Fig. 74.—“Illinois” Oiling Diagram
The table calls for four lubricants, these being sewing machine oil, which is very thin and liquid; gas engine cylinder oil; transmission oil, which is as thick as molasses; and cup grease, which is like butter.
The engine is oiled automatically, the only requirements being to keep the oil tank filled, and to be sure that the oiler is working. The other parts of the tractor are oiled or greased by hand.
[Figure 74] is the oiling chart of the Illinois tractor.
There are three systems used for engine lubrication: splash, force feed, and by a mechanical oiler. In the splash system, a pool of oil is maintained in the crank case, of such a depth that the ends of the connecting rods just dip into it. They strike it with sufficient force to splash it to all parts of the crank case, the oil that strikes the pistons being carried up into the cylinders and lubricating the walls.
The end of the connecting rod is often fitted with a dipper, as shown in [Figure 75], to strike into the oil, as well as an oil catcher, shown in the same drawing, which is a little trough that catches the splashing oil and guides it to the connecting rod bearing.
Fig. 75.—End of “Twin City” Connecting Rod
To oil the wrist pin bearing there is an oil groove around the piston that collects oil from the cylinder walls; a hole connects this groove with the hollow wrist pin, from which other oil holes lead to the bearing. This is shown in [Figure 76].
