Lombardini LDA 422, Руководство по ремонту

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69
REG. CODE
1-5302-596
MODEL N°
50881
DATE OF ISSUE
15-05-2003
REVISION
00
DATE
15-05-2003
ENDORSED COMPILER TECO/ATI
270
271
272
IX DISASSEMBLY/REASSEMBLY
Description of the injection advance regulator
When starting, and at a low idling speed the correct value of injection
advance is 11° before P.M.S..
This value increases in accordance with the engine RPM, attains 24° at
3500 R.P.M., then renains constant.
The advance variation is obtained through the injection advance regulator,
see fig. 270.
It consists of the flange
A splined to the camshaft and the carrier, both
with the fulcrum on two pins, of the centrifugal weights C ; of a counterflange
F , integral with the injection cam and free to rotate on the camshaft, on
which two slots are made where the pins D connected to the centrifugal
weights slide.
Appropriate springs
B are applied between the centrifugal weights C and
the flange A .
With the engine stopped and at low idling speed the spring load is higher
than the weights centrifugal force, therefore they remain closed, see fig.
271.
When the RPM increases, the centrifugal weights force becomes higher
than the spring load, the weights move and through the pins
D engaged
into the slots rotating the injection cam.
At 3500 R.P.M. the weights are completely open, see fig. 272 and the
injection advance is 24° before P.M.S.