WORKSHOP MANUAL - lombardini service

7
Fuel system
Static injection advance tuning
If the injection advance value found does not correspond to the
previously described value, adjust the screw E and repeat the test.
Rotating screw E by ½ turn will change the injection advance by 5°.
If turned clockwise, injection is advanced.
In the opposite direction, injection is delayed.
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Preliminary steps to pump/injector unit delivery balancing test
Closing the oilhole
To perform this test you must remove the rocker arms cover and
close hole 1 with an M 8x1.25 or M 10x1.5 screw (on latest model
engines) not longer than 8 mm. Also remove the copper gasket.
If the camshaft and rocker arms are dry, lubricate them with engine
oil.
Note: If you only want to check the nozzle it is not necessary to
balance the deliveries; provided that when you dismount the
rod you do not loosen adjusting screws 1 and 2 (fig. 160).
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Test head B assembly
Remove fuel pipe A and mount one test head B in its place per
pump/injector.
The test heads complete with pipes are supplied together with
instrument ref. 7104-1460-069.
157 158
Instrument connection
Place the instrument 1, se.no. 7104-1460-127 at least 20 cm above
the pump/injector level.
Connect pipe A (outlet from every instrument test piece) with pipe A
(inlet of every pump/injector) and pipe B (return to the instrument)
with pipe B (outlet from the pump/injector).
Open tap 2 and 3 of each pipe and fill the instrument with diesel.
Start the engine and bring it to 1500 rpm idle running.
Close the fuel supply to the engine from the instrument’s tank using
lever 4 and after 1 minute observe the levels in the test piece.
If a level goes down more than the others it is necessary to decrease
the delivery of the corresponding pump (see below) and vice versa
to increase the delivery if the level increases.
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