Sunbeam ALPINE I SERIES: APLINE II SERIES, Workshop Manual

Page: 86 / 413

Page 48
the pipe (I) and for ventilation air to be drawn
from the "clean" side of the air cleaner, into the
crankcase rocker cover through the pipe (4),
flame trap (3) and pipe (2).
On the first arrangement air was drawn into the
crankcase through the gauze filter on the tappet
cover.
Servicing
This must be carried out at the recommended
intervals given in the owner's handbook or more
frequently where short journeys or slow speed
driving are usual.
Neglect of servicing will cause sludge and water
formation inside the engine which will increase
engine wear.
Regulator valve-cleaning
Dismantle and check the condition of the valve
seat ( I 0) and valve (7). If they are worn a new
regulator valve assembly should be fitted.
The condition of the spring (8) is very important
as it controls the opening and closing of the valve
(7) against inlet manifold vacuum. If damaged or
corroded it must be replaced.
When re-assembling, the valve unit make sure
that the spring (8) Is correctly located In the body
(10) and that the valve (7) is not tilted across the
body.
Regulator valve-testing
Refit the valve unit to the inlet manifold leaving
the connecting hose off of the inlet end. Run the
engine and check the valve operation by making
the following tests.
RO OTES HAN UAL WSH. 12 ..
Section B (Engine)
I. Check that the engine idles correctly. When
idling It should be possible to push the valve (7)
hard against Its seat; with a suitable rod, without
affecting the slow running performance.
2. Check that the valve (7) opens when the
engine speed Is suddenly Increased by opening the
throttle from idling. Do not exceed 3,000 RPM.
Valve movement can be seen by putting a short
length of thin wire (approx. 12 ins.---4 ems.) Into
the inlet end of the regulator. When the engine
speed is suddenly increased the valve (7) should lift
from Its seat. This will be shown by the test wire
lifting about 2-3 mm. Sudden closing of the throttle
should allow the engine to Idle correctly.
3. If the correct operation cannot be obtained a
new spring (7) should be fitted. THESE SPRINGS
MUST NOT BE STRETCHED OR FULLY COM­
PRESSED.
4. Remove wire used to indicate valve move­
ment and connect rubber hose (I) to the valve
inlet end after making sure that it is not obstructed
by sludge.
Connection hoses
If necessary these should be removed and cleaned
Internally.
Flame trap-where fitted
The flame trap should be washed In kerosene
(paraffin) and Inverted so that it drains dry. THE
FLAME TRAP MUST BE REFITTED IN THE POSI­
TION SHOWN IN FIG. 55. Incorrect positioning
of the flame trap will allow It to gradually flit tip
with oil and prevent the crankcase ventilation
system from operating.
Air intake filter-if fitted.
This filter should be cleaned In the same way as
the flame trap.
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