Engine Oil Circuit Description - Triumph Tiger Service Manual

LUBRICATION 8
ENGINE OIL CIRCUIT DESCRIPTION
Oil is collected from the sump and is drawn through a mesh strainer into the oil pump rotor. Pressurised oil is then
delivered to the outside of the oil filter where the oil pressure relief valve is fitted. The relief valve is set to open at 751b/in 2
and when open, returns high pressure oil direct to the sump.
The oil pump is fitted with a single pumping rotor which supplies pressurised oil to the lubrication circuit and the oil cooler.
Filtered oil is drawn from the centre of the oil filter along the oil filter retaining tube. Part of this filtered oil is supplied,
through a non-pumping passage in the oil pump, to a horizontal gallery at the rear of the upper crankcase.
Once received in the upper crankcase gallery, the oil is delivered to the crankshaft main bearings and, via drillings in the
crankshaft, to the big end bearings. Oil exits from the big ends through holes In the connecting rods and then splash
lubricates the bores and pistons.
The remainder of the filtered oil is passed through an oil cooler and is supplied to drillings in the lower crankcase by
internal, detachable pipes. These lower crankcase drillings deliver oil directly to the end of each gearbox shaft. Oil is
circulated along the inside of the gearbox shafts to exit holes which feed directly onto the 'selectors, bearings and gears.
The same upper crankcase gallery which feeds the crankshaft also feeds the cylinder head and camshafts through an
external link pipe. The pipe, located at the rear of the engine, links a drilling in the head to the oil gallery in the upper
crankcase. The low oil pressure warning light switch is located at the base of this pipe.
The head drilling supplies oil to the front camshaft bearings which, in turn, deliver oil through the hollow camshafts to the
other camshaft bearings, the tappet buckets and the valves.
8.7