Bentley R Type - Valve Rockers, Push Rods and Tappets; Camshaft

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If it is
suspected
that the
relief
valves are
not working
properly,
they can
be inspected
by removing
the
plugs
(3 and 2)
above
the low and
high-pressure
valves respectively.
In each case
the valve
spring
will be found retained
on the
plug,
and when
removed,
the
valves
may be lifted
out for
inspection and
cleaning
of
valves
and
seats.
No attempt
must
be nlade
to alter
the spring
settings by
interfering
with the
springs
themselves,
or by varying
the
number
of washers under
the
plugs.
Care must be taken
to replace
all
parts
in
a
perfectly
clean
state.
Valve
Rookers,
Push
Rods
and Tappets
The
low-pressure
oil
supply
from the
relief
valves is conveyed
Fie.
e.-RELIEF vALVEs.
vla a
pipg
ul$ oilway
through
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the
cylinder
block
and head
to
s. L.p.
vatve.
the centre
pedestal
of the inlet
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valverockershaft,whichisdrilled
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from filter.
longitudinally, and
also radially,
in
the
plane
of each rocker,
to lubricate
the rocker arm bearings.
The
rocker arms
are also
drilled, the
holes
running through the
bearing
bushes, to lubricate
the
push-rod
ball ends and
the
ends of the
valve
stems.
Each valve
stem is
provided
with
a
pac"king gland, held
in
position
by the inner
valve
spring, which
prevents excess oil
from
percolating
down the valve
guides.
Oil
is returned
from the.rocker
casing
to the
crankcas-e
through
the
push
rod tunnels.
Gamshaft.
The camshaft, driven
by
single helical
gears,
is
carried in
four
plain
bearings,
these being
lubricated
with
high-pressure
oil through
drillings in
the
crankcase
webs.
The
camshdft
driving
gears
are lubricated by
the
jet
in
the wheel-
case, from the
low-pressure
system.