Yanmar 4LHA-HTP Operation Manual page 431

Chapters Fuel Injection Equipment
1. Fuel Supply System
(4M2) Boost compensator
(4)-(2)-(1) Objective of compensator
The boost compensator is a device mounted to the fuel
injection p u m p for engines equipped with a turbocharger.
The amount of air sent from the intake manifold by the
linking function of the turbocharger increase in proportion
to the a m o u n t of fuel injected from the injection pump
( 4 L H A - D T E ) The boost compensator controls the
injection quantity by responding to changes in pressure.
Engine stop nob
Acceleration adjusting screw
(4)-(2H2) Outline of structure and principle of operation
1 When the regulator handle is operated during abrupt ac-
celeration, the control rack moves to the increase side as
far as A.
2 Increase of engine speed drive the turbocharger to in-
crease boosting pressure. This boosting pressure pushes
the diaphram in the boost compensator, moving the con-
trol rack to the fuel increase side by means of the boost
compensator lever.
Cold start knob
/ Boost compensator \
\ cancel knob
at cold start
Diaphragm Stop lever^
Adjust bolt
3-2-9
4LHA Seru
/
when r u n n i n g
<$=> F.O-increase
F.O-decreasi
j "jT} iTi Tension adjust leve