Engine M40 models 316i produced since September 1988 318i produced since September 1987. (BMW 3 Series E30)

Since the newly developed M40 engine differs from the previous M10 engine primarily in the work on removing the cylinder head, these works are combined in a special section in this book. All other sections ("Lubrication system, cooling system, power supply system etc.") also apply to the M40 engine, which began to be installed in September 1987. (on the 316i model from September 1988 and on the 318i model from September 1987.).

The design of the new M40 engine is similar to the previous four-cylinder engine (M10). The most important innovation is the timing drive, which is implemented here by a toothed belt. In addition, hydraulic compensation of valve clearances began to be used.

The camshaft controls the valves via rocker arms supported by hydraulic valve clearance compensators. This allows for automatic compensation of valve clearances, eliminating the need for adjustment. The exhaust valves are filled with sodium to increase wear resistance. The camshaft is mounted in 5 separable bearings. The camshaft is driven from the crankshaft via a toothed belt.

The lubrication system is supplied by a Duocentric oil pump located in the timing gear housing cover and driven directly by the crankshaft.

The fuel system is based on a Motronic fuel injection device (see section "Fuel injection device").



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