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4-5
GEARCASE COVER
Gearcase cover is made of aluminum alloy die casting and
is
fitted on the reverse side of the flywheel.
This
cover em-
braces the injection pump, timing gear, operating lever and
supports the camshaft as a bearing. To the gear case cover
the tappet guide is fitted and then the tappets are assembled,
(See Fig.
5
.)
4-6
CAMSHAFT
The camshaft is made of forged chrome steel wholly sintered
and then ground. It carries three cams,
viz.
one intake cam,
one exhaust cam, and one fuel injection pump cam, and the
shaft is supported by a ball bearing pressure-fitted
in
the
gear case cover and by the gear case. The camshaft
is
assem
bled inside the gear case cover. To the shaft the relief valve
and a pin are fitted. The pin is used when starting engine by
hand cranking. (See
Fig.
6.)
4-7
TAPPET
and
TAPPET GUIDE
4
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1
TAPPET
Tappet is made
of
forged steel and wholly sintered, ground,
and then taftride finished. The camshaft has
oil
holes for
lubricating tappets.
4-7-2
TAPPET GUIDE
Tappet guide is made
of
aluminum alloy die casting and de-
termines tappet positionsand
is
fitted
to
the gear case cover.
In the crankcase there
is
a blow-by gas hole, which hole goes
through
up till rocker chamber via push rod sleeve.
(See Fig.
6.)
Fig.
5
i
Fig.
6
4-8
ROCKER
ARM
Rocker arm
is
made of forged steel and
is
wholly sintered and then ground, and it
is
supported by the rocker shaft. At the
one end it has valve clearance adjusting screw. With this screw valve clearance
is
adjusted
to
the specified gap and is fixed by
lock nut. Lubrication of the rocker arm
is
carried out by the
oil
splash contained in the blow-by
gas
from the crankcase. In-
take rocker arm has decompression mechanism. (See Fig.
6.)
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