedure specifies that cylinder head installation must occur within this time window to ensure proper sealant activation.
• Apply a light coat of engine oil to new valve stem oil seals before installation. Use the Special Service Tool (SST 09201-41020) to push in the seals—failure to use SST will cause seal damage.
• Do not confuse intake and exhaust valve stem seals: Intake oil seals are gray, exhaust oil seals are black. Installing the incorrect colour will cause installation problems and potential oil consumption.
• Check cylinder head and block surfaces for warpage using a precision straight edge. Warpage beyond spec (typically >0.05 mm) will cause gasket failure regardless of gasket quality.
• Clean and chase all bolt holes in the cylinder block to remove debris and old thread sealant. Compressed air should be used to clear each hole before bolt installation.
• Replace the timing chain tensioner and guides while the timing cover is removed for access—not mandatory, but recommended on high‑mileage engines (exceeding 200,000 km).
• Use only Toyota Super Long Life Coolant (SLLC, pink) or equivalent ethylene‑glycol coolant mixed 50/50 with distilled water.
• Consider professional installation. Head gasket replacement on the 1GR‑FE V6 is a complex procedure requiring specialised tools (torque‑angle gauge, precision straight edge, valve spring compressor SST 09202-70020) and access to the Toyota Repair Manual.

Maintenance schedule for 1GR‑FE engines:

• Replace engine coolant every 5 years or 100,000 km — degraded coolant accelerates head gasket corrosion
• Inspect rocker cover gaskets for oil seepage at every oil change
• Address any overheating event immediately — prolonged overheating will warp the aluminium cylinder heads
• When the cylinder head is removed for any reason (head gasket replacement, valve work), always replace the head bolts and the full set of gaskets in this overhaul kit
• The sump plug washer should be replaced at each oil change to prevent drips

• Individual packaging: Sealed in anti‑static VCI bag, foam‑lined carton
• Carton dimensions: Approximately 17.5 * 9.3 * 1.1 inches (44 * 24 * 3 cm)
• Net weight: Approximately 2.50 lb (1.13 kg)
• Gross weight (with packaging): Approximately 1.5 kg
• Master carton: 20 units per export carton (palletizable)
• Lead time: 3–7 working days for stock orders; 15–25 days for production orders above 100 pieces
• Minimum order quantity: 1 piece (sample order available)
• Shipping methods: FedEx, UPS, DHL for samples; sea freight (LCL/FCL) from Shanghai, Ningbo, Guangzhou ports
• H/S Code: 8484.90

For workshops planning a full engine rebuild, the supplier also stocks matching 1GR‑FE cylinder head bolts, timing chain kits, water pumps, and piston ring sets for complete engine overhaul. Contact the sales team with your forecasted monthly volume and destination port for a tiered price list.

The Toyota 1GR-FE engine overhaul gasket kit 04111-31050 is a complete OE‑spec sealing solution for the 4.0L V6 petrol engine in 4Runner, Tacoma, Tundra, FJ Cruiser, Land Cruiser, Land Cruiser Prado, Fortuner, and Hilux vehicles from 2003 to 2015. The kit includes MLS cylinder head gaskets, valve cover gaskets, intake/exhaust manifold gaskets, colour‑coded valve stem seals (24 total), and all associated O‑rings and gaskets. IATF 16949 certified with multiple OE cross‑reference numbers (04111-31340, 04111-31343, 04111-31510, etc.).