Daihatsu F300 Service Manual page 1146

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ENGINE MECHANICAL
CAMSHAFT
The camshaft made of cast iron employs a hollow type so as to achieve the reduction in weight. This sing
camshaft actuates a total of 16 valves; two intake valves and two exhaust valves of each cylinder.
VALVE SPRING
For improved anti-surging characteristics, the valve spring adopts an unequal pitch type.
The valve springs are assembled in such a direction that the side having a painted mark (the side with
greater pitch) may come at the valve rocker arm side.
VALVE ROCKER ARM & VALVE ROCKER SHAFT
The valve rocker shaft made of carbon steel has undergone nitriding treatment.
The valve rocker shaft is bolt-attached to the cylinder head together with the camshaft caps of the cylind
head.
Furthermore, the valve rocker shaft at the intake side is provided with recessed portions so as to accor
modate the spark plug tubes.
When installing the valve rocker shaft, care must be exercised as to its correct installing direction.
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chamfer dimension at the timing belt side is greater than that at the distributor side .
The valve rocker arm employs aluminum alloy. Moreover, high chrome cast iron is provided at its conta
surface with the camshaft so that the durability may be enhanced.
The valve rocker arm comes in four different shapes.
CAMSHAFT TIMING BELT PULLEY
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CRANKSHAFT TIMING BELT PULLEY
Both the camshaft timing belt pulley and crankshaft timing belt pulley are made of sintered alloy.
The camshaft timing belt pulley is driven by the crankshaft timing belt pulley through an RU type cogge
belt. The tension of this timing belt is maintained by means of a belt tensioner.
CRANKSHAFT
The crankshaft employs spheroidal graphite cast iron as the material.
The crankshaft is supported via crankshaft bearings by the five main journals provided in the cylinder blocl
For reduced weight, the crankshaft is a hollow type.
Furthermore, four oalance weights prevents the occurrence of vibrations.
CRANKSHAFT PULLEY
To reduce torsional vibrations, the crankshaft pulley adopts a damper .
The crankshaft pulley is attached to the crankshaft timing belt pulley by means of four bolts.
FLYWHEEL
A flywheel made of cast iron is employed.
The flywheel adopts a thin contour which features excellent heat radiating properties. To provide an adequat
inertia weight, the outer diameter of the flywheel has been made larger.
An oil catch is provided so that the engine oil may flow to the cylinder block. This design prevents the c
from reaching the clutch disc surface in the event that oil leaks out from the crankshaft side through th
flywheel attaching bolts.
The ring gear is shrinkage-fitted onto the outer periphery of the flywheel.
FLYWHEEL/ATTACHING BOLT
The bolt employs a six point type. To prevent these bolts from becoming loose, special care has bee
exercised to achieve the torque stability when tightening them.
In addition, the attaching holes at the crankshaft are of pass-through type. Therefore, the bolts are seale1
by applying sealer to them .
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