Sunbeam ALPINE I SERIES: APLINE II SERIES, Workshop Manual

Page: 69 / 413

WSM.124
Section B (Engine)
Fig.
3S.
Oil pump-cut away view.
will be appreciably reduced in compartment "A"
due to starvation, and this will allow the by-pass
valve to open, in turn ensuring a feed to the oil
gallery in such conditions.
The oil pressure relief valve has a hexagonal head
and Is screwed Into the front of the filter body
casting.
The filter by-pass valve is similar and is screwed into
the rear of the filter body casting.
To renew element
Drain filter by removing hexagon-headed plug
details of which are given in Fig. 34
Remove centre bolt.
Take out the element and renew.
White arrows show direction of oil flow
Run engine and carefully check for o/1 leaks.
I st
re-issue
Page 31
Examine sump level after running engine as cne
pint of the oil will be taken to fill the filter.
OIL PUMP (See Fig. 35)
A four-lobe rotor mounted on the main spindle
drives a ring into which are machined five internal
lobes. The outer diameter of the ring rotates In the
circular bore of the oil pump body, which is offser.
from the main spindle.
The action of the four-lobe cam on the five-lobe
ring creates a strong pumping force by progressively
increasing and reducing the clearance between each
set of lobes. The pump itself is driven by skew
gears from the camshaft.