BSA D14/4 BANTAM SUPREME D14/4 BANTAM SPORTS, Workshop Manual

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D14/4 LUBRICATION A4
It is therefore essential that the correct oil level be
maintained.
To check the gearbox oil level remove the level
screw and filler plug, and pour oil into the filler until it
just begins to flow from the level hole. Replace the
screw after filling, having first checked the condition
of its fibre washer.
FIG. A2.
It is important that S.A.E. 40 grade oil be used, not
any of the self-mixing oils recommended for the
engine. As the clutch is lubricated from the same
supply, special anti-friction additives should not be
mixed with the gearbox oil.
Changing the oil in the gearbox is best done after a
run, as the oil is warm and therefore more fluid. Take
out the filler plug, and unscrew the drain plug
underneath the gearbox. Allow all the oil to drain into
a suitable receptacle before cleaning the gearbox with
flushing oil. Replace the drain plug and refill the
gearbox to the correct level as described above. The
condition of the drain plug fibre washer is important;
over-tightening will damage it.
CONTACT BREAKER
The contact breaker is mounted on the right-hand
engine shaft and is housed within the primary cover.
It is essential that no engine oil is allowed into the
contact breaker housing and to prevent this, an oil seal
is fitted behind the contact plate.
Periodical lubrication of the contact breaker cam
however, is necessary. Provision is made for this in the
form of a grease-soaked wick.
The grease (preferably of the high-melting point
type) should be applied sparingly to the wick every
5,000 miles (8,000 km.). Avoid using the grease
excessively, otherwise the contact points may become
contaminated, resulting in misfiring and difficult
starting.
REAR CHAIN
It is a good practice to periodically remove the rear
chain and clean it thoroughly in petrol or paraffin.
When dry, gently warm the chain in a mixture of
grease and graphite, allow to cool and wipe off any
excess grease. Before replacing the chain, clean both
the rear wheel and gearbox sprockets. Remember that
the chain connecting link must be fitted with the closed
end of the spring fastener pointing in the direction of
chain travel (
i.e., on the lower run of the chain, the
closed end should be rearward).
See section H for further information.
STEERING HEAD
The steering head bearings are packed with grease on
assembly and should only require repacking at the
intervals quoted on page A2. Full details of removing
and replacing the steering assembly can be found on
pages E8 & E9 in the fork section.
Wipe out all the old grease from the bearing cups
and clean the ball bearings by rolling them in a clean
rag. After cleaning, carefully examine the bearings,
cups and cones for pitting, corrosion or cracks, and
renew if necessary.