Abstract: A balancer shaft is disposed parallel to a crankshaft, and rotated at the same speed as the crankshaft. An oil pump is provided below the balancer shaft and is driven by the balancer shaft. Oil passages are provided for supplying oil from the oil pump passing through a passage formed in the balancer shaft. The oil is ejected to a big end of a connecting rod.

Abstract: A system for braking an engine is provided with a brake drum in the form of an annular projection formed on a side of a flywheel secured to a crankshaft of the engine. A pair of brake shoes are provided inside of the brake drum, and an end of each brake shoe is rotatably supported on a supporting plate. A spring is provided between the brake shoes to contract the shoes. A cam is rotatably provided on the supporting plate to be engaged with the other end of each brake shoe. A lever is connected to the cam and a spring is provided to urge the lever in the direction to expand the brake shoes. The lever is held by a brake operating device in the contracting state of the brake shoes.