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BMW M43 SOHC Straight-4 Engine
From 1991 to 2002
The BMW M43 is a four-cylinder - petrol engine of the car manufacturer BMW and successor of the BMW M40 . The crankcase (engine block) was taken over unchanged. Compared with the previous engine was in M43 of the toothed belt drive by a maintenance-free timing chain is replaced, the friction in the valve train by roller camreduced, the failure-prone ignition distributor by an ignition system with static high-voltage distribution replaced, facilitates the crankshaft and increases the compression slightly. Furthermore, the accessory drive, the crankcase breather, the thermostat housing and the intake system have been reworked. The latter was now streamlined and designed as a differentiated suction system (DISA).
The BMW M43 came from 1994 in the BMW E36 316i and 318i.
In addition, there were two gasoline- natural gas variants, which in the model designation a "g" wore instead of an "i". Offered was the bivalent gasoline natural gas drive in the E36 series as 316g compact (two-seater) and in the E34 series as 518g touring . Because of its torque curve, the M43 was especially suitable for bivalent drive.
The launch of the E46 M43 has been technically revised and henceforth used as M43TÜ, until 2001 by his two successors N40 and N42 has been replaced.
The BMW M43 is a straight-4 SOHC piston engine which replaced the M40 and was produced from 1991-2002. Displacement ranges from 1.6 L to 1.9 L. The M43 powered base-model cars, while higher performance models at the time were powered by the DOHC M42 (and its M44 successor).A variant using natural-gas was produced for the E36 318g and the E34 518g.Compared with its M40 predecessor, it features a dual length intake manifold (called "DISA" by BMW) to provide torque across a wider rev range, knock sensing and a timing chain (instead of the M40's timing belt).The M43 was produced at the Steyr engine plant. A total of 1,204,734 units were produced.In 1998 the displacement was increased to 1.9 litres, increasing torque to 180 Nm at 3900 rpm.
Engine data
| engine type | capacity | Bore × stroke | Valves / cyl. | compression | Power at 1 / min | Torque at 1 / min | construction time |
|---|---|---|---|---|---|---|---|
| M43B16 | 1.6 l (1596 cm 3 ) | 84 mm × 72 mm | 2 | 9.7: 1 | 75 kW (102 hp) at 5500 | 150 Nm at 3900 | 1993-1999 |
| 64 kW (87 hp) at 5500 A | 127 Nm at 3900 A | 1995-2000 | |||||
| M43B18 | 1.8 l (1796 cm 3 ) | 84 mm × 81 mm | 2 | 9.7: 1 | 85 kW (115 hp) at 5500 | 168 Nm at 3900 | 1993-1999 |
| 74 kW (100 hp) at 5500 A | 142 Nm at 3900 A | 1995-1996 | |||||
| M43TUB19 UL | 1.9 l (1895 cm 3 ) | 85 mm × 83.5 mm | 2 | 9.7: 1 | 77 kW (105 hp) at 5300 | 165 Nm at 2500 | 1998-2002 |
| M43TUB19 OL | 87 kW (118 hp) at 5500 | 180 Nm at 3900 | 1998-2001 |
| Engine | Displacement | Power | Torque | Redline | Year |
|---|---|---|---|---|---|
| M43B16 | 1596 cc | 75 kW (105 hp) @ 5500 | 150 N·m (111 lb·ft) @ 3900 | 6200 | 1991 |
| M43B18 | 1796 cc | 85 kW (115 hp) @ 5500 | 168 N·m (124 lb·ft) @ 3900 | 6200 | 1993 |
| M43B19 | 1895 cc | 87 kW (118 hp) @ 5500 | 180 N·m (133 lb·ft) @ 3900 | 6200 | 1998 |
| 77 kW (105 hp) @ 5300 | 165 N·m (122 lb·ft) @ 2500 | 6200 | 1999 |
M43B16
The 1.6 L (1596cc) M43B16 produces 102 hp and 150 Nm. It uses the Bosch Motronic 1.7.1 fuel injection system.
Applications:
- 1993-1999 E36 316i
- 1994-1998 E36 316i Compact
- 1998-2002 E46 316i
M43B18
The M43B18 has a 1796 cc displacement. It produces 115 hp and 168 Nm and uses the Bosch Motronic 1.7.1 fuel injection system.
Applications:
- 1992-1998 E36 318i
- 1994-1996 E34 518i
- 1995-2001 E36 Z3 1.8
M43B19
The M43B19 (also known as the "M43TÜ") is the largest M43 engine, with a displacement of 1895 cc. It produces up to 118 hp and 180 Nm and uses BMW BMS 46 fuel injection system.
Applications:
- 87 kW (118 hp) and 180 N·m (133 lb·ft)
- 1998-2001 E46 318i/318Ci
- 2001-2003 BMW E36 Z3 1.9
- 77 kW (105 hp) and 165 N·m (122 lb·ft)
- 1999-2001 E36 316i compact
- 1999-2004 E46 316i
Technical
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BMW M43 Engine Technical details and specifications (1991-2002)
BMW Z3 (E36) 1.9L Years: (1998-2002)
No. of cylinders 4/OHC
Capacity 1895 cc
Compression ratio 9.7:1
Firing order 1-3-4-2
Diagnostic socket Yes
Suitable for unleaded petrol Yes
Ignition system Make Bosch
Fuel system Make Bosch
Thermostat opens 105 °C© Motor car History
Service
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BMW M43 Engine Service details (1991-2002)
BMW Z3 (E36) 1.9L Years: (1998-2002)
Spark plugs Original equipment Bosch Type FGR7DQP
Spark plugs Electrode gap Electrode gap 0.5 mm
Spark plugs Make NGK Type BKR6EQUP
Valve clearance -INLET Hydraulic
Valve clearance -EXHAUST Hydraulic
Engine oil grade - normal climate 0W/40SAE Synthetic or 5W/30 Synthetic
Engine oil grade - hot climate 5W/40SAE Synthetic
Engine oil grade - cold climate 0W/40SAE Synthetic
Engine oil with filter 4.0 litres
Manual gearbox oil 1.05 litres
Cooling system 6.0 litres
Brake fluid Type DOT 4
Power steering fluid Type Dexron II© Motor car History
Maintenance
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