BMW M43B19 Engine Problems, Specs And Reliability

M43, an inline-four engine with a SOHC piston, was first released by BMW in 1991 as a substitute for M40 and manufactured until 2002. The available engine volume is between 1.6 L, and 1.9 L. M43 was employed for base-model vehicles. Simultaneously, DOHC M42, and later M44, was utilized for high-performance automobiles.

M43B19 (or M43TU as it’s often called) is the biggest engine of the M43 series, with an offset of 1985 cc. Using BMW BMS 46 fuel injection system, it reaches a power of 118 hp and a torque of 180 Nm.

Unlike a motor utilized for 316i cars without a DISA valve, the 318i model features one.

M43B19 Engine Specs

ManufacturerSteyr Plant
Also calledBMW M43TU
Production1998-2002
Cylinder block alloyCast iron
ConfigurationStraight-4
ValvetrainSOHC
2 valves per cylinder
Piston stroke, mm (inch)83.5 (3.29)
Cylinder bore, mm (inch)85 (3.35)
Compression ratio9.7
Displacement1895 cc (115.6 cu in)
Power output (horsepower)77 kW (105 HP) at 5,300 rpm
87 kW (118 HP) at 5,500 rpm
Torque output165 Nm (122 lb·ft) at 2,500 rpm
180 Nm (133 lb·ft) at 3,900 rpm
Redline6,200 rpm
HP per liter55.4
62.3
Fuel typeGasoline
Fuel systemBosch BMS46
Weight, kg (lbs)~138 (305)
Fuel consumption, L/100 km (mpg)
-City
-Highway
-Combined
for E46 318Ci
11.0 (21.4)
6.0 (39.2)
8.0 (29.4)
TurbochargerNaturally aspirated
Oil consumption, L/1000 km
(qt. per miles)
up to 1.0
(1 qt. per 750 miles)
Recommended engine oil0W-30, 0W-40, 5W-30, 5W-40
Engine Oil Capacity, L (qt.)4.0 (4.2)
Oil change interval, km (miles)7,000-10,000
(4,500-6,000)
Normal engine operating temperature, °C (F)90-95 (195-203)
Engine lifespan, km (miles)
-Official information
-Real

300+ (185)
Tuning, HP
-Max HP
-No life span loss
150+

The M43TU 1.9L engine requires 4.1 US Quarts (4 Liters) of new SAE 5W-30 oil for an oil change with a new oil filter.

M43 Engine Modifications

  1. M43TU B19 OL (1998-2002) is a basic model with an output of 118 hp at 5,500 rpm and a torque of 180 Nm at 3,900 rpm.
  2. M43TU B19 UL (1998-2001) is a later modification with another camshaft. Its power is 105 hp at 5,300 rpm and a torque of 165 Nm at 2,500 rpm.

M43B19 Applications

  • BMW 316i E36
  • BMW 316i E46
  • BMW 318Ci E46
  • BMW Z3

M43TU Engine Innovations

  • Single engine displacement – 1.9 liters;
  • An engine block with the fastening points for the balancer shaft housing;
  • Cylinder block with an assembly of the engine speed sensor assembly and the reference signal sensor;
  • The crankshaft with the driving gear to the balancer shafts and an incremental wheel speed sensor and the engine speed reference signal transmitter;
  • Block of balancer shafts;
  • Modified camshaft of the lower power stage of the motor;
  • The pistons and connecting rods;
  • The oil pan, the oil damper, and suction tube oil pipe are fitted under the engine with balance shafts;
  • Thermal oil level sensor;

BMW M43B19 Engine Problems And Reliability

  1. Oil leak. The trouble is rather widespread for these motors. As a rule, the cause is the leaking of the valve cover. Therefore, acquiring a fresh valve cover gland, sealant, and positive crankcase ventilation valve is advisable.
  2. Engine tapping. Usually, it has to do with the DISA valve. Therefore, it’s recommended to acquire DISA valve repair kit and fix the intake manifold.

The other possible reason is hydraulic lifters tapping.

Besides, the M40B19 motor may have malfunctions with acceleration, rough idling, and overheating.

If you are experiencing overheating, you should inspect the pump, radiator, thermostat, and cooling system for air pockets. When the engine does not start, check the spark plugs, the gas pump, the ignition coil and high-voltage wires.

Though, all these troubles are secondary compared to the major minus of the motor, which is low power. So, the fans of speedy driving will hardly like this engine as the driving may be pretty boring.

In a nutshell, despite its low capacity, BMW M43 is rather a trustworthy and durable engine. However, all M43 motors for sale are rather old now, so, you can face some unpleasant surprises.

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