from a close grained felt, supported by a wire cage, the cage is not
detachable. The filter is mounted in the front of the drive side crankcase
and is retained by a cap washer, spring and plated dome nut. At the far
end of the filter, a steel cup is fitted to support the filter and sea] the
filter end, so that all returned oil will pass through the filter.
To remove the fabric filter. Using the Allen Key 018667 supplied in the
tool kit, unscrew the domed nut and take out the spring. If the ends of
a pair of round nosed pliers are opened outwards (to grip the inside of
the cup washer) the washer and filter can be extracted from the crankcase.
It may so happen that the washer only will come out, if so, the filter
can also be extracted in a similar manner. It is also possible that the steel
cap washer, at the far end of the filter, will remain in the crankcase, if so
this is of no consequence. The filter should be handled with care and if
damaged it should be discarded and replaced by a new one.
To clean the filter it should be immersed in petrol and when thoroughly
clean it should then be allowed to dry before re-insertion.
To remove magnetic filter. Incorporated with the crankcase sump plug is
a powerful magnet, which does not require frequent attention. For
cleaning place a tray under the crankcase, unscrew the sump plug, with
the use of a good fitting ring spanner.
Metal particles adhering to the magnet can be removed by wiping with
a grease coated rag, the grease will collect metal particles on the rag. Keep
the magnet away from large pieces of steel or iron, as contact can impair
the efficiency of the magnet.
Adjustment of oil feed. The internal flow of oil is controlled by fixed
restrictions, with the exception of the oil feed to the inlet valve guide,
which is regulated by a needle pointed screw located in the cylinder head
(see Fig. 4) and secured by a locknut.
To adjust the oil feed loosen the lock nut and screw home lightly the
regulating screw, then unscrew it the smallest amount possible and re-
tighten the lock nut.
An excess of oil to the inlet valve guide will cause a smoky exhaust and
heavy oil consumption. Insufficient oil can cause the valve to run dry
with a squeaking noise.
Exhaust valve stem lubrication (before 1964). From a drilling in the
exhaust rocker axle boss in the rocker box, oil is fed to a cavity in the
cylinder head. A further drilling from this cavity, through the cylinder
head to an oil hole in the valve guide, provides positive lubrication for
this part of the engine and needs no adjustment.
Crankcase release valve. Crankcase pressure is released into the atmos-
phere through a timed and ported release valve. The ported portion for
this valve is situated between the two driving side bearings, the valve
outlet is adjacent to the gear box housing. The valve cannot become
deranged and needs no attention.
Gear box lubrication. To top up or replenish oil for the gear box remove
the inspection plate secured by two screws on the gear box end cover.
Use one of the grades of oil specified, on no account must grease be
used,
19
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