The M43B19TU engine, also known as the M43TUB19, was an inline four-cylinder engine developed by BMW for mid-range models. Depending on the version (UL or OL) it offered different power output and slightly different life. The main advantage of the engine is its simple design and reliability.
Characteristics of the M43B19 engine
| Characteristics | M43B19TU (UL) | M43B19TU (OL) |
|---|---|---|
| Exact volume, cm³ | 1895 | 1895 |
| Power system | Injector | Injector |
| Power, hp | 105 | 118 |
| Torque, Nm | 165 | 180 |
| Cylinder block | Cast iron R4 | Cast Iron R4 |
| Cylinder head | Aluminum 8v | Aluminum 8v |
| Cylinder diameter, mm | 85 | 85 |
| Piston stroke, mm | 83.5 | 83.5 |
| Compression ratio | 9.7 | 9.7 |
| IBC Features | DISA | DISA |
| Hydrocompensators | Yes | Yes |
| Transmission timing | Chain | Chain |
| Fasoregulator | No | No |
| Turbocharger | No | No |
| Oil volume, liters | 4.0 | 4.0 |
| Oil type | 5W-30 | 5W-30 |
| Environmental class | Euro 2/3 | Euro 2/3 |
| Example resource, thousand km | ~350 | ~340 |
| Engine weight, kg | 138 | 138 |
Engine Application
The M43B19TU engine was installed in the following BMW models:
- BMW 316i E36
- BMW 316i E46
- BMW 318Ci E46
- BMW Z3
Engine construction and repair
Appeared in 1998, the M43B19 engine, which was also called M43TU, was a modified version of the M43B18/M43B16, in which the cylinder block was modified for balancer shafts. In addition, the cylinder block was bored for 85 mm pistons (it was 84 mm), the crankshaft was used with increased to 83.5 mm (it was 81 mm) piston stroke. The pistons and connecting rods are also changed.
There are no major changes in the cylinder head, but the camshaft has been changed on the weak version. The DISA intake manifold is now plastic. The engine management system is now Bosch BMS 46.
This motor was used on BMW cars with the index 16i and 18i.
Concurrently with this engine, BMW produced a related model with a 16V MGB, the M44B19.
M43B19, released in 2001, was replaced by a new motor N42B20, with a working volume of 2 liters.
Modifications of the BMW M43B19 engine
- M43B19 OL (1998 – 2002) – basic variation of the engine with an output of 118 hp at 5500 rpm, torque 180 Nm at 3900 rpm.
- M43B19 UL (1998 – 2001) – weak version with a different camshaft. Power 105 hp at 5300 rpm, torque 165 Nm at 2500 rpm.
Disadvantages, breakdowns and problems of the M43 engine
Although the M43B19TU engine has proven to be reliable and durable, it has a number of typical problems:
- Low power characteristics.
The engine is designed for economical and quiet driving, so its power is insufficient for dynamic driving. - DISA system problems.
The DISA variable intake manifold geometry system can fail, as evidenced by crackling and noise when the engine is running. - Oil leak.
Most often, oil leaks from under the valve cover due to gasket wear. - Clogging of the crankcase gas recirculation valve.
The valve is clogged, and also burst antifreeze supply pipes, which requires replacement. - Wear of the camshaft and hydrocompensators.
The use of cheap or unsuitable oil leads to accelerated wear of the camshaft and noise of the hydraulic compensators.
MOTOR RATING: 4