the oil pump. Thene is a slot in the extension to the oil pump driving gmear
wheel which receives a tongue attached to the spindk driving the High
Tension Distributor. It follows therefore
that if the Distributor is removed
at any time it can only be put back in two ways, one of which is right. This
can be
test,ed by the position of the dynamo coupling in r,elation to top dead
centre of No.
1
cylinder.
It may be necessary at some time to remove the dynamo.
This is a
comparatively simple matter
if
reference is made to Illustration No.
14.
The
front end extension of the crankshaft is fitted with two gears, a helical bevel
and a worm. The helical bevel drives the dynamo, and here again we find
that the necessity for correctly meshing gears, which is taken care of by a
number of interposed thin metal shims. The dynamo gear is attached to the
spindle by means of a bolt and tab washer, the gear being held in position on
the shaft by means of a key. The gears are suitably marked for re-meshing,
but the dynamo cannot be put back wrong
if
No.
1
piston is put on top dead
centre and the coupling on the top of the dynamo placed on so that it points
accurately fore and aft as already described.
The ohject of the shims is to
allow the gears being correctly in mesh.
Figme
14.-Front
III
thr engi~lv, sI111n-ing
~Iw
clyii;~m~~ rtmt~vcd from thc rnginr. Thr
dynamo drive can be seen quitc ckarly and also the worm wheel which
is
fitted to the cr;inltsli;ift
for driving the oil pump and high tension Distributor.
There are three small items which really only concern th'e Repair Shop.
They relate to the removal of the gear wheels from the crankshaft and the
front end housing of the base chamber. After the dynamo has
b,een removed
it is possible to withdraw the worm drive from the crankshaft by tapping it
with a suitably soft tool such as a piece of brass through the dynamo housing.
It is a parallel fit on the crankshaft and is held in position by a key.
Illustration No.
15
shows the necessity of employing a puller to remove
the helical bevel pinion from the crankshaft. Th'e hoks in the pinion are
tapped
:"
R.S.F.
To remove the front end housing it is also necessary to use
a
means of
withdrawal in the form
of
two H.S.F. bolts. These ar'e shown in
Illustration No.
15.
D/I
PAGE
TWENTY-SEVEN
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