The Nissan TD25 is a 2,488 cc, inline‑four naturally aspirated diesel engine produced between 1986 and 1997. It features a cast iron block, indirect injection via a rotary distributor pump, and a single overhead camshaft (SOHC) design. Output varied by market and application, typically ranging from 59 kW (80 PS) to 66 kW (90 PS), with torque figures around 172–181 Nm, prioritising durability and low-RPM pulling power.
Fitted to utility and commercial platforms like the D21 Navara/Hardbody pickup, Pathfinder (WD21), and Vanette Cargo, the TD25 was engineered for reliability and torque under load in demanding conditions. Emissions compliance for its era was managed through basic mechanical injection and exhaust systems, meeting pre-Euro or early Euro 1 standards depending on the specific market and year.
One documented service concern is cylinder head cracking, particularly between cylinders 3 and 4, often linked to overheating events or coolant system neglect. This issue, referenced in Nissan Technical Service Bulletins for the D21 platform, can lead to coolant loss and combustion issues. Later production runs saw minor revisions to head casting and cooling jacket design to improve robustness.
Production years 1986–1997 generally meet pre-Euro or early Euro 1 standards depending on market and specific vehicle application (VCA UK Type Approval data for relevant chassis codes).
The Nissan TD25 is a 2,488 cc inline‑four naturally aspirated diesel engineered for pickup trucks and SUVs (1986-1997). It combines indirect injection with a robust SOHC valvetrain to deliver strong low‑end torque and renowned durability. Designed for pre-Euro/early Euro 1 compliance, it prioritises mechanical simplicity and longevity over peak efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,488 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 89.0 mm × 100.0 mm | |
| Power output | 59–66 kW (80–90 PS) | |
| Torque | 172–181 Nm @ 2,200 rpm | |
| Fuel system | Indirect injection, Bosch VE rotary pump | |
| Emissions standard | Pre-Euro / Early Euro 1 (Market Dependent) | |
| Compression ratio | 21.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven SOHC | |
| Oil type | API CC/CD or equivalent (SAE 15W-40) | |
| Dry weight | Approx. 220 kg |
The indirect injection system provides smooth, reliable power ideal for towing and off-road use but is less fuel-efficient than modern direct injection. Regular coolant system maintenance is critical to prevent cylinder head cracking; use only Nissan-approved coolant or equivalent ethylene glycol types. The Bosch VE pump requires clean, high-quality diesel fuel to prevent internal wear. Oil changes should adhere strictly to the 5,000-10,000 km interval using API CC/CD rated oil to protect the flat tappet camshaft. Pre-heating via glow plugs is essential for cold starts.
Oil Specs: Requires API CC/CD specification oil for flat tappet cam protection (Nissan Owner's Manual D21/WD21). SAE 15W-40 is the typical recommendation.
Emissions: Pre-Euro certification applies to most models; specific Euro 1 compliance for late models is chassis and market-dependent (VCA Type Approval Database).
Power Ratings: Measured under JIS D 1001 standards. Output varies by market and specific vehicle gearing (Nissan Group PT-1995).
Nissan Technical Information System (TIS): Service Manuals SM-EC-86D21, SM-EC-86WD21
Nissan Technical Bulletins: TB-91-034, TB-93-012
JIS D 1001 Engine Power Certification Standards
The Nissan TD25 was used across Nissan's D21/WD21 platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Navara and different accessory brackets in the Pathfinder-with minor running changes throughout its production life. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the left-hand side of the engine block, just below the cylinder head (Nissan SM-EC-86D21). The 8th VIN digit for D21/WD21 vehicles often corresponds to the engine type ('T' for TD series). The TD25 is visually identified by its large, cast iron block, single cam cover, and the prominent Bosch VE injection pump mounted on the right side. Critical differentiation from the TD27: TD25 has a 2.5L displacement (89mm bore) vs. TD27's 2.7L (96mm bore).
The TD25's primary reliability risk is cylinder head cracking, often following an overheating event. Nissan service data indicates this is a significant cause of major engine repairs for neglected cooling systems, while its simple mechanical design generally ensures long service life with basic maintenance. Coolant neglect and use of incorrect coolant make head gasket and head integrity critical.
Analysis derived from Nissan technical bulletins (1990-1997) and general workshop failure statistics. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about NISSAN TD25.
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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