Engine BMW M40B16

The BMW M40B16 engine – a low-volume in-line 4-cylinder engine of the BMW M40 series, was released in 1988 and was developed on the basis of the M40B18, in which a crankshaft with a smaller stroke and other pistons were installed, the connecting rods remained the same.

M40 1.6 differ from 1.8 and the intake manifold, throttle valve, spark plugs and ECU. The cylinder head has not changed, still the same 8-valve single camshaft (SOHC), with hydraulic valve clearance compensators. The diameter of the intake valves is 42 mm, exhaust 36 mm. Characteristics of the M40 camshafts: phase 244/244 rise 10.6/10.6 mm.

The timing belt drive, the belt itself is not very reliable and does not have the proper width, as a result of which it has a low resource. On average, the replacement of the timing belt and roller on the M40 is required every ~ 40 thousand km, otherwise, if it breaks, the engine bends the valve.

This motor was used on BMW cars with the 16i index.


Production years 1988-1994 Steyr Plant
Displacement, cc 1596
Fuel system injector
Power output, hp 100 /5500 rpm
102 /5500 rpm
Torque output, Nm 141 /4250 rpm
143 /4250 rpm
Cylinder block cast iron R4
Block head aluminum 8v
Cylinder bore, mm 84
Piston stroke, mm 72
Compression ratio 9.0
Features no
Hydraulic lifters yes
Timing drive belt
Phase regulator no
Turbocharging no
Recommended engine oil 5W-30
Engine oil capacity, liter 4.0
Fuel type petrol
Euro standards EURO 1
Fuel consumption, L/100 km
— city
— highway
— combined
Engine lifespan, km ~275 000
Weight, kg ~132

Disadvantages of the M40B16 engine

  • The most famous engine problem in the accelerated development of the camshaft cams;
  • The timing belt with a roller needs to be replaced every 40,000 km; if it breaks, the valves bend;
  • The nozzles here get dirty quickly, the engine starts to blunt, traction dips appear;
  • The reason for floating speed is usually air leakage, throttle contamination, idle valve;
  • Due to the wear of plastic flanges, the level of antifreeze drops and the engine overheats.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top