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THE ENGINE
A
Replatemmt
Replacement
of
the
crankshaft is
a reversal
of the
above operations. If the oil seal fitted in
the
rear main
bearing cap shows any signs of damage
it
should
he
renewed.
Before replaciDg
the
crankshaft thoroughly clea.D oa1
all
oOways.
Section
A.34
CAMSHAFT
LOCKING
TOOL
To set the valve timing
acctUately
it
is
necessary
to
lock
both camshafts in the correct timing
position
as
described in Section
A.l 9.
A
suitable tool is illustrated
in
Fig. A.l4
and two
will
he
required, one for each
camshaft.
Section A.35
FLYWHEEL
STARTER
RJNGS
To
remove
the old
starter
ring from the
llywheel
flange
split the ring
gear
with a
cold chisel,
talcing care
not
to
damage
the flywheel.
Malee
certain
that
the bore
of the
new
ring and
its
mating
surface
011
the flywheel are
free
from burrs and perfectly clean.
To
fit
the new
ring it
must
he
heated
to a temperature
of 300
to
400•
C. (572 to
752• F.) indicated
by
a ligllt-
blue surface colour.
If
this
temperature is exceeded
the
temper of
the
teeth will
he
affected.
The
use of a thermo-
statically controlled
furnace
is recommended.
Place
the
heated ring on
the llywheel with
the lead of
the
ring teeth
uppermost. The expansion will allow the
ring
to
be
fitted
without force by
pressing
or tapping it liglltly
until
the
ring
is
hard against
its
register.
This operation should
he
followed by natural cooling,
when
the
'shrink
fit'
will
he
permaoently
established
and no further treatment required.
Section
A.36
CON~CTING
ROD ASSEMBLIES
Each connecting rod assembly has a standard weight
of
I
lb.
15 oz. 6 dr. (889·47
gm.)
but may vary above
or
below this weigllt approximately plus or minus
I
oz.
(28·35 gm.).
Complete
sets
of connecting rod
assemblies
for replace-
ment
should
all
be
of
identical
weight (as in
case
of
production), but, where one
of
a set is changed,
it
is
essential
that
the
replacement
connecting
rod
does not
differ
from
lhe
others
by
more
than 3
dr.
(5·32
gm.).
MGA
(Twin
Cam).
Issue
S.
32403
T
I
I
t
.
I
I
Y.
I
I
:
I
I
I
I
:
I
I
,~
8,
I
••
..
11
•
u•
"' •
....
Ysz
X
I
/ v
T
(
f.y
/:
,
-
---
.
%
·
t
\..
J
~-----
'
'
.
~
•
l~sz
-·
Fig. A.l4
A
canuloaft locking tool
To facilitate identification, assemblies
now
being
produced,
if
not to
standard
weigllt,
will
be
stamped
as
follows:
+ 1,
+
2,
etc., to indicate drams
above
standard.
I, 2, ete., to indicate drams below
standard.
Only
six weights of
rod,
rigllt-hand and left-hand (12
in all), are serviced
and the
table
shows how
tbese sizes
cater for all contingencies.
NOTE.-
This
table mnst be
strictly
aclbtred to
If
eorrect replacements are to be easared.
To
replace
Use only
Standard:
+I,
+
2,
+
3,
-1
4,
+
S
+
2
+
6,
+7.
+
8,
+
9.
+
10
+
7
+II,
+
12,
+ 13, +
14,
+
15,
+
16
+
13
I,
2, 3,
4,
5
2
-
6, 7, 8, 9,
10
7
II,
12, 13, 14, 15, 16
13
A.l1
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