Engine BMW M21D24

The 2.4-liter BMW M21 or M21D24 diesel engine was produced from 1983 to 1991 and was installed on the concern’s popular models: 3-Series in the back of the E30 and 5-Series in the back of the E28 and E34. This unit was offered both in an atmospheric version and in a turbocharged version.

The engine was installed on:

  • BMW 3-Series E30 in 1985 – 1991;
  • BMW 5-Series E28 in 1983 – 1987; 5-Series E34 in 1988 – 1991;
  • Lincoln Continental Mark VII in 1984 – 1985.

Specifications

Production years 1983-1991
Displacement, cc 2443
Fuel system vortex chamber
Power output, hp 86 (M21D24 or M21D24S)
115 (M21D24 Turbo or M21D24T)
Torque output, Nm 152 (M21D24S)
210 – 220 (M21D24T)
Cylinder block cast iron R6
Block head aluminum 12v
Cylinder bore, mm 80
Piston stroke, mm 81
Compression ratio 22.0
Features no
Hydraulic lifters no
Timing drive belt
Phase regulator no
Turbocharging no (M21D24S)
Garrett T3 (M21D24T)
Recommended engine oil 5W-40
Engine oil capacity, liter 5.5 (M21D24S)
5.75 (M21D24T)
Fuel type diesel
Euro standards EURO 0
Fuel consumption, L/100 km (for BMW 524td 1986)
— city
— highway
— combined
9.5
5.8
7.1
Engine lifespan, km ~350 000

Disadvantages of the M21D24 engine

  • This diesel engine does not tolerate prolonged overheating, cylinder head cracks appear;
  • The engine does not start when the glow plug control unit fails;
  • Often, the oil supply hoses to the radiator crack and the lubricant pressure drops;
  • Monitor the condition of the timing belt, it stretches, jumps and the phases go astray;
  • Sometimes there are involuntary starter engagements while driving in traffic jams.

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