Oiling System - Buell 2003XB9S Service Manual

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OILING SYSTEM

GENERAL
1. Oil is gravity-fed from the oil reservoir to the gerotor-style
oil pump through a feed hose. Oil enters the feed section
and fills a cavity located under the feed pump.
NOTE
See 3.13 OIL PUMP for a complete explanation of the gerotor
pump sets.
2. The feed pump transfers oil from the inlet cavity through
the external steel line to the oil cooler.
3. From the oil cooler oil flows to the oil filter mount.
4. Through the filter mount cavity oil flows to the oil filter.
5. Oil enters the peripheral cavity of the oil filter, passes
through the filtering medium into the central cavity of the
oil filter, and flows into the filter adapter (fitting which
connects filter to filter mount).
6. Adequate oil pressure in the filter mount cavity activates
the oil pressure signal light switch and shuts off the oil
pressure signal light.
7. Oil flowing from the filter adapter opens the check ball.
The check ball opens at 4-6 psi (28-41 kPa) oil pressure.
8. With the check ball open, oil flows into the crankcase
feed galley.
9. Oil enters an intersecting passage in the gearcase cover
and flow is then routed to the pinion bushing.
10. Oil enters a hole in the end of the pinion gear shaft and
travels to the right flywheel where it is routed through the
flywheel to the crankpin. Oil is forced through the crank-
pin to properly lubricate the rod bearing assembly.
3-78 2003 Buell XB9S: Engine
11. Oil flow then continues through the gearcase cover to the
main feed galley at the top of the gearcase cover. Drilled
passages in the crankcase intersect the main feed galley
and carry oil to all hydraulic lifters and piston jets.
12. Oil flows up passages in the push rods to the rocker arm
shafts and bushings.
13. The valve stems are lubricated by oil supplied through
drilled oil holes in the rocker arms.
14. Oil collected in the push rod areas of the cylinder heads
flows down the push rod cover, through drain holes in the
tappet blocks and into the gearcase. After providing lubri-
cation to the gearcase components oil returns to the
scavenge section of the oil pump through a passage
located in the top of the pump. Oil is then returned to the
oil tank.
15. Feed oil to the rocker area is returned to the crankcase
through a passage in the head and cylinder.
16. Oil collected in the sump is splash-fed to the pistons, cyl-
inder walls and flywheel components.
17. A pair of piston oil jets cools the bottom of the piston with
a spray of oil.
18. Oil collected in the sump area returns to the scavenge
section of the oil pump through a passage located in the
rear section of the sump. Oil flow to the pump is accom-
plished by the scavenging effect of the pump and by the
pressure created by the downward stroke of the pistons.
19. Return oil fills a cavity above the pump's return gears.
The return gears pump oil back to the oil reservoir.
3.12