112.976 engine — Mercedes-Benz 3.7 (3.7L)
3.7L · 231 hp
Engine overview
Vehicles with this engine
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | 112.976 (M112 E37) |
| Capacity | 3724 cc |
| Idle speed | 700 ± 50 rpm |
| Normal | 12.0 - 15.5 bar |
| Minimum | 10.0 bar |
| Differential limit between cylinders | 1.5 bar |
| Oil pressure | > 0.7 / 700 > 3.0 / 3000 bar/rpm |
| Engine code | 112.976 |
Engine (petrol)
| Fuel system (make and type) | Bosch Motronic ME 2.8 |
| Number of cylinders | 6 |
| Firing order | 1-4-3-6-2-5 |
| Spark plugs (make and type) | Beru 14FGH 8 DPURX 2 Bosch F8 DPER Bosch F8 DPP33 Champion KC 11PYP NGK IFR5D 10 NGK PFR 5 R-11 |
| Spark plug gap | 0.8 mm |
| CO at fast-idle speed | < 0.3 % |
| Fast-idle speed | 2200 - 2800 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 °C |
| Thermostat fully open at | 102 °C |
Electrical
| Battery | 88-100 Ah |
| Alternator | 120 A |
Capacities
| Engine sump, incl. filter | 10.0 l |
| Manual transmission | 716.637 |
| Gearbox refill | 1.2 l |
| Manual transmission | 716.652 |
| Gearbox refill | 1.5 l |
| Automatic transmission | 722.680 / 722.682 |
| Initial filling | 7.6 l |
| Gearbox refill | 7.0 l |
| Gearbox refill | 5.0 l |
| Differential | 1.5 l |
| Cooling system | 8.1 l |
| Cooling system | 9.9 l |
| Air-conditioner refrigerant | 550 g |
| Air-conditioner refrigerant | 840 g |
| Air-conditioner refrigerant | 870 g |
| Air-conditioner compressor oil | 190 ml |
Torque settings
| Cylinder head bolts — Stage 1 | 10 Nm |
| Cylinder head bolts — Stage 2 | 30 Nm |
| Cylinder head bolts — Stage 3 | 90 ° |
| Cylinder head bolts — Stage 4 | 90 ° |
| Cylinder head bolts — Stage 1 | 20 Nm |
| Spark plugs | 28 Nm |
| Main bearing cap | 20 Nm |
| Main bearing cap | 30 Nm |
| Side bolt of main bearing cap | 30 Nm |
| Big-end bearing cap | 5 Nm |
| Oil plug | 30 Nm |
| Rear hub — Stage 1 | 165 Nm |
| Rear hub — Stage 2 | 60 ° |
| Wheel bolts | 180 Nm |
| Wheel bolts | 150 Nm |
| Manual transmission drain plug | 35 Nm |
| Manual transmission filler plug | 35 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.