92
2A
The governor adjuster device (1) is placed in the gov-
ernor housing end and consists of an electromagnet that
works directly against the injection pump control rod.
The control rod position sensor (2A and 2B) gives the
control unit the opportunity of deciding if current to the
adjuster device should be increased or decreased. The
main speed sensor (3) in the system works against a
toothed gear on the pump camshaft. In addition to the
charge pressure, it is important for the control unit to
know engine speed, otherwise it will not be possible for
the control unit to determine fuel flow.
2B
1
3
Injection timer
Engine DH10A, 345 and 360 have an electrically oper-
ated injection timer. Basically this is the mechanical-
hydraulical timer described in Service Bulletin 2.23.21
11-93 and Service Manual 2 (20–27) Engine THD
101–104.
The difference is that the centrifugally activated con-
trol valves in the rear flange have been removed and,
because of this, the infinite timing setting has been re-
placed by a 2-position timer and the maximum timing
angle has been reduced from 6
°
to 5
°
.
Delivery oil flow from the engine is regulated instead
by a solenoid valve (638), mounted on the timer bear-
ing housing.
The injection timer angle setting is dependent on three
different factors: speed (r/min), temperature (
°
C) and
load (Q).
The information on engine speed and engine load is
obtrained from the EDC-control unit (9058) and the
temperature from the temperature sensor (756B).
A special control unit (3104), placed on the electrical
distributor unit, takes care of the information and con-
trols engagement/disengagement of the solenoid valve
(638) on the injection timer.
