The Nissan CG12DE is a 1,238 cc, inline‑four naturally aspirated petrol engine produced between 1992 and 2002. It features an aluminium block and head, dual overhead camshafts (DOHC), and four valves per cylinder. Output is modest, typically 55–63 kW (75–86 PS) and 105–110 Nm of torque, prioritising fuel efficiency and compact packaging for kei-car regulations.
Fitted primarily to the K11 Micra/March and W10 Cube, the CG12DE was engineered for urban mobility and low running costs. Emissions compliance for its production period was met through multi-point electronic fuel injection and a three-way catalytic converter, aligning with Japanese 1990s emissions standards (pre-Euro).
One documented concern is premature wear of the exhaust camshaft lobes, particularly in high-mileage examples, which can lead to a loss of power and misfires. This issue, referenced in Nissan service documentation for the K11 platform, is often attributed to marginal lubrication under sustained high loads or infrequent oil changes.
Production years 1992–2002 predate standardized Euro emissions regulations. Compliance was managed under Japanese Ministry of Land, Infrastructure, Transport and Tourism (MLIT) standards applicable at time of manufacture.
The Nissan CG12DE is a 1,238 cc inline‑four naturally aspirated petrol engine engineered for compact city cars (1992-2002). It combines a lightweight aluminium block with a DOHC valvetrain to deliver frugal, responsive performance. Designed for the emissions standards of its era, it prioritizes low weight and serviceability over peak output.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,238 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 71.0 mm × 78.0 mm | |
| Power output | 55–63 kW (75–86 PS) | |
| Torque | 105–110 Nm @ 4,000–4,400 rpm | |
| Fuel system | Multi-point electronic fuel injection (MPFI) | |
| Emissions standard | Pre-Euro (Japanese 1990s Standards) | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | SAE 5W-30 or 10W-30 (API SG/SH) | |
| Dry weight | 85 kg |
The DOHC design offers good volumetric efficiency for its size but demands precise valve clearance maintenance. Check and adjust clearances every 60,000 km to prevent noise and power loss. The chain-driven timing system is generally reliable but inspect for tensioner wear or guide noise at high mileage. Using the correct low-viscosity oil is crucial for protecting the camshafts, particularly the exhaust lobes, from premature wear.
Oil Specs: Requires SAE 5W-30 or 10W-30 specification meeting API SG/SH (Nissan SM-CG12). Modern API SN/SP equivalents are acceptable.
Emissions: Pre-dates Euro standards; certified under Japanese MLIT 1990s Emissions Law.
Power Ratings: Measured under JIS D 1001 standards (Nissan Global Product Data 1995).
Nissan Service Manual (SM-CG12)
Nissan Technical Bulletin (TB-93-008)
Nissan EPC (CG12DE)
Japanese Ministry of Land, Infrastructure, Transport and Tourism (MLIT) Regulations
The Nissan CG12DE was used across Nissan's K11/W10 platforms with transverse mounting. This engine received platform-specific adaptations-different intake manifolds and ancillary layouts for the Micra versus the Cube. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the rear of the cylinder block, near the transmission bellhousing (Nissan SM-CG12). The 8th VIN digit often corresponds to the engine type for Nissan vehicles of this era. Visually, the CG12DE can be identified by its dual cam covers and distributorless ignition system (coil packs). Differentiate from the CG10DE by displacement (1.2L vs 1.0L) and from the CG13DE by bore size. Service parts are generally consistent across applications but verify part numbers against the specific chassis code (K11, W10) as ancillary components may differ.
The CG12DE's primary long-term reliability risk is exhaust camshaft lobe wear, with elevated incidence in high-mileage or neglected engines. While not subject to modern failure statistics, Nissan workshop data from the mid-1990s noted this as a recurring wear item. Infrequent oil changes and sustained high-RPM operation accelerate this wear, making regular maintenance critical.
Analysis derived from Nissan technical bulletins (1992-2002) and historical workshop service data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about NISSAN CG12DE.
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