Indian Motorcycle 2003 Chief Vintage, Service Manual

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Figure 555 — POWERPLUS™ 100 engine lubrication system
In the POWERPLUS
™
100 engine lubrication system, the
pump draws oil from the tank and supplies the oil to the
engine through two of three pressure ports. Oil is
pumped from the first pressure port through the tappet
screen, the valve lifters and pushrods to the top of the
engine for lubrication of the rocker assemblies and
valves. The oil then drains from the rocker boxes
through the pushrod tubes to the cam gearcase.
From the second pressure port, oil is pumped through
channels in the gearcase and cam cover to provide
lubricating oil to the pinion shaft, bushing, crankshaft
bearings, connecting rods and pistons. Pressure created
within the crankcase on piston downstroke then forces
oil from the crankcase into the breather valve.
From the breather valve, the oil is sprayed into the cam
gearcase to lubricate the cam and pinion gears. Oil
accumulating at the bottom of the cam gearcase is
picked up by the pump and returned through the filter
to the oil tank.
Any excess oil pressure within the oil pump is released
through the third pressure port for return to the oil tank.