Sunbeam ALPINE I SERIES: APLINE II SERIES, Workshop Manual

Page: 83 / 413

WSM.124
Section B (Engine)
Fig. 52.
Throw away type full flow filter-internal construction
FULL FLOW OIL FILTER-Throw away
type (See Fig. 52)
The throw away type full flow oil filter is screwed
to an adaptor casting (I) bolted on the right hand
side of the engine Cylinder block.
Oil from the engine oil pump enters compartment
"B" in the filter adaptor casting (I) and passes
through eight port holes into the filter body. All
oil entering the filter passes through the filter
cartridge from the outside to the centre as shown
in Fig. 52 and thence through the screwed spigot to
compartment "A" in the adaptor casting. From
here it enters the engine main oil gallery.
The entry ports on the underside of the filter are
shrouded by a flexible anti-drain valve (3) and (4)
which prevents the filter from draining during
standstill periods.
The throw away filter unit must be changed at the
recommended periods given in the "Owners
Handbook".
Page 4S
Oil pressure relief valve. (See Fig. 53)
A piston type relief valve, situated in compartment
"C" in the filter adaptor casting, opens to return
all excess oil delivered by the oil pump to compart­
ment "B" when the oil pressure exceeds approxi­
mately 60 lbs. sq. in. (4 kg. sq. cm.). The excess oil
discharges into compartment "C" from where it
drains into the engine sump.
The oil pressure relief valve can be removed as a
complete unit with a 13/ 16 A.F. ring spanner.
By-pass Valve
A by-pass valve (6) is fitted inside the throw away
filter unit and forms part of this assembly as shown
in Fig. 52 .
If the filter element (5) becomes choked, through
neglect to change the filter assembly at the servicing
periods, the by-pass valve (6) opens and allows oil
to pass directly to the engine bearings without
being restricted by the blocked element (5).
Opening of the by-pass valve (6) can only occur
when there is a pressure difference of over 7 lbs.
per sq. in. (0·5 kg. sq. cm.), above and below the
by-pass valve.
OIL PRESSURE
RELIEF VALVE
Fig. 53.
Throw away type full flow filter-oil
pressure
relief
valve