A
TllEENGINE---------
engagement
wIth
the
hole in
the
sprocket
and
one
flat of
the
nut.
Replace
the
timing chain case as detailed In Section
A.19.
To carry
out
this
operation
wlth
the
engine in
the
frame it will be necessary
to
remove
and replace
the
radiator
as.
detailed In Section D.2.
Note.-The
engine
reqUires turning twenty times
before
the links and marked teeth come back to this
position
again.
Section
A.22
THE TIMING
CHAIN
TENSIONER
The
chain
tensloner
consists of an hydraulically
damped, spring-loaded
plunger
and combined slIpper
block. encased in a housing which Is bolted
to
the
cylinder block.
The
slipper
Is held against
the
chain
by
tne
tension
ofthe
spring and
the
oil
pressure.
The
spring, which is of 22 gauge (·71 mm.)
wire,
has a free length of 2·795 in. (71 mrn.), an
outside
diameter
of ·295 in. (7,5 mm.) and
nas35
effective
coils.' It gives a load of 1·25 lb. (,57 kg.)
when
com-
pressed
to
\·89 in. (48 mm.).
The
plunger is fed With oil from
the
crankshaft
front
main bearing via an oilway drilled
through
the
cylinder block, mating with an ollway in
the
tensioner
housing
or
feed block. This oilway Is
then
reduced
in
diameter
to
·04 in. (I mm.) and
the
011
feeds
through
to
the
stem of
the
plunger. which is ·43 In.
(II
mm.) in
diameter,
and
then
through
the
bleed
hole In
the
plunger. which
is'
lOin. (2·5 mm.)
diameter.
This causes an. increased
pressure
and produces a
cushioning effect
between
the
chain and
the
slipper.
Oil
passing
through
the
bleed hole passes on
to
the
chain and slipper,
ensuring
effective lubrication be-
tween
the
two.
A.16
Section
A.23
REMOVAL OF THE CHAIN TENSIONER
Break
the
lockwtre at
the
two
set
.screws securing
the
chain
tensioner
feed block
to
the
cylinder block
and
unscrew
them,
taking
care
to
hold
the
assembly
against
the
chain
to
overcome
t he
ten
sion of th e sprlng.
Before replacIng,
examine
the
bore
ofthe
feed block
for
wear
(thls should be ·43
In.±·004
in.
(II
mm.±
·1 mm.r) and make
sure
that
the
oHway Is clear.
Look
for
any
wear
on
the
chain
tensloner-the
out-
side
diameter
of
the
stem
should be ·43
In.-·004ln.
to
-·012
In.
(II
mm.
-·1
mm.
to
-·3
mm.), Finally
check
the
tensioner
spring.
to
the
details
already
given
In Section A.22.
When
refitting make
sure
to
rewire
the
set
screws securing
the
feed block.
Section
A.24
REMOVAL
AND
REPLACEMENT OF THE
TAPPETS
Remove
the
air
deaner.
Remove
the
cylinder head
COVer.
U"nbolt
the
fume
pipe from
the
engine side
cover
and remove
the
cover.
Remove
the
rocker
gear
from
the
cylinder head as
Indicated in Section A.8, and
wIthdraw
the
push-rods,
Withdraw
the
tappets.
Replacement Is
carried
out
In
the
reverse
manner
to
that
detailed for removal. and
both
the
push-rods
and
tappets
should be
refitted
In
the
same positions
they
occupied before removal
to
avoid
the
need for
extensive
adjustment.
Care
should be
taken
when
refitting
the
Side
cover
to
see
that
the
draln holes in
Its
gasket
are
at
the
bottom.
Section
A.25
REMOVAL
AND
REPLACEMENT OF
THE CAMSHAFT
Drain
the
radiator.
Remove
the
bonnet.
Remove
the
tappets
as detailed in Section A.24,
otherwise
fouling
between
the
cams and
tappets
Is
likely
to
cause damage
to
the
running surfaces.
Remove
the
sump
as detailed in SectIon A.2.
DIsconnect
the
hlgh-tenstcn leads from
the
plugs
and
remove
the
distributor
after removing its location
bolt
from
the
side of
the
cylinder block housing.
Remove the olI pump by removing th e bolts secu ring
the
body
to
the
cylinder block.
Remove
the
timing
chain case,
the
timing chain and
chain
wheels
as detailed In Sections A. 18 and A.20.
Wishvilles Classic
Automobile Library
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