Tim~ng the Engine
Fitting the Camwheel.
First
fit
the intermediate wheel.
It
is now necessary to
fit
[he camwheel to the shaft without disturbing
it
or the intermediate wheel. This
is
made possible by aligning one of the three keyways with the camshaft key and the
in line with the teeth on the intermediate wheel.
When aligned press on
[he camwheel (See Fig.
18).
checking the Valve Closing. Turn the crankshaft backwards until the rocker
adjuster clearance
is
nil which should give the point of closing of the valve as
34
degrees after T.D.C.
~h~ opening and closing of the valve can be more accurately determined by clamping
a
D.T.I. in a convenient position and allowing the plunger button to rest on the valve
Any movement of the valve
is
then immediately seen on the clock face.
Another method is to use a feeler gauge. First re-set the rocker adjuster to give a
0.025" (0.60 mm.) clearance. The "nip" on the valve can now be felt by inserting
a
0.005" (0.10 mm.) feeler.
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It
should be appreciated that due to toleranceh in manufacture, wear, etc.,
it
may not
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be possible to obtain the exact degree figures quoted. Points of opening and closing
should be within
3
degrees either way, if the error
is
more, the camwheel must be
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extracted and one of the remaining two keyways tried. Do not forget to mark the
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keyway already tried with an indelible pencil to prevent
it
being accidentally tried
again.
INLET CAMSHAFT TIMING
Repeat the exhaust procedure by fitting the inlet rocker box, timing side push rod
and adjusting the clearance between rocker adjuster and valve to give 0.020"
(0.50 mm.).
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Setting the Crankshaft,
Turn the crankshaft backwards unt~i the exhaust valve
closes and the d~sc readlng
IS
55 degrees after B.D.C.
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Fitting the Carnwheel. Assemble in the same manner as in the exhaust camshaft
procedure.
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Checking Valve Opening. Rotate the engine forward until there
is
no play
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between the rocker adjuster and valve tip when the point of opening should be
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approximately
34
degrees beiore
T.D.C.
(The exhaust valve
is
now open).
Setting the Inlet Camshaft. Rotate the camshaft "ANTI-CLOCKWISE" after all
play between the rocker adjuster pin and valve tip
is
taken up (valve closing).
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As a final check, the drive side cylinder push rods may be fitted and the t~ming of the
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drive side cylinder checked.
If any discrepancy (up to
4
degrees)
is
found between
the two cylinders,
it
shwld be equalised. To do this,
it
will be necessary to remove
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the camwheel and re-select another keyway. When the timing has been corrected,
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insert the new figures in the "Record Table" overleaf, thereby obviating this last
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operation for subsequent assemblies.
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