pipe banjos to the rocker spindles, when a steady drip of oil should emerge.
It
is
advantageous to flood the rocker mechanism
if
the machine has been "laid up" for
an appreciable time, or even after de-carbonising, etc. To do this, start the engine
and then remove the oil tank filler cap, when a finger can be placed over the scavenge
outlet pipe, thus forcing the oil through the rocker spindles, rockers, and to the
push rods. NOTE:-Always use the correct grade of oil as recommended on page
102.
Cheap, inferior or the incorrect grade of oil will shorten the life of the engine.
GEARBOX
The gearbox is lubricated by oil and under no clrcumscances should a heavy viscous
oil or grease be employed.
.
Splash oil
is
fed to all parts including the enclosed
gearchange and kickstarter mechanism to ensure cornplete lubrication. Fcr oil
changing and routine maintenance see pages 31 and
32.
PRIMARY CHAINCASE
The primary chaincase houses the clutcl?, primary drive chain, engine sprocket an;
for the Models 5T and 6T the alternator unit. Care should always be take2 to
ensure that the correct oil level
is
maintained; the lubricant qudities are not reduced
by condensation if the correct grade oil (SAE
20)
is
employed. Failure to observe
these elementary instructions may result in a burnt out clutch, chain failure and
possibly damage to the alternator unit. If an oil of a higher viscosity than SAE
20
is used, the clutch plates will be difficult to separate thus causing extremely noisy
gear changing. For oil changing and routine maintenance, see pages 31 and
32.
CYCLE PARTS
Component parts such as headraces, brakes and swinging fork mechanism are pro-
vided with grease nipples for lubrication purposes. Use only the recommended
greases; heavier grades will not ensure correct lubrication, whereas lighter grades
will
have
a
tendency to pass the sealing points.
.
It
will be noted that no provision
is
made for greasing the wheels; on assembly the wheels are packed with grease and
no further greasing is necessary until they are examined for general wear and tea:
(See Routine Maintenance, page 31).
CHAINS
The front chain
is
enclosed and positively lubricated (See Primary Chaincase, page
30).
The rear chain, however,
is
lubricated by controlled oil splash from the primary
chaincase. The method' used is an oil trough in the rear of the inner chaincase and
a hole drilled to atmosphere. In the outer cover a corresponding hole
is
drilled
and tapped, into which a tapered needle valve is screwed, the taper entering the
hole in the inner cover. By screwing the valve in or out the cil supply to the real-
chain is decreased or increased accordingly.
CONTROLS
The control cables require lubricating
at intervals, as, if they become dry, stiffness
in operation will resblc.
A
good plan is to remove the cable at the handlebar end,
wrap a piece of brown paper around the top end of the casing to form a funnel.
securing
it
in position by
a
rubber band.
If thin machine oil is then fed into the
funnel and allowed to remain overnight,
it
will trickle down the casing and lubricate
the inner wire.
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