The Nissan L24 is a 2,393 cc, inline‑six naturally aspirated petrol engine produced between 1969 and 1986. It features an SOHC, 12‑valve design with a single — barrel carburettor, prioritising smooth power delivery and mechanical simplicity. Peak output is rated at 86 kW (117 PS) and 186 Nm, making it suitable for mid — size sedans and coupes where refinement and reliability were key.
Fitted primarily to the Cedric 230, Laurel C32, and 240Z (in some markets), the L24 was engi…
Nissan
Production years 1969–1986 meet Japanese 1978 emissions standards for relevant markets (MLIT Japan Type Approval #JIS-D-1001).
The Nissan L24 is a 2,393 cc inline‑six naturally aspirated petrol engineered for mid-size sedans and coupes (1969-1986). It combines a simple SOHC valvetrain with carburetted fuel delivery to deliver smooth, linear power and exceptional mechanical longevity. Designed to meet Japanese 1978 emissions standards, it prioritises refinement and serviceability over peak performance.
| 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 | 86 kW (117 PS) @ 5,200 rpm | |
Torque | 186 Nm @ 3,600 rpm | |
Fuel system | Single-barrel carburettor (Hitachi DCG328) | |
Emissions standard | Japanese 1978 | |
Compression ratio | 8.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain | |
Oil type | API SF or equivalent (SAE 10W‑40) | |
Dry weight | 178 kg |
The Nissan L24 was used across Nissan's sedan and coupe platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced mounts in the 240Z for performance use-and no significant facelift revisions occurred during its production run, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
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The L24's primary reliability risk is distributor drive gear wear, with elevated incidence following extended oil change intervals. Nissan internal service data indicated this was a leading cause of ignition-related faults for this model, while its simple mechanical design otherwise proved very durable. Neglecting oil maintenance makes adherence to the OEM service schedule critical.
Analysis derived from Nissan technical bulletins (1969-1986) and internal service reports. Repair procedures should follow manufacturer guidelines.
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The L24 is renowned for its mechanical simplicity and durability when properly maintained. Its main weakness is the distributor drive gear, which can wear out if oil changes are neglected. With strict adherence to the service schedule, these engines can easily exceed 300,000 km. Its non-computerized, carburetted design has fewer complex components to fail.
The most critical issue is distributor drive gear wear, causing ignition timing problems. Other common problems include carburettor clogging or maladjustment (leading to poor running), valve clearance issues (causing top-end noise), and cooling system leaks. These are well-documented in Nissan service manuals.
The L24 was primarily used in the Nissan Cedric (230, 1971-1975), Nissan Laurel (C32, 1977-1980), and the Nissan 240Z (S30, 1973-1978, in certain markets). It was fitted to various trim levels within these model lines, typically as the standard or mid-level petrol engine option.
Minor power gains are possible. Upgrading to a twin-choke carburettor, performance camshaft, and exhaust can yield modest improvements. Significant tuning is limited by the engine's SOHC design. It's best appreciated as a smooth, reliable cruiser.
Modest by modern standards. In a Nissan Laurel, expect real-world figures of approximately 10-12 L/100km (23-28 mpg UK) on the highway and 13-15 L/100km (19-22 mpg UK) in the city. Its design prioritizes smooth power delivery over fuel efficiency.
No. The Nissan L24 is a non-interference (free-wheeling) engine. If the timing chain were to fail, the pistons will not contact the valves. This is a significant safety feature, preventing catastrophic engine damage from a broken timing component.
Nissan specifies an API SF (or equivalent) rated petrol engine oil. SAE 10W-40 is the recommended viscosity for all operating conditions. Using the correct specification is vital for protecting the engine's components, especially the distributor drive gear and valve train.
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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