103.984 engine — Mercedes-Benz 3.0 (3L)
3L · 190 hp
Engine overview
Vehicles with this engine
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | 103.984 |
| Capacity | 2960 cc |
| Idle speed | 600 - 800 rpm |
| Normal | 10.0 - 12.0 bar |
| Minimum | 8.5 bar |
| Differential limit between cylinders | 1.5 bar |
| Oil pressure | 3.0 / 3000 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | Bosch KE-Jetronic |
| Number of cylinders | 6 |
| Firing order | 1-5-3-6-2-4 |
| Timing stroboscopic (vacuum hose connected) | 6 - 11 / 700 ± 100 °/rpm |
| Ignition coil resistance, primary | 0.3 - 0.6 ohms |
| Ignition coil resistance, secondary | 8000 - 13000 ohms |
| Spark plugs (make and type) | Bosch H8DCO Champion S10YCC |
| Spark plug gap | 0.8 mm |
| Injection pressure/system pressure | 3.7 - 4.3 / 5.3 - 5.5 bar |
| CO exhaust gas | < 0.5 % |
| CO2 | 13 - 16 % |
| HC | 300 ppm |
| O2 | 0.5 - 2.0 % |
| CO at fast-idle speed | < 0.3 % |
| Fast-idle speed | 2200 - 2800 rpm |
| Lambda | 0.97 - 1.03 |
| Lambda change (Delta Lambda) | 0.02 |
| Oil temperature during test | 60 °C |
| Closed-loop test at: | 500 - 1100 rpm |
| Basic method (Germany only) | Nr. G4 |
| Alternative method (Germany only) | Nr. 1b, 0 ± 10 |
Cooling system
| Cap pressure | 1.4 bar |
| Thermostat opens at | 87 ± 2 °C |
Electrical
| Battery | 100 / 110 Ah |
| Alternator | 100 A |
Capacities
| Engine sump, incl. filter | 6.8 l |
| Manual transmission | 717.434 |
| Gearbox refill | 1.5 l |
| Automatic transmission | 722.363 |
| Initial filling | 7.3 l |
| Gearbox refill | 6.2 l |
| Differential | 1.1 l |
| Cooling system | 11.5 l |
| Air-conditioner refrigerant | 950 g |
| Air-conditioner compressor oil | 140 (10PA17) 150 (TRS105) ml |
Torque settings
| Cylinder head bolts — Stage 1 | 70 Nm |
| Cylinder head bolts — Stage 2 | 90 ° |
| Cylinder head bolts — Stage 3 | 90 ° |
| Spark plugs | 20 Nm |
| Main bearing cap — Stage 1 | 55 Nm |
| Main bearing cap — Stage 2 | 90 ° |
| Oil plug | 25 Nm |
| Manual transmission filler plug | 60 Nm |
| Manual transmission drain plug | 60 Nm |
| Automatic transmission drain plug | 14 Nm |
| Front hub | 12 Nm |
| Rear hub | 220 Nm |
| Wheel nuts | 110 Nm |
Workshop procedures for this engine
Step-by-step procedures from the workshop database.
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Get free diagnosis →Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
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The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.