Injection Pump
The injection pump is a flange-mounted in-line pump
which is located on the engine block. The pump is
driven by cams on the engine camshaft, that operate
the pump chambers directly.
The
injection
pump has the same number of pump pis-
tons as the engine has cylinders.
Centrifugal Regulator
The governor is mechanical and works with speed-
sensitive governor weighs. It is mounted on the front
of the camshaft drive.
The governor weights operate the injector pump con-
trol rod via the governor sleeve, a lever and a governor
arm. Engine speed is governed throughout the entire
range, from low idle to high idle (all-speed type).
Injectors
The engine is provided with pintle-type injectors. Each
injector basically consists of a nozzle retainer and a
nozzle.
When the fuel pressure increases to the set value
(opening pressure) the injector needle, which is held
pressed against its seat by the compression spring, is
lifted and atomized fuel is injected into the precombus-
tion chamber of the engine.
Injector opening pressure is determined by the com-
pression spring which is adjustable with shims.
1 Injector nut
2 Injectors
3
Joining piece
4 Compression screw
5 Spring
6 Adjustment shims
7 Injector holder
8 Washer
9 Nut
20-0 Engine Information, General
42 47701798 05-2013 © AB VOLVO PENTA
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