BMW M50B24TU

BMW M50B24TUThe BMW M50B24TU is a 2.4 liters (2,394 cc, 146.1 cu·in) straight-six, four-stroke cycle natural aspirated gasoline engine from BMW M50-family. The engine was manufactured from 1992 to 1996 and used in the Thailand and Oceania markets. This engine is based on the M50B25TU with the stroke reduced to 72 mm (2.83 in).

The BMW M50B24TU engine features a cast-iron block and aluminum head with a dual overhead camshaft (DOHC) and four valves per cylinder (24 in total). The engine is equipped with an electronic fuel injection system (DME M3.3.1), VANOS (Variable Valve Timing System from BMW) for inlet camshaft, coil-on-plug ignition system, a knock sensor, and a lightweight plastic intake manifold.

The engine has an 84.0 mm (3.31 in) cylinder bore and 72.0 mm (2.83 in) piston stroke. This engine has a compression ratio rating of 10.5:1 and a redline of 6,500 rpm. The BMW M50B24TU engine produced 188 PS (138 KW; 185 HP) at 5,900 rpm of maximum output power and 240 Nm (24.5 kg·m; 177.1 ft·lb) at 4,200 rpm of peak torque.

The breakdown of the engine code is as follows:

  • M50 – Engine Family
  • B – Gasoline
  • 24 – 2.4 Liter Displacement
  • TU – Technical Update

General information

Engine Specifications
Engine codeM50B24 TU
LayoutFour stroke, Inline-6 (Straight-6)
Fuel typeGasoline
Production1992-1996
Displacement2.4 L, 2,394 cc (146.1 cu in)
Fuel systemElectronic fuel injection (MS40.1)
Power adderNone
Max. horsepower188 PS (138 KW; 185 HP) at 5,900 rpm
Max. torque240 Nm (24.5 kg·m; 177.1 ft·lb) at 4,200 rpm
Firing order1-5-3-6-2-4
Dimensions (L x H x W):
Weight194 kg (428 lbs)

Cylinder block

The BMW M50B24TU engine has a cast-iron cylinder block, bore is 84.0 mm (3.31 in) and stroke is 72.0 mm (2.83 in). The compression ratio rating of 10.5:1. The pistons are each fitted with two compression rings and a single oil ring.

Cylinder block
Cylinder block alloyCast-iron
Compression ratio:10.5:1
Cylinder bore:84.0 mm (3.31 in)
Piston stroke:72.0 mm (2.83 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:7
Cylinder inner diameter (standard):84.000-84.014 mm (3.3071-3.3076 in)
Piston skirt diameter (standard):83.980 mm (3.3063 in)
Piston ring side clearance:Top0.020-0.060 mm (0.0008-0.0024 in)
Second0.030-0.065 mm (0.0012-0.0026 in)
Oil
Piston ring end gap:Top0.200-0.400 mm (0.0079-0.0157 in)
Second0.200-0.400 mm (0.0079-0.0157 in)
Oil0.400-1.400 mm (0.0157-0.0551 in)
Crankshaft journal diameter:60.000 mm (2.3622 in)
Crankpin diameter:45.000 mm (1.7717 in)

Main bearing cap bolts tightening procedure and torque specs:

  • Step 1: 20 Nm; 2.04 kg·m; 14.76 ft·lb
  • Step 2: Tighten bolts at the angle of 50°

After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.

Connecting rod bearing bolts

  • Step 1: 5 Nm; 0.51 kg·m; 3.69 ft·lb
  • Step 2: 20 Nm; 2.04 kg·m; 14.76 ft·lb
  • Step 3: Tighten bolts at the angle of 70°

Cylinder head

The cylinder head is made of an aluminum alloy with good cooling efficiency. The engine has a dual overhead camshaft with four valves per cylinder. Intake valves are 33.0 mm (1.30 in)) in diameter and exhaust valves are 30.5 mm (1.20 in). Specifications of M50B24TU camshafts are as follows: duration is 228° for inlet and 228° for exhaust valves, valve lift is 9.0 and 9.0 mm, respectively. This motor is equipped with hydraulic lifters.

Cylinder head
Valve Arrangement:DOHC, chain drive
Valves:24 (4 valves per cylinder)
Intake/Exhaust duration:228°/228°
Valve head diameter:INTAKE33.000 mm (1.2992 in)
EXHAUST30.500 mm (1.2008 in)
Valve steam diameter:INTAKE6.000 mm (0.2362 in)
EXHAUST6.000 mm (0.2362 in)

Head tightening procedure and torque specs:

  • Step 1: 30 Nm (3.06 kg·m; 22.14 ft·lb)
  • Step 2: Tighten bolts at the angle of 90°
  • Step 3: Once again, tighten bolts at the angle of 90°

Maintenance data

Compression pressure
Standard10.2 kg/cm2 (9.9 bar, 145 psi) / 350 rpm
Oil system
Recommended engine oil 5W-30, 5W-40, 10W-30, 10W-40
Oil type API
Engine oil capacity (Refill capacity) With filter change: 5.75 L (6.08 US. qt, 5.06 Imp. qt.)
Oil change interval, km (miles)10,000 (6,000)
Ignition system
Spark plugBosch: FGR7DQP, NGK: BKR6EQUP
Spark plug gap0.7 mm (0.028 in)

Vehicle applications

ModelYears Produced
BMW 325iA/2.4 (E36)1993-1995
BMW 525iA/2.4 (E34)1992-1996
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

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