J.A.P 6 - Page 6

(
(
ROUTINE
MAINTENANCE.
1. DRY
TYPE dIR
FILTER
(Where
firted)
It
is
essential
to
periodically
clean the
element by removing
and
shaking
the felt pad,
also
dry if necr:ssary.
Carefully
replace the
ilement.
14.
OIL BATH
ÅIR. FILTEId
(trVhere
fitted)
It is
essential
to
fi1l
and maintain
oil
to the indicated
level on
the filter
bowl
using
clean
engine
lubricating
oil.
Occasionallv
remove the filter
and wash
the
element in petrol
or paraffin,
allorv
to drain,
clean out the
filter
bowl and
replenish
with
fresh lubricating
oil.
2. FLYWI{EEL
FAN
CASING
Never operate
the
engine rvith
any part of
the fan
casing removed,
as this
will allow
the engine
lo overheat
and
the
piston
to score.
This
part is
absolutclv
necessary
to rlircct
the
alr
florv
so tliat the
engine may
be properly
cooled.
3.
COVER
FOR.
ENGINO.
An engine.which
is exposed
to
th,. u,eather must
always
be covered
up
when
not in
use.
4.
OVER.LO,{I}ING
TEI}T }.INGINE.
Do not
overload
a cold
engine. r\lways
allorv it
to run
light for
a
minute
or
two.
5.
CLEANLINESS
OF SPARKING
PLUG.
Keep
the sparking plug
clean
and a
gap
o{
.025".
6.
DECARBONISING.
Decarbonise
every 400
working hours. (See
paragraph (a),
Page
l0).
7.
LUBRICATION
OF ENGINE.
It is important
to use
good
lubricating
oil, and
the most
suitable
oils
for
these engines
are'-
SUMMER_CASTROL
XL
WINTER
-CASTROLITE
The oil circulation is
maintained
by splash
from
a dipper on
the con-
necting
rod, and
works with
a minimum
of
attention.
One point
of
vital irnportance
is
to see that
the engine
never
runs
with
the oil level
in the
sump below
the bottom
end of
the dipstick,
otherwise
serious
damage
may be caused
to the
engirre.
In the
case of
an engine
working
at an excessive
angle
due to
uneven or
sloping ground,
it
is
most
important
to keep the oil
sump
topped right
up, so
that there
is no
danger
of the dipper
missing
the oil
and starving
the
engine.
It is important
that
the engine
base is standing
level
when
checking
or
re-filling
oil.
Check the oil level with
the filler
cap unscrewed,
remove
cap and
wipe
dipstick,
rest the
cap on top
of
the oil Iiller
boss
to obtain
correct
reading.
All
parts
are lubricated,
including
tappets
and valves;
these
are
sealed in
a dust-light
cover.
After
every 50
hours' running,
but more frequently
under
due§
condltions,
and preferably
when the
engine
is hot,
drain
the
oil,
flush out tlie oil
sump with flushing
oil
(paraffin
should
not
be used),
then refill
with fresh lubricating
oil
after a
small quantity
of
fresh
oil
has
been run
through, to make
sure
there are no
traces of
the flushing
oil left in
the sump.
8. TAPPET
ADJUSTMENT.
For
method of adjustment
see
paragraph
(a),
Page
12 (Valve
Gear).
9.
IF
COMPRESSION IS
POOR.
(o)
Check
tappet
clearances.
(å)
Check
cylinder
head nuts,
and tighten
if necessary.
(c)
Examine
valve seatings.
(d)
Inspect piston
and piston
rings.
10. TO INSPECT
PISTON
AND
RINGS.
See that rings
move freely
in
their
grooves
and are
not cracked, worn
or broken, that all
ring grooves
are
clean, also
see
that the oil
drain
holes in
the bottom ring grooves
are
clear.
When replacing
see that the piston
and rings
are replaced
as
they were
fitted
before removal.
1I.
MAGNETOS.
fyp"
e. 576F..2. (Ref.
Pages
16 and
1Z).
Type
CJ.9B6. (Ref.
Pages
18 to
2l).
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