Triumph TR6 PI Operation Manual page 109

Oil circulation
Oil drawn from the engine sump by a rotor type
pump, is delivered via a non-adjustable pressure relief valve
to a full flow type oil filter. Oil, by-passed from the relief
valve, is returned to the engine sump, and the filtered oil
passes to the engine main oil gallery. From the gallery, oil is
distributed to the camshaft and crankshaft journals.
Drillings, in the crankshaft allow oil to pass to the
crankpins and surplus oil from the crankpins lubricates the
cylinder walls by splash action thrown-up by the
crankshaft.
The camshaft rear bearing supplies a reduced flow of
oil to the hollow rocker shaft and valve assembly.
Reduction of the flow is achieved by means of two
machined flats on the camshaft rear journal. The flats
present an increased volume to. the oil supply to the
camshaft rear bearing thus reducing the overall flow to the
cylinder head. Oil spillage from the valve assembly
lubricates the camfollowers, cams and the distributor drive
shaft and gears before returning to the sump.
The timing chain and sprockets are lubricated via a
scroll on the camshaft front journal and by oil mist from
the crankcase. Oil leakage from the crankcase is prevented
by lip type seals fitted to the front and rear of the
crankshaft.
ENGINE LUBRICATlON
- Description 12.60.00
I. Sump
2. Oil pump
3. Pressure relief valve
4. Oil filter
5. Engine main oil gallery
6. Camshaft
7. Crankcase oil drilling
8. Camshaft rear bearing
9. Rocker shaft
ENGINE
Oil filtration
A full flow replaceable element type oil filter is fitted
to the crankcase and secured by a single bolt. Sealing of the
uni't is achieved by a rubber ring between the filter body
and crankcase and a rubber washer under bolt head.
Oil delivered from the pressure relief valve to the
filter body passes through and out of the centre of the filter
element into th~ engine main oil gallery -, A.
In the event of the filter element becoming blocked,
due to neglect, lubrication of the engine is never-the-less
assured by a by-pass valve which allows unfiltered oil to
flow through the filter body direct to the main oil gallery -
B.
Triumph TR6 Manual. Part No, 545277 Issue J
12.60.00