ENGINE
If the timing is correct the two dimen-
sions will be identical. Having finally
proved the valve timing, the chainwheel
locking tabs may be turned up.
(i) The timing gears are now marked with
a scribe line as shown in Fig. 21.
(j)
Fit the timing chain tensioner and
secure with plain washer and split pin.
Replace timing cover.
(k)
The rocker clearances are now set to
their working clearances of .012" ex-
haust valve and
.010" for inlet valves
(see page 22). When the car is used for
high speed work the valve clearances
for
all
valves is .013".
See also "Engagement of Oil Pump and
Distributor Driving Gear". (Page 16.)
It is important that the "Distributor and
Tachometer Gear
Assemblv" is fitted with
an end float of
.003" to
.oo?'.
This
can
be measured in the following
manner
:-
(a)
Measure and note the thickness of a
4"
washer and assemble it with the
distributor-tachometer driven gear to
the oil pump driving shaft.
(b)
Install this assembly in the cylinder
block with the washer between the gear
and the shaft bearing in the cylinder
block. Ensure that the shaft is engaged
in the oil pump.
(c)
Over the gear assembly
fit
the distri-
butor adapter.
(d)
Utilising feeler gauges, ascertain the
distance between the distributor adap-
ter and its mating face on the cylinder
block.
(e)
When this measurement is compared
with
:he thickness dimension of the
washer the difference
will
represent
the amount of "end float" or "inter-
ference".
Example
Thickness of washer .06OV
Distance between faces .055"
The distance, being less than the
washer,
gives- the
gear
assembly an
"
end float
"
of
.005".
Conversely
Thickness of washer .MOu
Distance between faces .M5"
The distance being greater than the
washer, gives
he
gear asse=lb!p
m
"interference" of
.005".
It
will be
necessary to
fit
shims or packings under
the distributor adapter to obtain the
correct end float.
Assuming the first instance to be the
case, it will be necessary to add one
packing of
.002"
thickness to bring the
end float to top limit. For the second
instance it
will
be first necessary to
"zero" the interference,
i.e.,
.005"
and
add sufficient packings to obtain the
correct end float. The packing necessary
in this case is .011" for a middle limit
end float.
(f)
Remove the gear assembly, shaft and
washer from the cylinder block.
(g)
Turn the engine until the piston of No.
1 cylinder is at T.D.C. on compression
stroke, in this position both valves will
be closed.
(h)
Fit the WoodrufFe key to the oil pump
driving shaft and insert the shaft in the
block to engage the oil pump with its
tongue. Rotate the shaft until the key
is at right angles to
h\e camshaft and
points away from the engine.
(i) Position and lower the
distributor-
tachometer driven gear on the drive
shaft
until the keyway and the key
engage. Continue a downward motion
turning the gear clockwise to effect
engagement with the driving gear on
the camshaft. Caution must be exer-
cised to prevent dislodging the
Wood-
ruffe key.
(j)
When correctly engaged the offset slot
in
the gear assembly will be aligned
with No.
1
pushrod sealing tube. and
the offset towards the rear of the
engine. Similar to Fig.
16.
(k)
Assemble the distributor adapter to-
gether with the necessary packings to
obtab the correct end float. Secure
with
nuts and locking washers.
(I)
Fit the distributor body with the rotor
arm
pointing to No.
1
push rod tube.
(m)
Adjust the points to .015" a~d with the
contact points just commencing to sep-
arate the vernier adjuster on the third
marking of its scale, secure the body
to the adapter bracket with the nut and
lock washer
with
a plain washer, under
the lock washer.
(n)
Advance the vernier a further 1 divi-
sion, which is equivalent to advancing
t!1eig&i0~4"~~ the
flyhe!
B.T.D.C.
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