6. Fuel Injection equipment
231
4) Boost compensator
a) The boost compensator stopper (abbreviated to "boocon") is a device which increases the
injection quantity when the air quantity (turbocharging boost) supplied to the suction manifold is
increased.
b) The boocon is installed on the top of the injection pump governor. There is a diaphragm in an
upper part of the boocon and the boost pressure is applied to the upper part with this diaphragm
as the boundary. A boocon spring with a setting force is installed under the diaphragm. An
adjusting pin is directly connected to the diaphragm so that it will move in conjunction with the
diaphragm. A specified amount of lubricant necessary for sliding is stored at the bottom of the
adjusting pin.
c) The tension lever in the injection pump is drawn to the right by the governor spring. This motion
causes the boocon lever to rotate counterclockwise round the supporting point A to push the
connecting pin against the taper of the adjusting pin. Therefore, when the adjusting pin moves
downward or upward through the diaphragm, this movement is transferred to the connecting pin
boocon lever tension lever, so that the control sleeve position (injection quantity) can be changed
directly.
d) For the boocon, the set value cannot be changed.
Note:
The description above is given based on the service manual issued by the Service Department
of Bosh.
Boocon
Boocon spring
Boocon lever
Supporting point A
Diaphragm
Connecting pin
Governor spring
Flyweight
Plunger
Control sleeve
Tension lever
Adjusting pin
Boost pressure inlet
010349-00E
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