Oil Circuit - Triumph Rocket III Classic Service Manual

Oil Circuit
General Description
The Rocket III utilises a dry sump lubrication system
whereby a pressure pump takes oil from an oil tank and
delivers oil under pressure to the engine and transmission.
A scavenge pump collects oil from the sump and returns
it to the oil tank.
The oil tank is attached to the upper crankcase on the left
hand side of the motorcycle. Situated within the lower
crankcase, the pressure pump is gravity fed from the oil
tank via an internal drilling. An oil tank drain plug is
situated at the lowest point in . the drilling, in the sump
itself.
Scavenge System
Pick-ups from the double-ended scavenge pump collect
oil from the front and rear of the sump and return it to the
oil tank. Further drain plugs are fitted to the front and rear
of the sump to drain residual oil from the sump.
Pressure System
From the pressure pump, the oil is delivered along an
internal passage, past the oil pressure relief valve. The oil
pressure relief valve relieves excess oil pressure by
allowing oil to return to the sump. Once past the oil
pressure relief valve, the pressurised oil goes through a
one-way valve whose purpose is to prevent the oil in the
tank from draining into the lower crankcase area.
From the one-way valve, the oil is passed through the oil
filter. Filtered oil is fed directly to the main oil gallery for
distribution. Drillings from the main oil gallery feed oil to
the four crankshaft main bearings. There are also three
piston oil jets, located in the main bearing housings which
lubricate and cool the pistons.
Oil is also fed from the main oil gallery, through internal
drillings and pipes, to the transmission. The transmission
input shaft is both drilled through its entire length and
cross-drilled. The cross drillings provide oil directly to the
gears, selector forks and bearings. Oil flowing through the
centre of the shaft exits at the clutch end, to provide oil to
the clutch assembly. A spray jet for the outside of the
clutch is mounted directly to the pressure pump. The
torsional damper shaft is also fed from the input shaft. The
torsional damper shaft is cross-drilled to feed the gears,
bushes and other running surfaces. An internal
passageway carries oil to the output shaft bearing and
then on to the output shaft. The output shaft is also cross-
drilled to carry oil to the gears, selector forks and bearings.
The cylinder head is fed via an internal drilling coming
from number 4 main bearing. Within the cylinder head, a
passageway through the camshaft ladder feeds oil to the
camshaft bearings, and spills oil onto the tappet buckets
Lubrication
and the valves. Spill oil returns via the camshaft drive
chain area to the sump, lubricating the camshaft drive
chain in the process. Also located off the cylinder head
supply is an oil jet which cools the alternator. The low oil
pressure warning switch is located at the rear of the
cylinder head.
SelVice Manual- Rocket Ill/ Classic / Touring
9.S