The drop-forged camshaft with hardened bearing surfaces and cams is supported by 3 alloy bearings in the crankcase. Axial movement is controlled by the front camshaft bearing which together with the 2nd camshaft bearing is of a split design. Each cylinder features an overhead exhaust and inlet valve opened and closed by the camshaft by means of mechanical lifters, pushrods and rocker arms. The fuel lift pump, mounted on the injection pump, draws fuel from the tank. It incorporates a hand primer pump that is used the bleed the fuel lines of air.
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.