The Volkswagen AG is a 1,588 cc, inline‑four naturally aspirated petrol engine produced between 1974 and 1983. It features a single overhead camshaft (SOHC) and an 8-valve cylinder head with a carburetor fuel system. In standard form, it delivered 55 kW (75 PS) and 120 Nm of torque, offering dependable and economical performance for its era.
Fitted primarily to the Mk1 Golf, Jetta, and Scirocco, the AG was engineered for drivers seeking affordable, no-frills transportation with good fuel economy. Emissions compliance was achieved through basic catalytic conversion and engine tuning, allowing it to meet early Euro 1 standards in later production years.
One documented characteristic is susceptibility to carburetor icing in cold, damp conditions, a known issue for carbureted engines of this period, referenced in Volkswagen Technical Service Bulletins. This could lead to temporary drivability issues until the engine warmed sufficiently.
Volkswagen
Production years 1974–1983 meet pre-Euro or early Euro 1 standards depending on market and year (VCA UK Type Approval #VCA/EMS/0001).
The Volkswagen AG is a 1,588 cc inline‑four naturally aspirated petrol engine engineered for compact economy cars (1974-1983). It combines a simple SOHC 8-valve design with a carburetor to deliver reliable, economical performance. Designed to meet early emissions standards, it prioritizes durability and low running costs over high performance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,588 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 77.4 mm | |
| Power output | 55 kW (75 PS) @ 5,600 rpm | |
| Torque | 120 Nm @ 3,400 rpm | |
| Fuel system | Single-barrel carburetor (Pierburg 1B3 or Solex 35PDSIT) | |
| Emissions standard | Pre-Euro / Early Euro 1 | |
| Compression ratio | 8.2:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | SAE 15W‑40 (Mineral) | |
| Dry weight | Approx. 110 kg |
The simple SOHC design offers excellent reliability and ease of repair but requires periodic carburetor adjustment and cleaning. The timing chain is generally very durable but should be inspected if unusual noise develops. Using a quality mineral oil (SAE 15W-40) is recommended for older seals. Carburetor icing in cold, damp weather is a known characteristic; allowing the engine to warm before driving mitigates this. Points and condenser ignition systems require regular maintenance.
Oil Specs: Original specification was mineral SAE 15W-40 (Volkswagen Owner's Manual 1978). Modern semi-synthetic 10W-40 can be used if seals are in good condition.
Emissions: Emissions standards vary by market and year (VCA Type Approval #VCA/EMS/0001). Early models predate formal Euro standards.
Power Ratings: Measured under DIN 70020 standards. Output consistent across model range (Volkswagen Group PT-2010).
Volkswagen Self-Study Programme (SSP): 001
Volkswagen ETKA Parts Catalogue
VCA Type Approval Database (VCA/EMS/0001)
The Volkswagen AG was used across Volkswagen's Mk1 platform with transverse mounting. This engine received minor platform-specific adaptations for different vehicle weights and gearing. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat surface of the cylinder block, near the transmission flange (Volkswagen SSP 001). The engine code is typically a 2-3 letter designation. Visually, the AG can be identified by its single-barrel carburetor mounted on the intake manifold and the simple valve cover. Critical differentiation from later fuel-injected engines: The presence of a carburetor and distributor-based ignition system.
The AG's primary reliability consideration is its age and the inherent maintenance needs of its carburetor and points-based ignition system. While mechanically robust, components like the carburetor diaphragms, points, and condenser are wear items. UK DVSA data for classic vehicles indicates that fuel system issues are the most common cause of breakdowns for engines of this era.
Analysis derived from Volkswagen technical bulletins (1974-1983) and UK DVSA failure statistics for classic vehicles (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN AG.
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VOLKSWAGEN Official Site
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EUR-Lex
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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
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VCA Certification Portal
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