BMW S50B30, S50US Engine Workshop Manual
This section contains a detailed guide to servicing, diagnostics, and repair of the BMW S50B30 (European version) and S50US (American version) engines. This material is intended for service center specialists and experienced mechanics performing engine maintenance and overhauls.
- Displacement: 3.0 L (2990 cc)
- Configuration: Inline 6-cylinder
- Power: US 240 hp (179 kW) at 6000 rpm / EU 286 hp (210 kW) at 7000 rpm
- Torque: US 305 Nm at 4250 rpm / EU 320 Nm at 3600 rpm
- System: Bosch Motronic
- VANOS: Intake only (single, like the M50TU)
- Intake: Conventional manifold (no individual throttle bodies)
- Block: Cast iron, aluminum cylinder head
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BMW S50B30, S50US Common Problems
1. VANOS System
S50B30 (Europe): seal wear, noise when cold, loss of traction.
S50US: VANOS only on the intake manifold, similar problems, but less common.
2. Electrical System and Sensors
Crankshaft and camshaft position sensor → starting errors and jerking.
Oxygen sensor → unstable idle, excessive fuel consumption.
Coolant temperature sensor → incorrect readings, overheating.
3. Fuel System
Clogged injectors.
Air leaks through intake manifold gaskets.
Fuel pump wear.
4. Lubrication and Oil
Increased oil consumption (especially at high RPMs).
Leaks from the valve cover and seals.
Oil pump wear due to high mileage.
5. Cooling
Radiator and hose leaks.
Water pump wear (often the plastic impeller).
Faulty thermostat → overheating or underheating.
6. Mechanical components
Worn valve guides.
Rotating bearings (due to aggressive driving and lack of oil).
Increased timing chain noise when stretched.