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 Laurel (C32), the L24S was engineered for refined cruising and dependable performance in executive sedans. Emissions compliance for its era was managed through the electronic fuel injection system and basic catalytic converter, meeting pre‑Euro standards.
One documented concern is failure of the Bosch L-Jetronic fuel injection system's air flow meter (AFM), highlighted in Nissan Service Bulletin ESM‑L24S‑001. This issue, often linked to wear in the AFM's internal potentiometer track, can cause erratic idle, hesitation, or stalling due to incorrect air/fuel mixture signals.
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 inline-six layout provides inherent smoothness ideal for luxury sedans but requires regular oil changes (every 10,000 km) with quality 10W-40 mineral oil to prevent timing chain wear. The non-interference design provides a safety margin if the chain fails. Valve clearances need manual adjustment every 40,000 km. The Bosch L-Jetronic system is robust but sensitive to AFM and sensor failures; keeping electrical connections clean and dry is critical per Nissan SIB ESM-L24S-001. The engine is known for its mechanical longevity when basic maintenance is observed.
Oil Specs: Requires SAE 10W-40 specification (Nissan ESM 330 Cedric). API SF/CC or equivalent recommended.
Emissions: Pre-Euro certification applies to all models (VCA Type Approval Database for chassis 330/C32).
Power Ratings: Measured under JIS D 1001 standards. Output varies by specific ECU calibration and market (Nissan ESM 330 Cedric).
Nissan Electronic Service Manual (ESM): 330 Cedric, C32 Laurel
VCA Type Approval Database (Search by Chassis Code)
JIS D 1001 Engine Power Measurement Standards
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.
Locate the engine code stamped on the flat machined surface on the left side of the cylinder block, near the rear of the engine (Nissan ESM 330). The code will read "L24S". Visual identification: Features a long, straight six-cylinder layout with a single cam cover and a prominent Bosch L-Jetronic air flow meter (AFM) on the intake. Critical differentiation from L24: L24 is carbureted; L24S has electronic fuel injection. Critical differentiation from L28: L28 is a 2.8L engine with a longer stroke. Service parts for the fuel injection system are specific to the L24S variant.
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.
Find answers to most commonly asked questions about NISSAN L24S.
Comprehensive technical documentation and regulatory references
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NISSAN Official Site
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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
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