Patent ID: 7198021

Claim:
A powertrain assembly comprising an engine and a transmission, said engine comprising: a crankcase with a crankshaft rotatably supported therein; an oil pan installed below the crankcase; and an oil pump for circulating a lubricating oil from the oil pan through the engine; wherein said transmission is provided for receiving rotary torque, rotating at an engine speed from said crankshaft at a main transmission shaft, changing it to modified rotary torque rotating at a different speed, and delivering the modified rotary torque outwardly via a transmission countershaft; wherein the transmission comprises a modular cartridge transmission which is attachable to and detachable from a transmission attachment face comprising a side face of the crankcase with a major part of the transmission fitting inside of the crankcase; and further wherein the oil pump and the transmission attachment face are arranged in substantially non-overlapping relation when viewed from the side of the engine.