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10
Fuel system
188
189
190
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191
KD 702_1003_1404 Workshop Manual_cod. ED0053029340_1° ed_ rev. 00
Static injection advance regulation
Fill the tank and operate the fuel pump.
Set the pump/injector delivery control rod (ref. A fig. 187) at half-
stroke.
Bring the piston to the top dead centre of compression. Fit a 13
mm hexagon wrench on the injection advance adjusting screw
lock nut. By turning the wrench forth and back you prime the
injection pump, thus enabling the tester to be drained.
With the piston at its TDC, operate lever 2 (fig. 188) and bring
the drain valve into contact with the piston. Then reset dial
gauge.
Go back ¼ of a turn moving the crankshaft anticlockwise. Then
turn forward again very slowly
observing the fuel level inside the tester. As soon as the level
changes, then stop. You reached the static injection advance.
By actuating lever 2 check piston lowering with respect to the
TDC.
The table on page 90 shows both piston lowering expressed in
mm, with respect to the TDC, and the corresponding rotation of
the crankshaft, expressed in degrees.
The static injection advance in degrees a = 11° to 13° refers to
all engines for adjustments from 1500 / 3600 rpm.
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.
193).
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.
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