111.978 engine — Mercedes-Benz 2.3 (2.3L)
2.3L · 143 hp
Engine overview
Vehicles with this engine
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | 111.978 |
| Capacity | 2295 cc |
| Idle speed | 600 - 900 rpm |
| Normal | 10.5 - 12.0 bar |
| Differential limit between cylinders | 1.5 bar |
| Oil pressure | 0.9-4.0 / 750 2.0-6.0 / 1500 3.2-6.0 / 2000 3.6-6.0 / 3000 4.0-6.0 / 4000-6000 bar/rpm |
| Engine code | 111.978 (M 111 E23) |
Engine (petrol)
| Fuel system (make and type) | PMS |
| Number of cylinders | 4 |
| Firing order | 1-3-4-2 |
| Spark plugs (make and type) | Champion RC 10 DMC NGK BKR 6 EK |
| Spark plug gap | 0.8 mm |
| CO exhaust gas | 0.5 % |
| CO at fast-idle speed | 0.3 % |
| Fast-idle speed | 2500 ± 300 rpm |
| Lambda | 0.97 - 1.03 |
| Oil temperature during test | 60 °C |
Cooling system
| Cap pressure | 1.4 ± 0.1 bar |
| Thermostat opens at | 87 ± 2 °C |
Electrical
| Battery | 66 Ah |
| Alternator | 90 A |
Capacities
| Engine sump, incl. filter | 7.5 l |
| Manual transmission | GTO 24-5/3.769-0.721 |
| Gearbox refill | 1.9 l |
| Automatic transmission | ZF 4HP20 |
| Gearbox refill after overhaul | 8.1 l |
| Gearbox refill | 4.4 l |
| Gearbox refill after overhaul | 8.6 l |
| Gearbox refill | 4.9 l |
| Cooling system | 8.7 l |
| Air conditioning | 7SB16 |
| Air-conditioner refrigerant | 850 g |
| Air-conditioner refrigerant | 1100 (HH7) g |
| Air-conditioner compressor oil | 175 ml |
| Air-conditioner compressor oil | 410 ml |
| Air conditioning | 10PA17C |
| Air-conditioner refrigerant | 920 g |
| Air-conditioner compressor oil | 120 ml |
| Air conditioning | SD7V16 |
| Air-conditioner compressor oil | 135 ml |
Torque settings
| Cylinder head bolts — Stage 1 | 55 Nm |
| Cylinder head bolts — Stage 2 | 90 ° |
| Cylinder head bolts — Stage 3 | 90 ° |
| Cylinder head (M8 bolts) | A |
| Camshaft bearing caps | 21 Nm |
| Spark plugs | 28 Nm |
| Oxygen sensor | 55 Nm |
| Max. bolt length | 63.8 mm |
| Big-end bearing cap — Stage 1 | 5 Nm |
| Big-end bearing cap — Stage 2 | 25 Nm |
| Big-end bearing cap — Stage 3 | 90 ° |
| Oil plug | 30 Nm |
| Front hub | 435 Nm |
| Rear hub | 435 Nm |
| Wheel nuts | 175 Nm |
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.
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.
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The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.