Two illustrations accompany this explanation.
• Cam support plate oil flow is shown in Figure 3-1.
• Top end oil flow is shown in Figure 3-2.
Oil passes through a channel in the cam support plate. It exits on the crankcase side through two holes near the top (A11, A12). Oil enters two holes in the crankcase flange (B13, B14).
One passage leads to the front cylinder and the other to the rear cylinder. Oil then travels through passageways in the crankcase to the hydraulic lifter bores (D15).
Oil enters each lifter bore through oblong holes (E16), flows around the lifter and enters a hole at the side of the lifter body.
As the chamber inside the lifter body is filled, the pushrod socket rises to eliminate lash of the valve train components.
Oil then exits a hole centered in the lifter socket and flows up the hollow pushrods.
NOTE
An additional round hole (E17) drilled into the lifter bores feed oil to the piston jets.
Exiting holes at the top of the pushrods, oil enters the rocker arms lubricating the rocker arm bushings. Oil flows along the rocker arm shafts and exits a pin hole in the outboard side of each rocker arm (F18). This oil lubricates the valve springs and the top of the valve stem.
Oil runs to the low side of the rocker housing and enters the exhaust valve spring pocket. A drain hole (G19) leads to a passageway in the cylinder head casting.
Oil exits the bottom of the cylinder head and passes through a dowel pin (H20) on the cylinder flange. Oil flows through a vertical passageway in the cylinder. It then passes through a second dowel pin on the cylinder deck (I21) and enters the left crankcase half.
Flowing through a horizontal passageway in the left crankcase half (J22), oil runs through a third dowel pin (K23) to the right crankcase half. Finally it travels through another passageway before emptying into the cam compartment (B23, B24).
Oil collecting in the cam compartment is picked up by one of two scavenge lobes on the oil pump (B25).
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