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 pickup and Vanette, the Z24i was engineered for durability and ease of maintenance in commercial applications. Emissions compliance for its era was managed through throttle-body injection and basic exhaust systems, meeting pre-Euro standards for most markets.
One documented service concern is premature wear of the distributor drive gear, which can lead to ignition timing failure and engine stalling. This issue, referenced in Nissan Technical Service Bulletins for the D21 platform, was often linked to lubrication issues or material fatigue. Later production runs saw no major revision before the engine was phased out.
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 throttle-body injection system provides smoother operation than a carburetor but is less precise than multi-port systems. Regular oil changes are critical to prevent distributor gear wear; use only high-quality API SF/SG oil. The timing chain is generally robust but should be inspected for slack at high mileage. The low compression ratio allows the engine to run on lower-octane fuel without knocking, ideal for its intended rugged use.
Oil Specs: Requires API SF/SG specification oil for optimal protection (Nissan Owner's Manual D21). SAE 10W-30 is the typical recommendation.
Emissions: Pre-Euro certification applies to all models (VCA Type Approval Database).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across markets (Nissan Group PT-1988).
Nissan Technical Information System (TIS): Service Manuals SM-EC-85D21, SM-EC-85C22
Nissan Technical Bulletins: TB-87-015
SAE International: J1349 Engine Power Certification Standards
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.
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-85D21). The 8th VIN digit for D21 vehicles often corresponds to the engine type ('Z' for Z series). The Z24i is visually identified by its cast iron block, single cam cover, and the prominent throttle-body injector mounted centrally on the intake manifold. Critical differentiation from the Z24: Z24i has a fuel injector and associated wiring harness, while the Z24 uses a carburetor.
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.
Find answers to most commonly asked questions about NISSAN Z24I.
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Regulation (EC) No 715/2007
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