B5254T2 engine — Volvo 2.5 (2.5L)
2.5L · 209 hp
Engine overview
Vehicles with this engine
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | B 5254 T2 |
| Capacity | 2521 cc |
| Idle speed | 670 rpm |
| Inlet | 0.20 ± 0.03 mm |
| Exhaust | 0.40 ± 0.03 mm |
| Normal | 13.0 - 15.0 bar |
| Oil pressure | 1.0 / 670 3.5 / 4000 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | Bosch Motronic ME 7.01 |
| Number of cylinders | 5 |
| Firing order | 1 - 2 - 4 - 5 - 3 |
| Timing stroboscopic (before TDC) | 5 ± 2 / 850 °/rpm |
| Ignition coil resistance, primary | 0.5 - 1.5 ohms |
| Ignition coil resistance, secondary | 8000 - 9000 ohms |
| Spark plugs (make and type) | Volvo 86 92 071 |
| Spark plug gap | 0.7 mm |
| Injection pressure/system pressure | 3.8 bar |
| Lambda | 0.97 – 1.03 |
| CO at fast-idle speed | < 0.3 % |
Cooling system
| Cap pressure | 1.5 bar |
| Thermostat opens at | 90 °C |
| Fan on at | 70 °C |
Electrical
| Battery | 70 / 90 Ah |
| Battery | 120 / 170 Ah |
| Alternator | 140 / 160 A |
Capacities
| Engine sump, incl. filter | 5.5 l |
| Manual transmission | M66 AWD |
| Gearbox refill | 2.0 l |
| Automatic transmission | AW55-50 AWD |
| Initial filling | 7.2 l |
| Gearbox refill | 3.0 l |
| Differential, 4WD rear | 0.7 l |
| Cooling system | 8.8 l |
| Power steering | 1.0 l |
| Air-conditioner refrigerant | 1000 g |
| Air-conditioner refrigerant | 1300 g |
| Air-conditioner compressor oil | 180 ml |
| Air-conditioner compressor oil | 200 ml |
Torque settings
| Cylinder head bolts — Stage 1 | 20 Nm |
| Cylinder head bolts — Stage 2 | 60 Nm |
| Cylinder head bolts — Stage 3 | 130 ° |
| Spark plugs | 30 Nm |
| Big-end bearing cap — Stage 1 | 30 ± 3 Nm |
| Big-end bearing cap — Stage 2 | 90 ° |
| Inlet manifold | 20 Nm |
| Exhaust manifold | 25 Nm |
| Knock sensor | 20 Nm |
| Wheel bolts | 140 Nm |
Emissions
| Emission code | 70/220*2003/76B |
| Emission standard | Euro 4 |
| CO2 average | 282 g/km |
| CO | 0.236 g/km |
| HC | 0.029 g/km |
| NOx | 0.012 g/km |
| CO2 average | 280 - 282 g/km |
| Emission code | 70/220*2001/100B |
| CO2 average | 269 - 273 g/km |
| CO | 0.330 - 0.341 g/km |
| HC | 0.026 - 0.030 g/km |
| NOx | 0.023 - 0.026 g/km |
| Emission code | 70/220*2002/80B |
| CO2 average | 266 - 269 g/km |
| CO | 0.311 g/km |
| HC | 0.023 g/km |
| NOx | 0.020 g/km |
| CO2 average | 282 - 287 g/km |
| CO | 0.180 g/km |
| HC | 0.040 g/km |
| NOx | 0.030 g/km |
Workshop procedures for this engine
Step-by-step procedures from the workshop database.
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TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
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The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.