The Nissan L24S is a 2,393 cc, inline‑six naturally aspirated petrol engine produced between 1977 and 1986. It features a cast iron block, aluminum head, single overhead camshaft (SOHC), and electronic fuel injection (Bosch L — Jetronic). This design prioritized smooth power delivery and improved emissions control over its carbureted L24 predecessor, delivering outputs of 97–103 kW (132–140 PS).
Fitted to models such as the Nissan Cedric (330), Gloria (330), and Laur…
Nissan
Production years 1977–1986 meet applicable emissions standards for their respective model years and markets (VCA UK Type Approval data for relevant chassis codes).
The Nissan L24S is a 2,393 cc inline‑six naturally aspirated petrol engine engineered for executive sedans (1977-1986). It combines a smooth SOHC valvetrain with electronic fuel injection (Bosch L-Jetronic) to deliver refined, linear power. Designed to meet the pre‑Euro emissions standards of its production era, it prioritizes durability and mechanical simplicity.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,393 cc | |
Fuel type | Petrol | |
Configuration | Inline‑6, SOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 83.0 mm × 73.7 mm | |
Power output | 97–103 kW (132–140 PS) | |
Torque | 196–206 Nm @ 3,600 rpm | |
Fuel system | Electronic Fuel Injection (Bosch L-Jetronic) | |
Emissions standard | Pre‑Euro (Market specific) | |
Compression ratio | 8.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven | |
Oil type | SAE 10W‑40 (Mineral) | |
Dry weight | 185 kg |
The Nissan L24S was used across Nissan's 33x/C3x platforms with longitudinal mounting. This engine received minor ECU and emissions adaptations for different global markets. All adaptations are documented in OEM technical bulletins.
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The L24S's primary reliability risk is Bosch L-Jetronic air flow meter (AFM) failure, with elevated incidence in high-mileage or humid environments. Nissan service data indicates fuel system faults were a common cause for workshop visits, while UK DVSA records note ignition issues in neglected vehicles. Ensuring clean, dry electrical connections and using quality replacement parts make regular inspection critical.
Analysis derived from Nissan technical bulletins (1977-1986) and UK DVSA failure statistics (historical data). Repair procedures should follow manufacturer guidelines.
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Yes, the L24S is renowned for its long-term reliability and durability when basic maintenance is performed. Its simple, robust inline-six design and non-interference layout are very forgiving. Key to longevity is regular oil changes, timely valve adjustments, and addressing the known AFM weakness. Many examples have surpassed 300,000 km with proper care.
The most common issues are Bosch L-Jetronic air flow meter (AFM) failure causing drivability problems, ignition system component wear (distributor, coil, wires), valve clearance needing adjustment, and oil leaks from the valve cover or rear main seal. These are well-documented in Nissan service manuals.
The L24S was primarily used in the Nissan Cedric (330: 1977-1983), Nissan Gloria (330: 1977-1983), and Nissan Laurel (C32: 1980-1986) across various global markets. It was typically fitted to higher-spec variants like the GL, SGL, and Medalist.
Modest power gains are possible. Common upgrades include a performance air filter, free-flow exhaust, and ensuring the L-Jetronic system is in perfect working order. Significant power increases are limited by the SOHC 12-valve head design. Tuning is popular for its simplicity and low cost, focusing on drivability rather than high horsepower.
Fuel economy is moderate for its size and era. In a Nissan Cedric 330, expect around 10.0–11.0 L/100km (25–28 mpg UK) combined in real-world driving. Highway cruising can yield figures closer to 8.0–9.0 L/100km (31–35 mpg UK), depending on condition and driving style.
No. The Nissan L24S is a non-interference engine. This means that if the timing chain were to break or jump, the pistons will not contact the valves. This design significantly reduces the risk of catastrophic engine damage from timing component failure.
Nissan recommends a high-quality mineral SAE 10W-40 engine oil. Regular oil and filter changes every 10,000 km (or 6 months) are crucial for engine longevity, especially to protect the timing chain tensioner system from sludge buildup.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
NISSAN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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