Harley Davidson 2016 Dyna Models. Service manual — page 14

OIL RETURN
Two illustrations accompany this explanation.

Cam support plate oil flow is shown in Figure 3-1.

Bottom end oil flow is shown in Figure 3-3.

The "dual kidney" designation given to the oil pump refers to its two scavenging functions, whereby it simultaneously draws oil from both the cam and flywheel compartments.

Oil sucked up by the scavenge lobes passes through the scavenge gerotors of the oil pump and is directed through a return channel in the cam support plate (A40). See 3.5 OIL PUMP OPERATION.

Exiting a hole on the inboard side of the cam support plate.the oil enters the upper hole in the crankcase flange (B41).
The oil flows through the upper passageway in the crankcase (A42), enters a passageway at the front of the transmission housing and empties into the oil pan at the front of the baffle (Q43, R44).

The oil flows to the rear of the oil pan along each side of the baffle. Spring tension holds the unit tight against the bottom of the pan to prevent oil from entering or escaping around the perimeter of the baffle. At the back of the oil pan, the oil enters the open side of the baffle where it is redirected for-ward. The baffle plates slow the circulation of the oil through the pan to enhance cooling.

Oil pickup occurs in the front compartment of the baffle where a passageway in the casting (S46) directs the flow upward. Passing through a second passageway in the trans-mission housing (Q47), the flow of oil enters the lower passageway in the crankcase (A1) to repeat the circuit.