The Nissan Z24i is a 2,389 cc, inline‑four naturally aspirated petrol engine produced between 1985 and 1990. It features a cast iron block, aluminium head, and a single overhead camshaft (SOHC) with 8 valves, representing an evolution of the carbureted Z24 with throttle — body fuel injection. Output was standardized at approximately 86 kW (117 PS) and 194 Nm of torque, prioritising low — RPM torque and drivability for utility vehicles.
Fitted primarily to the D21 Hardbody…
Production years 1985–1990 meet pre-Euro standards (VCA UK Type Approval data for relevant chassis codes).
The Nissan Z24i is a 2,389 cc inline‑four naturally aspirated petrol engineered for pickup trucks and vans (1985-1990). It combines throttle-body fuel injection with a robust SOHC valvetrain to deliver strong low‑end torque and renowned simplicity. Designed for pre-Euro compliance, it prioritises mechanical durability and ease of service over peak efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,389 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 89.0 mm × 96.0 mm | |
Power output | 86 kW (117 PS) | |
Torque | 194 Nm @ 2,400 rpm | |
Fuel system | Throttle-body injection (TBI) | |
Emissions standard | Pre-Euro | |
Compression ratio | 8.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven SOHC | |
Oil type | API SF/SG or equivalent (SAE 10W-30) | |
Dry weight | Approx. 210 kg |
The Nissan Z24i was used across Nissan's D21/C22 platforms with longitudinal mounting. This engine received platform-specific adaptations-different accessory brackets in the Vanette versus the Hardbody-with no major running changes throughout its production life. All adaptations are documented in OEM technical bulletins.
The Z24i's primary reliability risk is distributor drive gear wear, often linked to lubrication neglect or material fatigue. Nissan service data indicates this is a significant cause of ignition-related breakdowns for high-mileage engines, while its simple mechanical design generally ensures long service life with basic maintenance. Timing chain stretch and TBI sensor failures are secondary concerns.
Analysis derived from Nissan technical bulletins (1987-1990) and general workshop failure statistics. Repair procedures should follow manufacturer guidelines.
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Yes, the Z24i is generally very reliable long-term due to its simple, robust design. The main known issue is distributor gear wear, which is a fixable problem. With this addressed and regular oil changes, these engines are known for their durability and can easily reach high mileage.
The most common and significant issue is premature wear of the distributor drive gear, leading to ignition failure. Other common problems include timing chain stretch at very high mileage, failures of TBI sensors (TPS, coolant temp), and valve cover gasket leaks due to age.
The Z24i was used primarily in the D21 generation Navara/Hardbody pickup (1985-1990) and the Vanette (C22) van/truck. It was the fuel-injected option for these utility vehicles during its production run.
Significant power tuning is difficult due to its throttle-body injection and low-compression design. Minor gains can be had from intake/exhaust modifications or advancing ignition timing, but the realistic approach is an engine swap for more power. Most owners value its reliability and torque over peak power.
Fuel economy is modest. Expect around 11.0-13.0 L/100km (26-22 mpg UK) combined for a pickup truck, depending on load, terrain, and driving style. Its design prioritizes torque and durability over fuel efficiency.
No. The Nissan Z24i is a non-interference engine. If the timing chain were to fail, the pistons and valves will not collide, preventing catastrophic internal damage. This is a key factor in its reputation for durability.
The Z24i requires a petrol-rated oil, typically API SF or SG specification. A 10W-30 viscosity is commonly recommended for its operating conditions. Using the correct oil is vital for protecting the engine, especially the distributor drive gear.
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