A
THE
ENGINEI--------~----.---------
GENERAL DESCRIPTION
The
four-cylinder overhead-valve engIne Is built
In unit construction with a single-plate Borg & Beck
dry
plate clutch and four-speed gearbox.
It has a four-throw crankshaft carried in
three
renewable steel-backed dowelled shell bearings fitted
without
shlms. Th
rust
Is
taken
on
the
ce
ntre
beari ng.
The
big-ends
are
also fitted with renewable steel-
backed shell bearings fitted
without
shims.
ends of
the
tappets and
operate
the
rockers
via adJust-
able ball-ended screws.
Cooling is by thermo-siphon action, assisted by
pump and fan.
A gear-type
external
011
pump Is driven from
the
camshaft by means of helical gears and draws all from
a submerged filter in
the
sump. Ol]
then
passes
through
a full-flow type
external
filter.
Carburation is by
two
semi-downdraught S.U
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The
gudgeon pin Is clamped in
the
connectIng rod
by means of a
set
screw with a lock washer.
Pistons
are
made of alumInium ailoy and fitted with
tWO
compression rings and one oil control ring.
The
camshaft Is
supported
in
three
renewable
bearings pressed
into
the
block. and Is driven from
the
crankshaft by means of an endless
duplex
chain
which Is automatically maintained at
the
correct
tension by a spring-loaded plunger. Oil is fed
to
each bearing from
the
Internal oil gallery running
the
whole length of
the
cylinder block.
The camshaft
operates
hollow tappets which
run
directly In
the
block. Push-rods locate in
the
concave
AA
carburetters,
which are fed
with
fuel by an S.U.
electric pump.
THE LUBRICATION
SYSTEM
The main oil supply Is carried In a removable
aiuminiu msump.
When
fuII.It contains approximately
9 pints
(5,1
Iitres) 0 n engi nes up
to
No.
14947,
and
lOt pints (5·96 litres) from engine No.
14948,
of
011.
It Is replenished
through
the
filler cap In
the
front end
of
the
valve cover. The sump draIn plug Is towards
the
rear
on
the
left-hand side.
Three
pints (1·7Iitres)
of oil
must
be added before any reading shows on
the
dipstick.
M.G. Midget
(Series"
TD
").
Issue ..
(E)
7'345--1/53
Wishvilles Classic
Automobile Library
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