Sunbeam ALPINE I SERIES: APLINE II SERIES, Workshop Manual

Page: 71 / 413

WSM.124
Section B (Engine)
3. Clearance "B" between the outside of the
outer rotor and pump body must not be greater
than ·008" (·20 mm.) and not less than ·005"
(·127 mm.). Should the clearance found be
above the maximum figure a replacement pump
should be fitted.
OIL PRESSURE
The normal oil pressure is given in the Data Section
under "Lubrication". Tick-over pressure Is not
critical and the condition of the engine should be
judged by Its normal running pressure.
REASONS FOR LOW OIL PRESSURE
If abnormally low oil pressure is experienced, it
may be due to one of the following reasons:-
Low oil level in sump.
Pressure relief valve not working properly, due
to particles of foreign matter lodged between
valve and seating.
\ "11/lJJj)J/I
• ,11111�
I
I
= �
4-796 ;:
rr-J
Fig. 37.
Checking pump rotor
end
clearance
Page 33
Fig. 38. Checking rotor lip and outer rotor clearance
in the pump body
Choked oil pump filter.
Oil leaks caused by faulty unions and joints, or
by cracked or broken pipes.
Joint between filter base and cylinder block
face leaking between pressure compartment
"B" and discharge compartment "C". This
sometimes causes a lower oil pressure when
the engine is cold. See Fig. 33 .
Timing chain oil feed pipe loose or damaged.
Dilution of oil In sump (See following
paragraphs).
Worn main and big end bearings.
Worn oil pump components.