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A
THE ENGINE
Section A.30
DISTRIBUTOR DRIVE GEAR
Fitting
Tum
the engine until No.
4
piston is at
T.D .C.
on
its
compression stroke. When the valves on No.
I
cylinder
are
'roclci.ng'
[Le.
exhaust
just closing and inlet just
opening) No. 4
piston
is
at
the
top
of
its
compression
stroke.
If
tbe
engine
is set so that
the notch
in the crank-
shaft
pulley
is
in
line with the
projection in
the timing
chain cover the piston
is
exactly at
T.D.C.,
giving
the
correct
ignition setting
(see
Fig.
A.
7).
Turn the
drive
gear
to
the position shown in Fig.
A.l
3.
The driving slot will
be
horizontal with the large offset
uppermost.
Ao the
gear
engages the half-speed shaft
the
slot will
tum in
an anti-dockwise
direction until it
is in the
two
o'clock position.
Secure the
drive gear
housing with the
two
nuts,
spring
washers, and flat washers.
Refit the
distributor,
referring
to Section
B.7
for
retiming
instructions if the
d istributor
clamp plate has been released.
Section
A.31
OIL PUMP
Remove
the sump
and
oil
pump
strainer (see Section
A.25).
Two
bolts secure
the oil
pump cover and
three
studs
secure the pump to the
crankcase.
UDSC1'ew
the stud nuts and remove the pump and drive
shall.
When refitting
the pump use
a
new
joint
washer.
A.l6
Fig. A .l3
RepiiJcing
the
distribuJor
drive
gear.
The slot
is
horizontal with the large
offset uppermost
DlsmanlliDg and
reassembliDg
The oil pump cover is attached to the body of the pump
by two bolts
and
svring washers, and
when
these
are
removed the
oil
pump
cover,
the outer rotor, and the
combined oil pump
shall and
inner
rotor may
be
extracted.
NOTE.- l f
a new or
reconditioned
oil pump is
be.
i ng
fitted it
is
oecessary
to remoYe the
half-speed
shaft (see
Section A.29)
to
enable a
eheck
of the pomp
gear
end-float
and
'
free
spin'
to
be made.
After
removing the
half-speed
shaft moWJt
the
pump with
dri~e
gear and
thrnst
washer
in position and tighten down
to
the <:Orrect torque figure
(275 lb.
in.). Cbecl< that
the
shaft
rotates
freely
and that
the
end-ftoat
Is
not excessive. The
oil
pomp must
be
assembled in the
dry
condition
but
lubrication
should be
used on
the
oil pomp driving gear spindle in the cylinder
block. Refit the half-speed sltaft,
etc.,
as
detailed in Section
A.29.
Section A.32
FLYWHEEL
Remove
the
power
unit (see Section A.24).
Remove
the gearbox from
the
gcarbo" mounting plate.
Mark
the clutch and
flywheel
to allow the
two
compo·
nents
to be reassembled in their original positions.
Remove
the
six set screws securing
the
clutch to the
fly-
wheel
and remove the clutch.
Mark
the flywbeel and crankshaft flange. Unlock
and
remove
the
six nuts and three
lock
plates which
secure
the flywheel to the crankshall mounting flange and
remove
the
fiywheel.
Replacement of
the
flywheel
is
a reversal of the above
instructions.
Take care
to
fit the flywheel
and
clutch in
their
original locations by lining up
the
marks made
when dismantling,
otherwise engine
vibration
wiU
result.
To
release the
special
flywheel bolts
the engine
sump
and rear main bearing
cap must
be
removed.
Section A.33
CRANKSHAFT
Removal
Remove the engine from
the
car
and
remove the
clutch
and
flywheel
(Section
A.32)
and the
gearbox
mounting
plate.
Remove the sump, oil strainer, timing
chain
cover,
timing
chain, and engine front plate
(Section
A.23).
Remove
the big-end bearing cap and
then
take
off
the main bearing caps (see Section A.26).
Mltrk
the
big-a~d
bearing
cap
and bearing to ensure
that
It
is
reassembled to the correct journ.al, taldng
care,
in
the case of the bearings, that
they
are
not
damaged
or
dlstol'led
whal
marking.
Punches should
not be !IS<'d
for
this
purpose.
Lift
the crankshaft out
of the
bearings.
MGA
(Twin
Cam). wue
4.
32403
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