The Volvo B 28 F is a 2,849 cc, V6 petrol engine produced between 1975 and 1980. It features a cast‑iron block, overhead valves (OHV) actuated by pushrods, and a twin‑choke downdraft carburettor. In standard tune for the 260 series, it delivered approximately 97 kW (132 PS), providing smooth, effortless power for Volvo's flagship sedans and wagons.
Fitted exclusively to the Volvo 260 series (262, 264, 265), the B 28 F was engineered for refined, quiet cruising and strong low-end torque. Emissions compliance for North American and European markets was achieved through evaporative controls and modified carburetion, generally meeting US Federal and early national standards applicable for its production period.
One documented service consideration is the potential for distributor drive gear wear, a carryover issue from the inline-four B-series engines. This issue, noted in Volvo Service Bulletin 76‑04, can lead to ignition timing drift and misfires. The engine was derived from the earlier B30 but with two cylinders removed, sharing many core components.
Production years 1975–1980 predate formal Euro emissions standards. US models complied with applicable US Federal Motor Vehicle Safety Standards (FMVSS) for the model year (NHTSA Historical Data).
The Volvo B 28 F is a 2,849 cc V6 petrol engine engineered for large sedans and wagons (1975-1980). It combines a robust cast‑iron block with a simple OHV valvetrain and twin-choke carburetion to deliver smooth, linear power. Designed to meet contemporary US Federal and national emissions regulations, it prioritizes mechanical simplicity and ease of service over high performance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,849 cc | |
| Fuel type | Petrol | |
| Configuration | V6, OHV, 12‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 88.9 mm × 76.2 mm | |
| Power output | 97 kW (132 PS) @ 5,000 rpm | |
| Torque | 220 Nm @ 3,000 rpm | |
| Fuel system | Twin-choke downdraft carburettor (e.g., Zenith 36 NDIX) | |
| Emissions standard | US Federal (Pre-Catalyst) | |
| Compression ratio | 8.7:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain‑driven camshaft | |
| Oil type | SAE 20W‑50 (Mineral) | |
| Dry weight | Not specified in available OEM docs |
The OHV V6 design offers inherent smoothness and torque but is complex to service compared to inline engines. Regular oil changes (every 5,000-8,000 km) with quality mineral oil are critical. The twin-choke carburettor requires periodic synchronization and cleaning. Distributor drive gear wear, documented in Service Bulletin 76-04, can cause timing issues; inspect during major services. Genuine or high-quality reproduction parts are recommended for rebuilds.
Oil Specs: Original specification was SAE 20W-50 mineral oil (Volvo Workshop Manual 1977). Modern high-detergent equivalents are often used.
Emissions: Formal Euro standards did not exist. US models complied with contemporary US Federal standards (NHTSA FMVSS).
Power Ratings: Measured under SAE gross horsepower standards common for the era (Volvo Technical Specification Sheet B28F).
Volvo Workshop Manual (1977 Edition)
Volvo EPC Archive Documentation (VEP-B28-001)
Volvo Service Bulletin 76-04
NHTSA FMVSS Historical Compliance Records
The Volvo B 28 F was used exclusively across Volvo's 260 Series platforms with longitudinal mounting. This engine was a derivative of the B30 inline-six, sharing many components, and received minor carburettor and emission control revisions over its lifespan. All adaptations are documented in OEM technical bulletins.
The engine code "B28F" is typically stamped on a flat pad on the left-hand side of the engine block, near the distributor. The casting number for the block is often 1245400. Visually, it is identified by its V6 configuration, cast-iron construction, side-mounted distributor, and twin-choke downdraft carburettor. Differentiation from the B30 is by its V6 layout and smaller displacement; it is distinct from later PRV V6 engines by its OHV valvetrain and carburetion.
The B 28 F's primary long-term concern is distributor drive gear wear, particularly in high-mileage examples. Volvo Service Bulletin 76-04 documented this as a cause of ignition timing drift. Consistent operation and adherence to maintenance schedules are critical for preventing drivability issues.
Analysis derived from Volvo service bulletins (1975-1980) and workshop manuals (1977). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLVO B-28-F.
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