Fuel is delivered to the injection pump after passing through a filter. Depending on application, the injection pump is fitted with a pneumatic or centrifugal governor that controls the amount of fuel injected according to engine load. Certain versions feature an automatic timing device that advances the timing of the pump with increasing engine speed. Engine lubrication is provided by an oil pump driven by the camshaft. Oil is drawn from the sump and directed into the main oil gallery after being filtered by a fine mesh strainer or cartridge-type filter.
Oil is fed to the crankshaft and camshaft bearings via small bores.
From the front camshaft bearing, oil continues to the rocker shaft pedestals and cylinder head through external oil lines. The rocker arm bearings and pushrods are lubricated by oil flowing through hollow rocker shafts. Cylinder bores, piston pins and timing gears are splash-lubricated. Two pressure relief valves are fitted to the oil circuit. The main circuit features a relief valve that opens at 8 bar, protecting the engine against excessive oil pressure.