11
17
A. A mechanical all speed governor is used. It is
housed in the gear case.
A flyweight assembly is mounted on the
camshaft. The movement of the flyweight is
transmitted to the injection pump control rack
by way of the slider, control lever and link. A
spring which is hooked to the arm and tension
lever regulates the movement of the flyweight.
By changing the set angle of the governor lever,
tension on this spring is changed. Thus, the
engine speed can be regulated by the governor
lever.
B. Maximum speed set bolt.
Set bolt is mounted on the cylinder block. This
bolt limits the movement of the arm and has
been adjusted and sealed at the factory.
C. Max. fuel and start spring.
These are built into the cylinder block, to regu-
late fuel injection at high speed. Regulation of
fuel injection in the middle speed range is by
torque spring to realize higher torque.
A start spring is placed between the gear case
and link. This spring automatically functions to
increase fuel during the start mode.
An idling spring at the gear case stabilizes
engine idling speed.
The max. fuel has been adjusted at the factory
and sealed.
Nozzle and Holder -
Specification
Item
Perama M25/M30/103-09/103-10
103-06
Part code
131406330
131406340
Assembly number
093500-3320
093500-2240
Nozzle holder
093100-3320
(ND-KCA46SD332)
093100-2240
Nozzle
093400-1460
(ND-DN4SDND146)
093400-5010
(ND-4PDI)
Nozzle type
Throttle type Throttle type
Needle valve diameter
6mm
3.5mm
Pintle diameter
1mm
Valve opening pressure
115-125kg/cm
2
(111-121 ats)
115-125kg/cm
2
Spraying angle
4° 4°
Construction/Function
A. The nozzle has been machined to inject fuel,
which is pressure-fed from the injection pump
to the combustion chamber. Fuel is pressure-fed
from the oil hole of the nozzle holder to the
nozzle body and sprayed from the nozzle
compressing the spring when the pressure
exceeds the specified value. Some fuel lubri-
cates and cools the nozzle and nozzle body,
and
returns via the return pipe.
Valve closed
Valve open
Full opening
(main jet)
6
M
,
q
L7111
1
1Y
-
Disassembly/Inspection
A. Place the nozzle holder (body) in a vice and turn
the nozzle nut to disassemble.
NOTE: Care should be taken so that the needle
valve does not fall when the nozzle is removed.
B. Wash the nozzle body and needle valve and
inspect the nozzle for seizure, sticking and fuel
leakage on the seat surface. If fuel leakage is
detected, replace the nozzle.
C. Inspect the upper and lower contact surfaces of
the distance piece and correct so that positive
contact can be obtained.
D. Check the nozzle needle valve-contact surface
on the push rod for wear, and spring seat for
cracks.
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