The photograph below shows the areas drained by the several drain plugs.
Inside the
orange circle is the (gearbox) drain plug for the left oil screen. The location of this plug on the side of the gearbox allows you to drain most of the gearbox oil with the least mess. Inside the
green circle is the hole for the magnetic drain plug. This drain plug is located directly beneath the transmission, and is ideally located to collect fine metal contaminants shed by the gears. It is separated by a low, vertical baffle which helps to keep metal contaminants near the magnet. Remove the magnetic plug to drain the remaining oil from the gearbox.
The left oil pump draws oil from the crankcase sump via the oil screen port located inside the
blue circle. The oil screen traverses the engine from this port, and the drain plug for this oil screen is located on the right side of the engine. This oil plug drains the crankcase sump of the engine.
The oil filter chamber is located inside the
black oval. The oil filter traverses the engine, and the oil filter cap is located on the right side of the engine. Removing the oil filter cap drains the oil from this chamber and the oil journals which lubricate the crankshaft, piston, and cylinder head.
The
purple circle shows the oil journal which travels through the crankshaft. The crankshaft is fed oil from an oil journal located inside the right crankcase cover. This oil journal lubricates the contact area between the crankshaft and the connecting rod. The
red circle shows oil ports in the upper connecting rod which lubricate the piston pin.
It is important to inspect the oil seal in the right crankcase cover which forms the seal with the end of the crankshaft. If this seal is damaged it must be replaced, since it maintains oil pressure for this important lubrication passage.
