The 2.5-liter 20-valve Volvo B5254S engine was produced by the company from 1991 to 1999 and installed in popular models of the Swedish group such as the 850, C70, S70 or V70. The modified version of this engine with a catalyst had a different name - B5254FS. Modular engine series: B5202S, B5244S, B5244S2, B5244S4, and B5252S.
| Exact capacity | 2435 cm³ |
| Power system | injector |
| Engine power | 165 - 170 HP |
| Torque | 210 - 220 nm |
| Engine block | aluminum R5 |
| Block head | aluminum 20v |
| Cylinder diameter | 83 mm |
| Piston stroke. | 90 mm |
| Compression ratio | 10.3 - 10.5 |
| Engine features | V-VIS po 1996 year |
| Hydraulic compensator. | tak |
| Timing drive | strip |
| Timing phase adjuster | there is no |
| Turbocharging | there is no |
| What oils to use | 5.3 liters 5W-40 |
| Fuel type | 92 |
| Environmental class | EURO 2 |
| Approximate life expectancy | 400 000 HP |
| City | 12.4 litry |
| Route | 7.1 litry |
| Mixed | 9.2 litry |
The weight of the B5254S engine according to the catalog is 175 kg. The engine number B5254S is located at the junction of the block and the cylinder head. Until 1996, there was a finicky V-VIS system in the intake, but it was later abandoned. However, in general, this is a very reliable unit, which is only known for oil leaks. The rear crankshaft seal and the gasket of the oil pump are the most common places where it leaks. According to the schedule, the timing belt is changed every 75,000 km or if a valve failure occurs. The engine supports, water pump, fuel pump, and hydraulic lifters have a relatively low service life.
| 850 I (854) | 1991 - 1996 |
| C70 I (872) | 1998 - 1999 |
| S70 I (874) | 1996 - 1999 |
| V70 I (875) | 1996 - 1999 |
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