Camshaft Drive

In 2-cycle engine operation the camshaft rotates at the same speed as the crankshaft.

The camshaft drive gears are located at the power takeoff end of the engine. They transmit the rotation of the crankshaft to the camshaft.

It is necessary to maintain a fixed relationship between the rotation of the crankshaft and the rotation of the camshaft so that crankshaft gear.

Steel-backed babbitt-lined bearing shells support the inner and outer hubs of the
forged steel helical idler gears.

The inner and outer supports are bolted and doweled together before being mounted
in the camshaft drive housing.

The fuel oil pump and governor are driven from a gear that meshes with the lower idler gear.
A pair of bevel gears drives the vertical governor shaft which is mounted in ball bearings.

The lower idler gear also drives the quill shaft gear, which is splined for the quill shaft that drives the blower and accessory gear trains.

A splined coupling, which rotates in the babbitt-lined center bearing, joins the two sections of the quill shaft.

The overspeed trip weight assembly and the camshaft gear are bolted and doweled
to a hub that also serves as a bearingjournal for this assembly.

The hub is splined to fit on the end of the camshaft.

Lubricating oil for the camshaft drive gear train and bearings is piped from the
end of the lubricating oil manifold in the cylinder block.

Oil is supplied under pressure to the hollow camshaft through the camshaft gear bearing.
Open jets spray oil on the gear teeth.

Complete dynamic balance of the engine is obtained by balance weights mounted
in a certain relation to each other on the gears in the front and rear gear trains.