ENGINE
I.
CYLINDER BLOCK
Vandervell replaceable shell bearings have
been,introduced for the 2nd, 3rd and rear
camshaft journals. These are manufactured
to very fine limits, and whilst certain fitting
precautions must be observed, line boring
of the assembled bearings is unnecessary.
Removal of the rear bearing will necessitate
the removal of the sealing disc behind it,
which, in turn, will require the removal of
the gearbox, clutch and flywheel. The tool
illustrated in Fig. 1 is designed to assist
in the removal and replacement of the
bearings.
REMOVER &GUIDE GUIDE PIN
kLC
Fig.
I.
Fitting Intermediate Camshaft Bearing
using Churchill Multipurpose Tool
Nn.
32
with
Adaptors
S.32-I.
(a) Camshaft Bearings
To remove, proceed as follows
:-
(i)
Using a suitable tool, drift the
sealing disc out of the rear cam-
shaft bearing housing.
(ii)
Unscrew and remove the three
shouldered setscrews and plain
washers which retain the bearings
in position.
(iii)
Assemble the extracting tool and
adaptors into the cylinder block
as illustrated, and withdraw each
bearing in turn.
(b)
To
Fit
New Bearings
See Fig. 1 and observe the following:
The oil feed holes must be correctly
aligned and when drawing the bearings
into position
all
possible precautions
should be taken to ensure that these
do
not
turn
and so misalign the holes.
Ensure also that the locating hole in
each bearing is centrally disposed in
the tapped hole which accommodates
the locating screw. Failure to observe
this instruction may. result in the
bearing becoming distorted when the
locating screw is tightened.
Fit a plain steel washer of
h"
thickness
(1.588
mm.)
between the head of each
locating screw and the cylinder block.
Refit or replace the camshaft sealing
disc
if
necessary.
2.
ALUMINIUM PEDESTALS FOR
ROCKER SHAFT
New rocker pedestal brackets of aluminium
alloy were incorporated in normal produc-
tion at Engine No.
TS.12564E. The new
metal, by reason of its higher degree of
expansion when hot, enables the same
rocker clearances to be used for exhaust
valves as were previously applied only to
the inlets. This reduction in the exhaust
valve clearances has the advantage of
reducing
"
tappet
"
noise when the engine
is cold without any sacrifice of performance.
Where it is desired to fit the new pedestal
brackets, these should
be fitted as a
complete set, the part numbers being as
follows
:-
Aluminium Pedestal Bracket (Plain)
-
3 off-Part No. 112546
Aluminium Pedestal Bracket (Drilled)-
1 off -Part No. 112545
3.
PISTONS
From Engine No. TS.9731E, the pistons
are fitted with
:-
l Plain ring.
1 Taper ring.
1
Oil
scraper ring.
4.
COMBUSTION HEAD
To further improve performance,
"
High
Port" type combustion heads where in-
corporated in production at Engine No.
TS.9350E. In countries where high octane
fuel is unobtainable, the compression ratio
may be lowered to 7.511 by the use of a
compression plate, Part No. 200906. This
plate must be used in conjunction with a
steel
"
Corrojoint
"
gasket, Part No. 202775
in addition to the normal gasket.
When using this low compression plate it
wi!l also be necessary
to
use Champion
L.
10
sparking plugs gapped to 0.025" and special
push rods, Part No. 114048.
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