The M43B18 engine is an in-line 4-cylinder engine of the M43 family (it also included the M43B16 and M43B19), which was released in 1992 as a replacement for the M40B18. The M43 cylinder block was transferred from the M40 practically unchanged, the crankshaft now has 4 counterweights (there were 8 on the M40) and lost a little in weight, the stroke remained unchanged.
In addition to the crankshaft, the pistons have also changed, the compression ratio has increased to 9.7. The cylinder head has changed significantly under the timing chain drive (there was a belt). One camshaft (SOHC 8V), rockers changed, valves lightened.
Valve diameters have not changed: inlet 42 mm, outlet 36 mm. Characteristics of the standard camshaft M43B18: phase 244/244, rise 10.6/10 mm. A variable-length DISA intake manifold has also been adopted, which allows for more torque at both low and high revs. The ignition system has also been changed.
M43 family: M43B16, M43B18, M43B19, M43TU.
Specifications
| Production years | 1992-2001 Steyr Plant |
| Displacement, cc | 1796 |
| Fuel system | injector |
| Power output, hp | 115 /5500 rpm |
| Torque output, Nm | 168 /3900 rpm |
| Cylinder block | cast iron R4 |
| Block head | aluminum 8v |
| Cylinder bore, mm | 84 |
| Piston stroke, mm | 81 |
| Compression ratio | 9.7 |
| Features | DISA |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 4.0 |
| Fuel type | petrol |
| Euro standards | EURO 2/3 |
| Fuel consumption, L/100 km (for 318i E36) — city — highway — combined |
11.0 6.2 7.9 |
| Engine lifespan, km | ~320 000 |
| Weight, kg | 133 |
The engine was installed on:
- BMW E36 318i in 1992 – 1998;
- BMW E34 518i in 1994 – 1996;
- BMW E36 Z3 in 1995 – 2001.
Disadvantages of the M43B18 engine
The problems of the M43B18 engine are the appearance of noise, oil leaks, dips during acceleration, and intermittent motor operation.
When the oil is quickly consumed, a leak is observed, check the valve cover. To eliminate the leak, it is enough to replace the crankcase ventilation valve or gasket with sealant.
Among the problems in the operation of the power unit, unstable speed is noted that occurs when the air duct is damaged. Air leaks are possible, you should also inspect the lambda probe, idle valve, throttle valve, mass air flow sensor. The reason may be problematic camshaft rotation.
Dips when picking up speed cause dirty injectors, it is enough to clean them.
The cause of overheating is the failure of the pump, radiator, thermostat. Also check the cooling system for air pockets, which are eliminated by blowing. If the engine will not start, inspect the spark plugs, the gas pump, the ignition coil, and the wires.
Frequently asked questions about the BMW M43B18
How much power does the BMW M43B18 make?
Power output of the BMW M43B18, hp: 115 /5500 rpm. Torque, Nm: 168 /3900 rpm.
How much oil does the BMW M43B18 take and which one?
Engine oil capacity: 4.0 liters. Recommended oil: 5W-30.
Does the BMW M43B18 have a timing belt or chain?
The BMW M43B18 uses a timing chain.
Is the BMW M43B18 turbocharged?
No, the BMW M43B18 is naturally aspirated.
Does the BMW M43B18 need valve clearance adjustment?
No, the BMW M43B18 has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the BMW M43B18 last?
The typical lifespan of the BMW M43B18 is ~320 000 km with proper maintenance.
What is the fuel consumption of the BMW M43B18?
318i E36: city 11.0, highway 6.2, combined 7.9 L/100 km.
What cars was the BMW M43B18 installed on?
BMW E36 318i in 1992 - 1998; BMW E34 518i in 1994 - 1996; BMW E36 Z3 in 1995 - 2001.
