-------------
Rolls-Royce &
Bentley-------
Air
Conditioning
System
Manual
Remove the retaining circlip
and
withdraw the
drive plate. Inspect the plate for wear
of
the fibre
facing
and
for cracked springs
or
loss
of
tension;
renew the plate
if
necessary. Examine the bearing
for wear
and
clean. the collector rings.
Re-assemble
the
clutch
and
set
the
air gap
between the two drive faces by means
of
the
three adjusting screws
in
the drive plate.
The
gap
should be 0.025 in. to 0.035 in.
Examine
the
brushes
for
wear
and
renew
the
brush
unit
if
necessary.
Note:
Failure
of
the
clutch
may
be
due
to
the
presence
of
grease
or
oil
on
tbe
collector
rings
and
brushes
. This should be
removed with a
cloth
moistened wilh
petrol,
and
the
unit assembled
and
tested.
Shaft
seal
-
To
replace
With
the
clutch assembly removed from the
compressor, press in
the
sealing ring seat and
extract the circlip to permit withdrawal
of
the seal
assembly.
Remove any roughness from
the
shaft surface
by
lightly stoning,
then
coat
all
parts
with
refrigerant oil before re-assembling.
Lubricant
The
following proprietary lubricants are
approved:
Mobil Gargoyle Arctic
155
Wakefield Icematic Heavy
Shell Clavus 33
New
compressors are supplied
dehydrated
and
containing
the
correct
quantity
of
oil.
When
a
new compressor
is
installed,
it
is possible
that
some oil will
remain
in
the
system, therefore the
oil level must be checked and
if
necessary
adjusted.
The
oil level
must
also
be
checked
when any
refrigerant
is
extracted from the system.
The correct oil level, when checked by a
dipstick, should be between
It
in. and
1!
in.
Oil
level
-
To
check
Run
the engine
at
fast idle with the refrigeration
system operating, until the compress
or
is fully
warmed (approximately
IO
minutes) to ensure
Lhat
no liquid refrigerant remains
in
the compressor
crankcase. Forward-seat the low pressure service
valve,
run
the engine for a further minute and
8.100
Fig
.
12
Magnetic
clutch
- compre&&or
Page
17
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