The BMW M43TU/M43B19 is a 1.9 liters (1,895 cc, 115.6 cu·in) straight-four, four-stroke cycle, natural aspirated gasoline engine from the BMW M43-family. The engine was manufactured from 1998 to 2002 at the Steyr engine plant.
The M43TU engine features a cast-iron cylinder block, a crankshaft with four counterweights and aluminum head with a chain-driven single overhead camshaft (SOHC) and two valves per cylinder (8 in total) with hydraulic tappets. Cylinder bore is 85.0 mm (3.35 in) and piston stroke is 83.5 mm (3.29 in). The compression ratio rating is 9.7:1.
This engine used a Multi Point Fuel Injection system (MPFI), the Bosch BMS 46 engine management system and a dual length intake manifold (BMW “DISA”). Redline is 6,200 rpm.
The BMW M43TU engine produced 105.0 PS (77.0 kW; 103.0 HP) at 5,300 rpm of maximum output power and 165.0 N·m (16.8 kg·m, 121.6 ft·lb) at 2,500 rpm of peak torque or 118.0 PS (87.0 kW; 117.0 HP) at 5,500 rpm of horsepower and 180.0 N·m (18.4 kg·m, 132.7 ft·lb) at 3,900 rpm of torque, depending on the engine version.
The breakdown of the engine code is as follows:
- M43 – Engine Family
- B – Gasoline
- 19 – 1.9 Liter displacement
- TU – Technical Update
General information
| Engine Specifications | |
| Engine code | M43TU/M43B19 |
| Layout | Four stroke, Inline-4 (Straight-4) |
| Fuel type | Gasoline |
| Production | 1998-2002 |
| Displacement | 1.9 L, 1,895 cc (115.6 cu in) |
| Fuel system | Multi Point Fuel Injection (MPFI) |
| Power adder | None |
| Max. horsepower | M43TUB19 UL: 105.0 PS (77.0 kW; 103.0 HP) at 5,300 rpm M43TUB19 OL: 118.0 PS (87.0 kW; 117.0 HP) at 5,500 rpm |
| Max. torque | M43TUB19 UL: 165.0 N·m (16.8 kg·m, 121.6 ft·lb) at 2,500 rpm M43TUB19 OL: 180.0 N·m (18.4 kg·m, 132.7 ft·lb) at 3,900 rpm |
| Firing order | 1-3-4-2 |
| Dimensions (L x H x W): | – |
| Weight | – |
Cylinder block
| Cylinder block | ||
| Cylinder block alloy | Cast-iron | |
| Compression ratio: | 9.7:1 | |
| Cylinder bore: | 85.0 mm (3.35 in) | |
| Piston stroke: | 83.5 mm (3.29 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Number of main bearings: | 5 | |
| Cylinder inner diameter (standard): | 85.000-85.014 mm (3.3465-3.347 in) | |
| Piston skirt diameter (standard): | 84.985 mm (3.3459 in) | Piston ring side clearance: | Top | 0.020-0.200 mm (0.0008-0.0079 in) |
| Second | 0.020-0.100 mm (0.0008-0.0039 in) | |
| Piston ring end gap: | Top | 0.200-1.000 mm (0.0079-0.0394 in) |
| Second | 0.200-1.000 mm (0.0079-0.0394 in) | |
| Crankshaft journal diameter: | 60.000 mm (2.3622 in) | |
| Crankpin journal diameter: | 45.000 mm (1.7717 in) | |
Cylinder head
| Cylinder head | ||
| Valve Arrangement: | SOHC, chain-driven | |
| Valves: | 8 (2 valves per cylinder) | |
| Intake/Exhaust duration: | – | |
| Valve head diameter: | INTAKE | 42.000 mm (1.6535 in) |
| EXHAUST | 36.000 mm (1.4173 in) | |
| Valve steam diameter: | INTAKE | 6.975-7.000 mm (0.2746-0.2756 in) |
| EXHAUST | 6.960-7.000 mm (0.274-0.2756 in) | |
Maintenance data
| Oil system | |
| Recommended engine oil | SAE 0W-40, 5W-30, 5W-40 |
| Oil type | API SG or SF and better |
| Engine oil capacity (Refill capacity) | 4.0 L (4.23 US. qt, 3.52 Imp. qt.) |
| Ignition system | |
| Spark plug | Bosch FGR7DQP, NGK BKR6EQUP |
| Spark plug gap: | 0.5 mm (0.0197 in) |
Vehicle applications
| Model | Years Produced |
| M43TUB19 UL | |
| BMW 316i Compact (E36) | 1999-2001 |
| BMW 316i (E46) | 1999-2002 |
| M43TUB19 OL | |
| BMW 318i/318Ci (E46) | 1998-2001 |
| BMW Z3 1.9 | 1999-2002 |
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