Gearcase Cover; Camshaft; Tappet And Tappet Guide; Rocker Arm - Robin America DY30 Service Manual

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
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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 A R M
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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