Engine Oil Circuit Description; Heat Exchanger - Triumph 2012 Tiger 800 Service Manual

Engine Oil Circuit Description

Oil is collected from the sump and is drawn through a mesh strainer into the oil pump rotor. The oil pump is fitted with a
single pumping rotor which supplies pressurised oil to the lubrication circuit via the oil pressure relief valve. The relief
valve is set to open at 5.1 bar (75 lb/in2) and when open, returns high pressure oil direct to the sump.
Pressurised oil is delivered to the oil to water heat exchanger <mounted on the front of the engine), where it is cooled.
The cooled oil is then delivered to the outside rim of the oil filter, where it is filtered by passing th rough the filter
membrane. Filtered oil is then fed into the lower crankcase gallery. From here it is distributed around the engine:
Oil is delivered to the crankshaft main bearings and, via drillings in the crankshaft, to the big end bearings.
Spray jets located in the upper crankcase, behind the main bearing shells, lubricate the pistons and connecting
rod small ends. These jets are fed oil from the crankshaft oil feed. A low oil pressure warning light switch is also
located in the upper crankcase gallery.
Some oil is sent directly to the cylinder head via an internal gallery. Oil that arrives at the cylinder head is fed to
both cams via a gallery in the cylinder head casting that delivers oil directly to the sprocket end of the
camshafts. Oil is then fed through the hollow camshafts to the other camshaft bearings, the tappet buckets and
the valves.
Oil is fed to the gearbox via internal oil pipes and drillings that supply oil directly to the end of each shaft. Oil is
circu lated along the gearbox shafts to exit holes that feed directly to the bearings, gears and selectors.
Oil is fed to the a lternator to aid cooling of the alternator com ponents. The oil is taken from the cra n kshaft
oil feed and directed to the alternator via a spray bar, located above the alternator rotor, in the alternator
cover.

Heat Exchanger

The heat exchanger is used to transfer heat from the engine oil into the coolant. Oil is delivered to the heat exchanger via
a hollow centre bolt, after which it flows around the end tan k and into the heat exchanger core, where it is circu lated.
Coolant is pumped around the outside of the heat exchanger core to cool the oil. The cooled oil then exits the heat
exchanger and flows to the oil filter. An additional benefit of the heat exchanger is that, as the engine coolant reaches its
operating temperature more quickly than the engine oil, the oil is heated by the engine coolant at lower engine
temperatures; this allows the engine oil to reach its optimum operating temperature more quickly, thereby helping to
improve engine oil life, reduce exhaust emissions and reduce engine wear.
Heat Exchanger Circuit
SeiVice Manual Tiger 800 and Tiger 800XC
-
Lubrication
.A. - COOLED O I L
t6. - U N COOLED O I L
c:=>
COOLANT
-
8.5