Lombardini LDW 702 - Static Injection Timing

COMPILER TECO/ATL
REG. CODE
1-5302-351
MODEL N°
50563
DATE OF ISSUE
04.90
REVISION 04
ENDORSED
DATE
15.11.99
71
FUEL SYSTEM
VI
a
STATIC INJECTION TEST INSTRUMENTATION- EARLY UNIT
INJECTORS
Carefully remove the engine valve cover. With reference to the exploded unit
injector diagram on page 57, remove plug (20). Replace plug(20) with
union(1)- 1460-028.
Install Injection timing tool (2)- 1460-024 onto the 1460-028 union.
NOTE 1: When refitting the plug(20), carefully check the sealing properties
of the plug.
NOTE 2: Later versions of the unit injector are not equipped with the
plug(20). Therefore, static timing adjustments require alternative approaches
than those shown. Please see page 56 for details of the static injection timing
instrumentation for later versions of the FOCS unit injector.
TDC DETERMINATION and STATIC INJECTION TIMING CHECKING
With the static injection timing instrumentation installed as described above,
fit the engine with the timing fixture(1), part no. 1460-048 as shown. The dial
indicator support should be oriented over the engine valve spring cap.
Remove the injection pump rack assembly starting aid spring. Adjust and
secure the injection pump rack at 1/2 stroke.
Rotate the engine until the cylinder being static timed approaches TDC,
compression stroke. Alternately, rotate the crankshaft toward TDC and press
down on the timing fixture lever(2) until minimum dial indicator travel is
established. At minimum dial indicator travel, TDC is established. Zero the
dial indicator at the TDC position.
Insure that a good supply of clean diesel fuel is available to the engine,
preferable from an external fuel tank elevated above the level of the engine.
EARLY UNIT INJECTORS (Ref No’s: 231-2, 235-2, 272o)-With reference to
the upper figure, bleed the injection the injection timing tool by bringing the
engine to such as position as the injection pump is being acted upon via the
camshaft. Alternately rotate the engine back and forth until fuel is injected out
of the injection timing tool and free of air.
Rotate the engine in opposite normal direction approximately 90°. Rotate the
engine in normal direction of rotation until a fuel movement is noted in the
static timing sight glass. Stop rotation IMMEDIATELY upon any notice of fuel
movement. Depress the timing fixture lever and note the dial indicator
reading. Check the corresponding dimension listed in the chart to the left-
determine static injection timing from the chart. Correct, if needed, the
injection timing by turning screw(E)- see next page. Refer to the chart on
page 55 for static timing specifications with respect to the injector reference
number. See the following page for static timing adjustment procedures.
LATE/ INTERMEDIATE UNIT INJECTORS- (6590-272, 6590-285, 6590-
286, 6590-287, 6590-290) Remove the check valve from all injectors, remove
the check valve side o-ring from all injectors, replace the o-ring with special
eccentric gasket supplied within 1460-074. With reference to the lower
diagram, fit the unit injectors with a special tool block(1), bleed fitting(2),
union(3), supply fitting(4) and nylon bleed tube(5) as supplied within 1460-
074. Note: 6590-272 unit injectors do not require the eccentric gaskets
as detailed above but do require a special block(1) as supplied under
part no. 1460-056.
Place a small cup beneath the nylon bleed tube, rotate the engine in the
normal direction of rotation until fuel stops flowing from the bleed tube. At the
very instant of fuel flow stoppage, stop rotating the engine. The fuel flow
stoppage indicates the beginning of injection. Depress the timing fixture lever
and note the dial indicator reading. Check the corresponding dimension listed
in the chart to the left- determine static injection timing from the chart.
Correct, if needed, the injection timing by turning screw(E)- see next page.
Refer to page 64 for the static timing specification with respect to the unit
injector reference number. See the following page for static timing adjust
procedures.
13°
12°
11°
10°
9°
8°
7°
6°
5°
4°
1.022
0.871
0.733
0.606
0.491
0.388
0.297
0.218
0.152
0.097
1.242
1.059
0.891
0.737
0.597
0.472
0.362
0.266
0.185
0.118
LDW 502
(mm)
LDW 602, 903,
1204,1204/T
(mm)
1.296
1.105
0.930
0.769
0.623
0.493
0.378
0.277
0.193
0.123
LDW 702
1003,1404
(mm)