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Fit distribution gear
on crankshaft
and using
a
sc rewdriver
rotate
camshan
CCW until rocker
arm
touches exhaust
valve In
cylinder
head
NO.2
(L/H).
Now
fit
cam
wheelan
camshaft,
locating
the best position to
make slots
in wheel to match
with slots
in
camshaft,
thus making possible
to
insert
dowel
without
moving
crankshaft and cam-
shaft either.
At
the
end of
the
above
operation mark
the
two
teeth
of
cam wheel,
the tooth
of
distribution
gear
engaging same
and also
mark
the slot
in
cam
wheel
in
which the dowel
is inserted
(s~e
A
and
B
on
Fig
.
57)
.
Now,
checkl~g
openi
ng
and
closing
of inlet and exhaust valves by suitable degree
plate,
timing data
should
be
as shown in diagram
on Fig. 51.
St
ill on COLD
ENGINE make
the final adjustment
of tappet
clearance.
Correct clearance is 0.10
mm. (.0039") to inlet and 0.20
mm.
(.0078")
to
exhaust.
Fig. 56
shows details
of
tappets,
rocker arms,
springs, collars, se micones and valves.
N.B.: When carrying out replacement of distri-
bution gear
and cam wheel
w
ithout
remov-
ing
engine from frame and consequent
valve
timing is needed, a suitable special
tool has been provided
for
the
purpose.
Thi
s
tool
enables to transfer exactly the
reference
marks
from old
wheel
and gear
onto the
new
ones. Use it as follows:
remove gear and wheel to be replaced.
insert
dowel of tool
No.
12913800
(see 25 on
Fig. 58)
in
marked cam wheel slot
(the
same
in
which
camshaft dowel
was previously lo-
cated).
undo
bolt
(A)
of above tool and rotate tool
arm
(8)
until notch at end of same comprises
perfectly the two marked teeth.
Then
screw
down bolt (A).
remove tool from wheel to
be replaced
and
apply it to
new
wheel. Insert
1001
dowel
In
each of the
five slots until
notch at
arm's end
(8)
will
comprise perfectly
two teeth
of the
new wheel. Now
mark
with paint
the two teeth
comprised in arm
notch.
and the slot in which
the
tool dowel
is
inserted
.
:!
".
..
... ....
,
..
"0
.
:
Fig.
56
..
, .
.:
.. .. .
.
.
.'
.-
"
"
..
"
It· .. ':'
::
• •• ::H
To mark the equivalent tooth of the new distri-
bution gear, just count exact number
of
teeth
from keyway.
Aner marking
teeth
and dowel slot on
new cam
Fig.
57
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