Kit Contents

A0101-5X01A is a comprehensive full gasket set, containing every sealing component required for a complete engine overhaul or top-end rebuild on the YD25DDTi--. While the exact contents may vary by supplier, a typical full gasket set for the YD25DDTi includes:

What is NOT included: Cylinder head bolts. The YD25DDTi uses torque‑to‑yield (stretch) cylinder head bolts. These are single-use fasteners and must be replaced whenever the cylinder head is removed. The recommended head bolts for the YD25DDTi are part number 11059-5X00A or equivalent.

Note on cylinder head gasket thickness: Nissan YD25DDTi engines may use different head gasket thicknesses depending on piston protrusion. The head gasket in this kit is typically MLS (Multi-Layer Steel) with thickness options ranging from approximately 0.925 mm to 1.025 mm-. Aftermarket cylinder head gaskets are available in thicknesses including 0.975 mm-. The specific thickness in this kit is designed to match the standard YD25DDTi specification. If your engine has been resurfaced or requires a specific thickness based on piston protrusion, confirm the requirement before ordering.

Applications

This Nissan engine overhaul gasket kit A0101-5X01A directly replaces factory sealing components in the following configurations--:

Nissan

 Mercedes-Benz (Cross‑Platform)

Engine Code Clarification: The YD25DDTi is the common-rail turbo-diesel variant of Nissan‘s YD25 engine family, equipped with a Variable Geometry System (VGS) turbocharger and intercooler-. It produces between 129 hp (95 kW) and 190 hp (140 kW) depending on the tuning variant-. This gasket kit is also compatible with other YD25 engine variants (YD25ETi, YD25K3LD-5LO)-, though the YD25DDTi is the most common application. For parts distributors, this single SKU covers a wide range of Nissan‘s 2.5L diesel product line, significantly reducing inventory complexity.

Features & Benefits

Multi-Layer Steel (MLS) Cylinder Head Gasket for Diesel Durability
The YD25DDTi uses a steel-laminate MLS head gasket with a heat-activated elastomer coating on the sealing beads. Unlike older composition gaskets, MLS design maintains consistent clamping force through thousands of thermal cycles—a requirement for the engine‘s 17.5:1 compression ratio- and common-rail injection system. The stainless steel fire rings around each 89.5 mm bore resist corrosion from combustion by-products and maintain their spring force at exhaust gas temperatures reaching 800 °C-.

Complete Single-Kit Solution for YD25DDTi Engine
This overhaul set replaces the need to source individual gaskets from multiple suppliers. One part number covers the cylinder head, valve cover, intake/exhaust manifolds, timing cover, oil pan, valve stem seals, O‑rings, and peripheral gaskets—eliminating the risk of missing a small but critical seal during reassembly-. The set is specifically matched to the YD25DDTi’s bore (89.5 mm) and common-rail fuel system architecture.

Heat-Resistant Elastomer Seals for Turbo-Diesel Application
All O‑rings and rubber gaskets in this kit are manufactured from heat‑resistant materials: NBR (nitrile) for oil‑exposed seals, EPDM for coolant system seals, and FKM (Viton) for high‑temperature applications. The fuel injector O‑rings resist swelling from diesel fuel exposure, and the camshaft seals maintain flexibility through winter cold starts and summer heat soak-.

Extensive OE Cross-Reference Coverage
The A0101-5X01A kit is directly superseded by A0101-5X00A and A0101-5X00B for the same engine family--. It is also cross-referenced with 10101-5X04A and 10101-VK526-. 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 for the YD25DDTi.

OE-Grade Quality – 1.391 kg
The kit weighs 1.391 kg (approx. 3.07 lb)--13, reflecting the comprehensive range of gaskets and seals included. The kit is manufactured in Japan to Nissan‘s original equipment specifications--13, ensuring material and dimensional accuracy for the YD25DDTi engine.

Prevents Common YD25DDTi Failure Patterns
The YD25DDTi engine is reliable but has documented issues that this gasket kit addresses:

• Oil leaks from the valve cover: The rocker cover gasket hardens and leaks oil onto the exhaust manifold—a common source of burning smell on high‑mileage Navara.

• Coolant loss through head gasket: Gradual coolant loss with no visible external leak is a definitive sign of head gasket failure. Replacing with this MLS unit and verifying the cylinder head is not warped is the permanent solution.

• Injector seal leakage: The injector O‑rings and copper washers (included) are critical for preventing combustion gas blow‑by and fuel contamination of engine oil.

IATF 16949 / ISO 9001 Certified Manufacturing
The gasket is manufactured under IATF 16949 and ISO 9001 certified quality management systems—the automotive industry‘s highest standard for component production. Each production batch is tracked with material certificates and dimensional inspection records.

Quality Control & Verification

Each batch of the Nissan engine overhaul gasket kit A0101-5X01A undergoes the following verifications:

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

Installation & Maintenance Recommendations

⚠️ IMPORTANT: The YD25DDTi uses torque‑to‑yield (stretch) cylinder head bolts. These are single‑use fasteners and must be replaced with new units whenever the cylinder head is removed. Reusing old bolts risks uneven clamping, head gasket failure, and cylinder head warping.

Why a quality gasket kit is critical for the YD25DDTi engine:

The YD25DDTi is a high-compression turbo-diesel engine with a common-rail injection system operating at pressures up to 1,600 bar. A failed head gasket allows combustion gases to pressurise the cooling system, leading to localised overheating and potential cylinder head cracking.

✅ Recommended Replacement Indicators (YD25DDTi‑specific symptoms):

Procedural notes when using this gasket kit (YD25DDTi engine):

When performing any engine overhaul that includes head gasket replacement on a YD25DDTi engine, the following should be observed:

• Always replace cylinder head bolts with new genuine‑spec bolts (Nissan OE: 11059-5X00A or equivalent). Torque‑to‑yield bolts cannot be reused. Consult the Nissan Repair Manual for the correct tightening sequence (typical: staged torques followed by 90° angle turns).

• Confirm head gasket thickness selection. YD25DDTi engines may use different head gasket thicknesses depending on piston protrusion. Standard MLS head gasket thickness for the YD25DDTi is approximately 0.925–1.025 mm-. If the cylinder head has been resurfaced during prior repairs, verify the required thickness before reassembly.

• Check cylinder head and block surfaces for warpage using a precision straight edge and feeler gauge. The YD25DDTi specification for head flatness is ≤0.05 mm across the full length. Warpage beyond spec 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).

• Flush the cooling system and fill with fresh ethylene‑glycol coolant mixed 50/50 with distilled water. Do not reuse old coolant—it may contain combustion‑gas contamination.

• Consider professional installation. Head gasket replacement on the YD25DDTi requires specialised tools: a torque‑angle gauge, a precision straight edge, and access to the Nissan Repair Manual. Expect 6–8 hours of labour in a professional workshop for a complete head gasket replacement on this engine.

Maintenance schedule for YD25DDTi engines:

Packaging & Supply

• Individual packaging: Sealed in anti‑static VCI bag, foam‑lined carton

• Carton dimensions: Approximately 55 × 40 × 5 cm

• Net weight: 1.391 kg-13

• Gross weight (with packaging): Approximately 1.8–2.0 kg

• Master carton: 20 units per export carton (palletisable)

• 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 YD25DDTi cylinder head bolts (11059-5X00A) , timing chain kits, water pumps (21010-5X000) , 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.

Quick Summary

The Nissan engine overhaul gasket kit A0101-5X01A is a complete OE‑spec sealing solution for the YD25DDTi 2.5L common-rail turbo-diesel engine in Navara (D22/D40/NP300), Cabstar (F24), NV350, Urvan, Murano (Z51), Pathfinder (R51), and Frontier vehicles from 2001 onward. The kit includes the MLS cylinder head gasket, valve cover gasket, intake/exhaust manifold gaskets, valve stem seals, and all associated O‑rings and seals. The kit weighs 1.391 kg and is manufactured in Japan to Nissan‘s original equipment specifications.

Supersession information: This kit is cross-referenced with A0101-5X00A, A0101-5X00B, 10101-5X04A, and 10101-VK526. The cylinder head bolts are torque‑to‑yield, single‑use, and not included—they must be ordered separately (OE: 11059-5X00A).

Order a sample unit today—restore your YD25DDTi engine to factory sealing with a single part number.