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 engineered for comfortable, torquey cruising. Its driving character is defined by linear power delivery and a smooth, quiet idle, ideal for highway travel and executive transport. Emissions compliance relied on basic carburettor calibration and exhaust aftertreatment, meeting Japanese 1978 emissions standards for its production period.
One documented concern is premature wear of the distributor drive gear, which can lead to ignition timing drift and misfires. This issue, referenced in Nissan Technical Bulletin NTB75-045, is often attributed to extended oil change intervals or the use of incorrect oil viscosity. Production ended in 1986 as Nissan transitioned to more advanced fuel-injected designs.
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 modest compression ratio allows for reliable running on standard unleaded fuel but demands strict adherence to valve clearance checks at 30,000 km intervals. API SF specification oil is critical for protecting the timing chain and distributor drive gear. Pre-heating via the automatic choke is essential for smooth cold starts. The timing chain is generally robust but should be inspected at major service intervals (120,000 km). Fuel quality meeting local standards is recommended to prevent carburettor jet clogging.
Oil Specs: Requires API SF (or equivalent) specification (Nissan SM-L24). SAE 10W-40 is recommended for all climates.
Emissions: Japanese 1978 certification applies to all 1969-1986 models (MLIT Type Approval #JIS-D-1001). No market-specific variations.
Power Ratings: Measured under JIS D 1001 standards. Output is consistent across all applications (Nissan PT-1982).
Nissan Technical Information System: Docs SM-L24, NTB75-045
Japan Ministry of Land, Infrastructure, Transport and Tourism (MLIT)
MLIT Type Approval Database (JIS-D-1001)
Japanese Industrial Standards: JIS D 1001 Engine Power Certification
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.
Locate the engine code stamped on the flat machined boss on the front of the cylinder block, near the water pump (Nissan SM-L24). The engine is visually identifiable by its inline-six configuration, SOHC valve cover, and front-mounted distributor. Critical differentiation from earlier L20B engines: L24 has a larger 2.4L displacement (L20B is 2.0L) and a different carburettor model. Service parts are generally compatible across all model years and applications.
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.
Find answers to most commonly asked questions about NISSAN L24.
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