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and the pump housing should be' of
o.
2 -
o.
7mm, while the clear-
ance. between the back end of the impeller and the bedplate should
be of 0.4-0. 8mm.
7. Electrical System
The electrical system of the model 495 diesel engine i'::cludes
mainly the bettery, staring motor, generator, regulator, instru-
ments and switches, etc. The cable is of single wire syste1l1 with
one pole grounded as shown in Fig. 32.
1). Construction Features of The Electrical System
(1
)Battery
The battery is of Model> 6 - Q - 140, its rated voltage is 12
volts. Each cell of the battery is fitted with 21 pieces of pole plant.
The
battery capacity is 140 amperes.
The _ condition of battery, which affects the engine 'staring di-
rectly, should always be kept will through regular maintenance as
specified.
, (2)Dynamo
:The
model
of 2JF - 200 silicon rectified dynamo of completely
enclosed type is adopted in -the engine. The operating voltage is 14
volts ,the output current is 13· amperes and the- rated capacity is-
180 watts. The silicon rectified generator is a set of small. size ,sim'-
pIe constructioQ and good charging
performan~e
at low
speed·,~tc
. . .
The -magnetic 'poles of the generator are located on the rotor
and the exciting current is conducted to the magnetic field coil
through two slip rings.
,-;'~
The 3 - phase windings are located on the stator and the cur- -
rent from the windings is turned into DC and conducted out after
being rectified by two groups of silicon diodes (there are 3 diodes
in each group ) in the rectifyin-g device.
74
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