--
--
.-
--
TIIE
ENGINE A
maintaining engine lubrication untila
new
filter Isfitted.
The spring for this ball valve should be
19
gauge
or
·040 in. (1·02 mm.), ·5354 In. (13,59 mrn.) overall
diameter.
2·224 In. (56·5 mm.) free length. Total
numberof
coils 12,glving a load
of5
lb. (2,27kilograms)
wilen
compressed
to
a length of ·649 In. (16·5 mrn.].
SeetiOD
A.7
REMOVAL
AND
REPLACEMENT
OF
THE MAIN
AND
BIG-END
BEARINGS
The replacement of big-end bearings can be carried
out
after
removal of
the
sump.
without
taking
the
engine from
the
frame,
but
in
order
to
replace
the
main bearings
the
engine must be removed. Renew-
able steel-backed bearings
are
used
for
both
the
main crankshaft
bear
ings and
the
big-end bearings.
It is Imperative
that
no adjustments be made
to
the bearings.
Bearings
which
are
worn should be
~
. .
Fig. A.S.
The
by.pus
reliefvalve of the
011
pump with Its components
withdrawn.
lnd
(inset)
pr
iming
the
t3.rly
type
oil
pump
through
the
delivery opening on
the
pu~p
cover
.
later
pumps,
with
integral filter.
are
also primed
through
a
s
lmilar
plug.
but
a
certa
in number of
these
pumps are not
fitted with
the
spe'ial
priming plug. (See
Secqon
A.-4-I).
renewed.
Additionally, If
the
crankshaft Journals
are
found
to
be in a
worn
condition, a service re-
ground
crankshaft
complete
with main and big-end
bearings,
as
supp
lied from
the
Works
. should be
fitted. (See Section
A.H.)
The big-end bearings are located in position by a
small
tag on
one
side of each half-bearing, and
the
bearings
are
fitted so
that
the
tags come on
the
same
side of
the
bearing housing. as shown in
the
illustra-
t ion. Main bearings
are
located in position by
dowe
ls
in
the
bearing caps, and In
the
crankshaft housing.
To detach
the
big-end bearings,
extract
the
split
pins from
the
big-end bolts, and undo
the
nuts.
Remove
the
connecting rod caps and
extract
the
bearings.
Care
should be exercised
to
see
that
the
M.G. Midget (Series .. TO •'J. Issue 3 (E) 793045-1 /53
bearing Journals and
other
parts
are
cleaned before
Installing new bearings. No scraping Is
required,
as
the
bearings
are
machined
to
give
the
correct
dia-
metrical clearance of
between
·0005 In.
(·011
mm.)
and
·002
In. (,056 mm.) and a side clearance
of
from
,004 in.
to
·006 In. (·10 mm.
to
·15 mrn.),
To
renew
the
main bearings it is necessary first
to
remove
the
main bearing caps, by removing
the
split
pins from
the
retaining studs and unscrewing
the
Compression rings ...
~
~~
-;;~~=:::::::::::ii~
.
."""
Oil control rJng
..
Piston
..
Gudgeon pin
Spring
WlSher
-----_-!'!.~~
Clamping screw
-------!Jl~~ni
Connecting rod
-----
....
-1
Big-end bolts
Connecting
rod
cap
....
_1
Fig. A.9.
The piston and connecting rod
assembly.
A.9
Wishvilles Classic
Automobile Library
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