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ASSEMBLY
POWER UNIT
Reassembling Engine
Reassemble the engine in the reverse order of
disassembling with careful attention to the
following points.
(1) Cylinder head and related parts
• Valve stem seal
• There are two kinds of valve stem seals, namely,
the valve stem seal for the intake valve is
identified by the black color while the other for
the exhaust valve is identified by the green color.
• On installing the valve stem seal to the cylinder
head, apply the engine oil for the 4-stroke cycle
engine to the insertion point. For setting the
valve stem seal, press it into the valve gUide with
fingers.
• Intake valve, Exhaust valve
• The intake valve and exhaust valve are different
from each other, namely the intake valve is
identified by the "IN" mark while the exhaust
valve is identified by the "EX" mark.
• Apply the engine oil for the 4-stroke cycle engine
to the valve stem. Then, insert the valve into the
valve guide while twisting it.
• After setting the cotter on-to the valve stem, tap
the valve shaft end with a small plastic hammer
several times for stabilizing the cotter in selting.
• After reassembling the valves, apply the engine
oil for the 4-stroke cycle engine to the upper side
of the retainer and its periphery.
• Cam shaft
• Carefully press the oil pump pin so that it does
not come out of the cam shaft.
• When reassembling the cam shaft to the cylinder
head, apply the engine oil for the 4-stroke cycle
engine to the cam and bearing beforehand and
then insert the cam shaft into the cylinder head
from the oil pump side while twisting it with care
not to turn over the oil seal lip.
• Rocker arm
• Temporarily set the tappet adjusting screw and
tappet adjusting nut to the rocker arm.
Note:
Set the tappet
adjusting
nut with the chamfered
side down .
• Apply the engine oil for the 4-stroke cycle engine
to the rocker arm shaft.
• Set the rocker arm shaft from the side of the oil
pump of the cylinder head. Pay heed to
orientation of the rocker arm shaft so that the
tapped hole side is positioned in the oil pump
side.
• Set the rocker arm shaft spring, washer, rocker
arm, rocker arm shaft collar to the rocker arm
shaft from the bottom side in this order.
• When selting the above-mentioned parts, apply
the engine oil to every part.
Bolt M6·19
Washer 13.2-21.8-2.0
Rocker arm shaft
Rocker ann shaft collar
Aockerarm
~
WES7ERBEKE
Engines & Generators
27
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