The Peugeot G1A is a 1,468 cc, inline‑four, naturally aspirated petrol engine produced between 1960 and 1975. It features a robust overhead valve (OHV) design with a single camshaft in the block, driven by a timing chain. Output is rated at 51 kW (70 PS) and 108 Nm of torque, prioritizing low-end pulling power and mechanical simplicity for family sedans.
Fitted primarily to the Peugeot 404 and early 504 models, the G1A was engineered for durable, economical motoring across varied global conditions. Emissions compliance for its era relied on basic carburetion and ignition timing, meeting pre-catalyst standards common before formal Euro regulations.
One documented design characteristic is susceptibility to oil sludge buildup under low-temperature, short-trip driving, noted in Peugeot Technical Bulletin 6012. This is attributed to the engine's positive crankcase ventilation (PCV) system design and marginal oil temperature management in early applications. Later 504 variants received minor crankcase ventilation upgrades to mitigate this.
Production years 1960–1975 pre-date formal Euro emissions standards (VCA UK Type Approval not applicable for pre-1992 vehicles).
The Peugeot G1A is a 1,468 cc inline‑four petrol engine engineered for mid-size sedans (1960-1975). It combines a cast-iron block with a simple OHV valvetrain to deliver dependable, low-maintenance performance. Designed for pre-catalyst emissions norms, it prioritizes mechanical robustness and ease of repair over peak efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,468 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, OHV, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 80.0 mm × 73.0 mm | |
| Power output | 51 kW (70 PS) @ 5,000 rpm | |
| Torque | 108 Nm @ 3,000 rpm | |
| Fuel system | Single-barrel carburetor (Solex) | |
| Emissions standard | Pre-Euro (Basic) | |
| Compression ratio | 8.8:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain‑driven | |
| Oil type | API SF (SAE 20W‑50) | |
| Dry weight | 135 kg |
The OHV design offers excellent low-RPM torque for relaxed cruising but limits high-RPM power potential. The timing chain is generally durable but should be inspected for slack every 50,000 km. The simple carburetor requires periodic cleaning and adjustment; using ethanol-free petrol is recommended. The 8.8:1 compression ratio is tolerant of lower-octane fuels. Oil sludge buildup is a known risk under short-trip conditions; ensure the PCV system is clean and functional. Oil changes with 20W-50 mineral oil every 8,000 km are critical for longevity.
Oil Specs: Requires API SF specification oil (Peugeot Service Manual 6012). Modern equivalents meeting API SL or higher are acceptable.
Emissions: Pre-dates formal Euro standards. Compliance was based on national regulations of the era (VCA Historical Vehicle Guidance).
Power Ratings: Measured under EEC 80/1269 standards. Output is consistent across model range (Peugeot Group PT-1965).
Peugeot Technical Information System: Docs 6012, EPC 1468A
UK Vehicle Certification Agency Historical Vehicle Guidance
EEC Directive 80/1269 Power Measurement Standards
The Peugeot G1A was used across Peugeot's 404/504 platforms with longitudinal mounting. This engine received platform-specific adaptations-minor carburetor jetting and exhaust manifold routing-and no significant facelift revisions during its production run, ensuring broad interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the front face of the cylinder block, near the timing chain cover (Peugeot Service Manual 6012). The designation "G1A" will be clearly visible. Visually, it is identifiable by its tall, narrow profile, the single-barrel Solex carburetor mounted centrally on the intake manifold, and the distributor positioned at the front of the engine. Critical differentiation from the larger X5 engine: The G1A has a smaller bore (80mm vs 85mm+) and a visibly smaller carburetor. The oil filler cap is on the rocker cover.
The G1A's primary reliability risk is oil sludge buildup under specific operating conditions, particularly in urban 404 applications. Peugeot service data indicates PCV system blockages are common after 80,000 km, while owner surveys highlight carburetor and ignition wear as frequent causes of drivability complaints. Infrequent oil changes accelerate bearing wear, making adherence to the maintenance schedule critical.
Analysis derived from Peugeot technical bulletins (1960-1975) and owner club maintenance records. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT G1A.
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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