The Volvo B 28 A is a 2,849 cc, V6 naturally aspirated petrol engine produced between 1975 and 1980. It features a cast‑iron block, overhead valve (OHV) design with pushrods, and a twin‑choke downdraft carburettor. In standard form, it delivered approximately 96 kW (130 PS) and 220 Nm of torque, providing smooth, effortless power for Volvo's flagship sedan.
Fitted exclusively to the 260 Series (262, 264, 265) during this period, the B 28 A was engineered for refined, quiet c…
Production years 1975–1980 meet early national emissions standards; no formal EU type approval existed for this era (VCA UK Historical Archive).
The Volvo B 28 A is a 2,849 cc V6 naturally aspirated petrol engine engineered for flagship sedans and wagons (1975-1980). It combines a robust cast‑iron block with a simple OHV pushrod valvetrain to deliver smooth, dependable performance. Designed to meet early national emissions standards, it prioritizes refinement and torque over peak power.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,849 cc | |
Fuel type | Petrol | |
Configuration | V6, OHV, 12‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 88.9 mm × 76.0 mm | |
Power output | 96 kW (130 PS) @ 5,200 rpm | |
Torque | 220 Nm @ 3,200 rpm | |
Fuel system | Twin-choke Zenith-Stromberg 175 CD2SE carburettor | |
Emissions standard | Early National Standards (US/EU) | |
Compression ratio | 8.7:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven camshaft | |
Oil type | SAE 20W-50 (Mineral) | |
Dry weight | 185 kg |
The Volvo B 28 A was used exclusively across Volvo's 260 Series platform with longitudinal mounting. This engine received platform-specific adaptations-minor variations in exhaust manifolds and engine mounts between sedan and wagon body styles. All adaptations are documented in OEM technical bulletins.
The B 28 A's primary reliability consideration is distributor drive gear wear, with elevated incidence in high-mileage or poorly maintained examples. Volvo internal service data from the 1970s indicated frequent need for distributor overhaul, while owner surveys highlight carburettor and ignition system wear as common causes of drivability complaints. Infrequent maintenance and use of incorrect oil make ignition system issues critical.
Analysis derived from Volvo technical bulletins (1975-1980) and Volvo Owners Club historical failure surveys (1980-2000). Repair procedures should follow manufacturer guidelines.
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The B 28 A is renowned for its robust cast-iron construction and simple OHV design, making it very reliable if maintained correctly. Key to longevity is adhering to valve adjustments, using the correct SAE 20W-50 oil, and maintaining the carburettor and ignition system. Neglect, especially of the distributor drive gear, is the main cause of failure.
The most frequent issues are distributor drive gear wear (causing timing drift), Zenith-Stromberg carburettor problems (hesitation, stalling), and ignition system failures (points, condenser). Oil leaks from aged gaskets are also very common. These are well-documented in Volvo's original service literature.
The B 28 A was used exclusively in the Volvo 260 Series (262, 264, 265) from 1975 to 1980. It was the standard engine for these flagship models, providing smooth, effortless power compared to the smaller four-cylinder engines available in other Volvo lines.
Yes, modest power gains are possible. Common upgrades include fitting a performance camshaft, porting the cylinder heads, installing a higher-flow carburettor (like a Weber), and fitting a free-flow exhaust. Significant power increases are limited by the engine's displacement and OHV design. Reliability should be prioritized over extreme tuning.
Fuel economy is modest by modern standards. Expect around 14-16 L/100km (18-20 mpg UK) in mixed driving for a well-tuned 264. Highway cruising can yield closer to 12 L/100km (24 mpg UK). Economy is heavily dependent on the condition of the carburettor and driving style.
No. The Volvo B 28 A is a non-interference engine. If the timing chain were to fail or jump, the pistons will not contact the valves. This design protects the engine from catastrophic internal damage in the event of a timing failure, though the engine will simply stop running.
Volvo specified a high-quality SAE 20W-50 mineral oil for the B 28 A. This thicker oil is crucial for protecting the flat-tappet camshaft and the timing chain. Modern synthetic oils designed for flat-tappet engines can be used, but avoid thin, low-viscosity modern oils as they can accelerate wear.
Comprehensive technical documentation and regulatory references
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VOLVO Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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
Type-approval guidance and documentation.
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