The engine Section F
3 Remove oil filler cap from rocker cover
un
screw retaining screw and
lift
air cleaner
body
from base plate.
4 Disconnect throttle and choke cables
at
carburettor.
5 Unscrew
two
1
5
6
UNF
se
lf locking nuts,
complete
with
fibre washers and remove rocker
cover.
6 Remove
two
1
5
6
UNF nuts and lockwashers
and
lift
carburettor from inlet manifold studs.
7 Disconnect temperature gauge sender
un
it
lead at thermostat housing.
8
Drain
radiator
and
disconnect top
hose
and
by-pass hose from thermostat housing.
9 Disconnect heater hose from adaptor
at
rear
of
cylinder head.
10
Disconnect cool
ai
r hose from heater and
engine
bulkhead.
11
Disconnect high and
low
tension leads at
Figure
13
Cylinder head nut t
ight
ening
sequence
9
2 Remove valves from cy
li
nder head using
valve spring compr
ess
ion
too
l
ke
eping in correct
order. Retain
valve springs, cover
s,
cups a
nd
cotters
for
inspection.
coil. 3 If valve guides are
worn
remove them using
T
oo
l No. RT74
78
(see Fi
gu
re
14
).
12
Disconnect spark plug leads and remove
distributor cap.
13
Unscrew i UNC bolt, complete
with
plain washer and lockwasher securing
distributor. Do
not
disturb clamping bolt
securing distributor unless the ignition
timing
is
to
be
adjusted on reassembly.
14
Remove
twe
lve i UNF and thr
ee
-,\
UNF
nuts and washers from
cylinder head.
15 Withdraw the push rods keeping them in
their correct order.
16
Carefully
lift
cylinder head from the
cylinder block.
17
Replace in reverse order after cleaning the
cylinder head and block faces and fitting a n
ew
gasket. To ensure a
good
sea
l
when
replacing
head, smear grease around the metal edges
of
the gasket bore eyel
ets.
Tighten the cylinder head
nuts
to
a torque
of
3·46kg m
(25
1b
ft)
in the
sequence shown in
Figure
13
. The three
-,\
UN F nuts must be fitted to the spark
plug
side
of
the cylinder head and tightened
to
a
torque
of
2·07kg m
(151b
ft).
Operation
10
- Cylinder head
decarboni
se
(with
cylinder head
removed)
1 Unscrew the four spark plugs.
4 Use a piece
of
sharpened
wood
to break
up
the carbon deposits on the piston faces
of
the
cylinder head and then polish
with
wi
re wool.
5 Reface all valves
or
replace
if
badly burnt
or
the stems are
unduly
worn
.
6
Replace valve guides in cylinder head using
Tool No. RT7478 (see Fi
gure
14).
Figure
14
Valve guide removal and
replacement
1 Valve
gu1de
removal
2 Valve guide replacement
3 Valve guide protection sleeve
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