coupling can be rotated by use of the starting handle to hring 'each bolt into
a position where the nut may easily be reached.
Having removed all four nuts, take off the valve gear cover and turn the
engine
by
the starting handle until the timing marks on the spiral bevel gears
coincide. 'These will bring the driving
lake
on the cylinder head across the
engine, and the driving yoke on the dynamo parallel to the engine centre
line. The bolts
themselvcs may now be withdrawn, care being taken not to
lose the distance washers, which
must be replaced in the same position.
Removal of the bolts enables the flexible coupling to be withdrawn.
Detach the two cables on the distributor side of th,e dynamo noting from
which terminal they are removed.
Now unscrew the four set screws which attach the dynamo to its platform
at the front of the engine thus releasing the dynamo. Lift the dynamo
approximately a quarter of an inch and tilt it towards the near side of the car
until the driving yoke on the dynamo is just clear of that on the cylinder head.
The dynamo can then be tilted forwards and easily withdrawn.
Replacement of the dynamo is effected in the reverse way, hut it is
necessary to make sure that the engine timing has not been disturbed while
the dynamo was removed. Removal of the rectangular cover plate in the
clutch housing should reveal the timing
mark on the flywheel for Nos.
1
and 4
cylinders, exactly in the centre of the opening. Place the brass packing
pieces which fit under the dynamo
base in position on the dynamo platform,
making sure that you replace the same number that you too!< off. If for any
reason the dynamo is replaced by another, it may be necessary to re-adjust
the mesh of the driving gears to obtain silent running by suitable selection of
the packing shims used. Turn the dynamo spindle until the timing mark
on the dynamo drive gear coincides \vith the centre line of the dynamo and
is at the rear, that is, ready for engagement with the
correspondingly marked
teeth of the drive gear on the crankshaft. The holes in the dynamo coupling
yoke will then be parallel with the engine centre line. Tilting the dynamo
towards the near side of the car and holding the dynamo coupling yoke in
this position, insert the drive gear into the opening of the dynamo platform
and swing the dynamo backwards and downwards into position. 'The gears
can be felt to be meshing
properly
if
the coupling is slightly oscillated as the
dynamo is replaced, but do not overdo the oscillations or you may engage
the wrong teeth.
See that the bolts in the dynamo base are coinciding with the holes in the
dynamo platform, and then observe
if
the dynamo coupling yoke is exactl?~
parallel to the engine centre line. If it is not, withdraw the dynamo, reset
the coupling yoke and re-insert the dynamo. No difficulty should be ex-
perienced in getting the dynamo in position with the correct teeth in mesh,
as the distance between one tooth and the next is sufficient to make an
appreciable difference to the position of the dynamo coupling yoke,
a
differ'ence which is immediately discernible.
Having satisfied yourself that the correct gear teeth are in mesh, replace
the screws in the dynamo base, taking particular care to tighten them up
evenly a partial turn at a time until all are quite tight. Now make a find1
test. The flywheel mark 1-4 should show exactly in the centre of the inspection
PAGE
FORTY-SIX D
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